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  • Home
  • Members
    • Alumni
  • Calendar
  • Events
    • Lectures >
      • Industry Perspective Lectures
      • IPS Lectures
      • Student Lectures
      • Alumni Lectures
      • OSA Lectures
    • Outreach Events
    • Women in Photonics Week >
      • WIPW 2019
      • WiPW 2018
      • WiPW 2017
      • WiPW 2016
    • Light Science Workshop >
      • Light Science 2018
      • Light Science 2017
    • Day of Light >
      • Day of Light 2019
      • 2015 Symposium
    • Banquet >
      • Banquet 2024
      • Banquet 2022
      • Banquet 2019
      • Banquet 2016
      • Banquet 2014
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    • Social Events
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  • Education
    • Education Home
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      • Light-Pipes: Controlling Light
      • DIY Holograms
      • Color Mixing
      • LaserComm
      • Fluorescence
    • Classes
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    • Outreach Kits 2020
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Student Lecture Oct 28 - KaiKai Liu and Jake Ewing

10/23/2021

 
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Join us at Henley Hall 1010 on 10/28 at 1pm! Free Pizza Provided! 

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Jake Ewing
DenBaars Group
Materials Dept, UCSB
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MicroLEDs for next-generation display technologies

Micro light-emitting diodes (µLEDs) are promising candidate many next-generation displays technologies including television screens and augmented reality (AR) glasses. Advantages of µLEDs include high efficiencies, self-emissivity, high brightness and long operating lifetimes. Current research focuses on improving growth methods and processing of µLEDs to achieve size-independent efficiency across the entire color spectrum. This talk will provide an overview of the progress of µLED technology as well as current research being conducted at UCSB

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KaiKai Liu
Blumenthal Group
ECE Dept, UCSB

Photonic integrated coil resonator for laser stabilization with ultra-low thermodynamic noise limit

Stable lasers and reference cavities provide the frequency standards and precision measurement references and are an essential component in a wide range of applications including coherent communications, atomic and optical clocks, and quantum communications and computation. On-chip laser frequency reference cavities have been drawing attention and interests, as on-chip optical ultra-low loss waveguide resonators are able to achieve Q factors above 100 Million.
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In this talk, I will introduce the landscape of table-top stable lasers and bulk optical reference cavities and move on to our recent progress towards on-chip ultra-high Q reference resonator and the resonator design and engineering to mitigate the thermodynamically driven noise. We demonstrate the stabilized laser reaches the resonator intrinsic thermorefractive noise limit.

Dr. Julia Majors - Master Oscillator Packaging for the Laser Interferometer Space Antenna (LISA)

7/8/2021

 
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Dr. Julia Majors

Optical Program Manager
​
Avo Photonics, Inc.


Thursday, July 15, 10:00 - 11:00 am (PDT)
5 years after the earth-based gravitational wave observatory, LIGO, made its first detection of gravitational waves, work is already well underway in preparing for the next generation of gravitational wave observatories – in orbit around the sun. Working with NASA Goddard Space Flight Center, we are building what will be the “quietest” oscillator in (and above) the world to serve as the core light source for the interferometric system. The system is based on a non-planar ring oscillator (NPRO) model, which I will discuss along with some of the challenges that arise when developing laser systems for space applications.

Student Lecture by KaiKai Liu on Milliwatt Threshold 0.5-Hz Linewidth Si3N4 Brillouin Laser

5/25/2021

 
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Friday May 28 at 1:00 pm 
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KaiKai Liu
Blumenthal Group
ECE Dept, UCSB

Milliwatt Threshold 0.5-Hz Linewidth Photonic Integrated Si3N4 Brillouin Laser

Narrow linewidth lasers are an essential component in a wide range of applications including coherent communications, atomic and optical clocks, and quantum communications and computation. Laser cavity Q factor plays the crucial role in semiconductor laser linewidth. Ultra-low loss SiN waveguide resonators are extremely advantageous for making Hz linewidth lasers.
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In this talk, I will introduce the unique linewidth property of Brillouin lasers and present our recent progress towards Billion Q photonics integrated SiN waveguide resonators and the demonstration of the milliwatt threshold Brillouin laser with 0.5 Hz Schawlow-Townes linewidth.

Quantum Industry Showcase 2021

4/26/2021

 
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The UCSB Quantum Foundry and the UCSB Photonics Society hosted the 2021 Quantum Industry Showcase on April 22 and 23. You can watch the Keynote address and the fireside chat below.  You can also find more information and presentations from the event at ​https://qis.quantumfoundry.ucsb.edu/. 
Like these videos? Watch the full QIS 2021 playlist at 
https://www.youtube.com/watch?v=xulQc4G_R9w&list=PLtIKDPzlP_wMvxVLMWlnP-lP6kb7Lr29l

Student Lectures - Shubhra Pasayat and Chris Zollner

3/16/2021

 
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1:00 PM Friday, April 2nd

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Shubhra S. Pasayat
Mishra group 
ECE Dept, UCSB

III-Nitride Strain relaxation enabled by Porous GaN for optoelectronic applications 

In my talk, I will discuss the conceptualization, fabrication and optimization of the strain relaxed substrates followed by process optimizations which led to our demonstration of world’s first <10 µm sized red LED with measurable efficiency.

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Chris Zollner
Nakamura group 
 Materials Dept, UCSB

Ultraviolet LEDs for disinfection applications: efficiency bottlenecks and novel approaches  ​

In this talk, I will discuss why III-nitride based deep-UV LEDs remain less than 10% efficient, whereas blue and white GaN LEDs are now well over 60%. Next, I will summarize our approach to improving UV LED efficiency using improved material quality, device design, and fabrication technologies. Finally, I will suggest some possible future trends, and what it will take for UV LEDs to become the dominant UV light source.

Infrared Applications for Safe and Healthy Living - Dr. Perera

1/26/2021

 
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​​Dr. Unil Perera
Regents’ Professor of Physics
Georgia State University


Friday, January 29th, 10 am (PST) 
​Infrared detectors and imaging systems are becoming increasingly important in a diverse range of astronomic, military, and civilian applications. This field has gained significant attention while incorporating various materials and architectures into detector designs with a strong focus on applicability into clinical domains. Dr. Perera will discuss recent detector structures, and his latest work on disease detection. Biomedical applications of infrared include an exploration of an Affordable, Sensitive, Specific, User-friendly, Rapid, Equipment-free, and Deliverable (ASSURED) diagnostic regimen and testing its clinical feasibility for inflammatory bowel diseases (IBDs) and cancer screening. A study using Fourier transform infrared (FTIR) spectroscopy in attenuated total reflectance (ATR) sampling mode analyzed  body fluids in order to identify reproducible,  stable,  and statistically significant differences  in spectral signatures of the IR absorbance spectra between the control and disease samples. These results show that serum samples can be used to detect the biochemical changes induced by these diseases. 
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Image from https://doi.org/10.1038/s41598-017-17027-4
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Image from https://doi.org/10.1038/s41598-017-17027-4
​Student’s t-test (two-tailed unequal variance) p-values of absorbance. Discriminatory region for lymphoma with higher significance (p < 0.05) are amide I of protein, amide II of protein, C-H bends of CH3/CH2 groups in α- and β- anomers, asymmetric phosphate I, and carbohydrates with predominant contributions nucleic acids (DNA/RNA via PO2 − stretches). Discriminatory regions of melanoma are amide I and carbohydrates with predominant contributions of nucleic acids.
Plots of the protein secondary structures (α-helix, β-sheet) and their ratio. (a) Quantified integral (area covered) values of α-helix components are less for tumorous cases compared to control. (b) Integral values of β-sheet components are higher for tumorous cases compared to control

Student Lecture Series - January 22, 2021

1/20/2021

 
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1:00 PM Friday, January 22nd
Zoom Meeting --– Meeting ID: 847 3105 9791 --- Password: 792878  --- Zoom Link


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Yahya Mohtashami
​Schuller group
ECE
Dept, UCSB



​Light-Emitting
Metasurfaces

In this talk, we show that we can increase the light extraction efficiency of, impart directionality upon, collimate, and focus the spontaneous emission from InGaN/GaN quantum wells, using phased-array metasurfaces.

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Seamus O’Hara
Sherwin group
Physics
Dept, UCSB



​Optical Sensitivity to Wavefunctions of Electron-Hole Pairs in Semiconductors
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Strong THz laser fields can explore non-linear, non-equilibrium phenomena in matter. The talk will focus on photons emitted by electron/hole re-collisions, and how the polarization of these photons carries information about the semiconductor.

Dr. Christian Reimer - From Academia to Co-founding HyperLight -- Developing Integrated Lithium Niobate Technologies for High-performance Photonic Solutions

10/22/2020

 
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Dr. Christian Reimer

Head of Product

HyperLight Corporation


Friday, October 23rd, 11 am (PDT) via Zoom
Dr. Christian Reimer is a physicist and entrepreneur working in the fields of nonlinear optics, integrated photonics and quantum optics. He received graduate degrees from the Karlsruhe Institute of Technology in Germany, Heriot-Watt University in Scotland, and the National Institute of Scientific Research in Canada. He then worked as a postdoctoral fellow at Harvard University, before becoming Co-Founder and Head of Product of HyperLight Corporation. HyperLight, a Venture-Capital funded start-up out of Harvard University, is specialized on integrated lithium niobate technologies for ultra-high performance photonic solutions.
​

In the scientific part of his talk, Christian will introduce the field of integrated photonics based on thin-film lithium niobate, with a  focus on electro-optic applications, as well as recent progress on transforming the field from chip-based proof-of-concept realizations for wafer-scale production. In the professional development section, he will then share his experience transitioning from academia to a start-up company. He will talk about differences and similarities in the work environment, what to expect in terms of tasks and responsibilities, and explain how salaries at start-ups can include combinations of equity and incentives.
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Images from hyperlightcorp.com

Prof. Bowers on Henley Hall

10/9/2020

 
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On ​Henley Hall

Prof. John Bowers
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Friday, Oct. 16th, 4 pm (PDT) via Zoom  
​Henley Hall will hold state-of-the-art research facilities for developing energy-efficient technologies. Prof. Bowers will present the research capabilities and expected research ramp-up timeline for the new building.

High-Dimensional Frequency Domain Quantum Photonics

10/1/2020

 
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​Prof. Andrew M. Weiner

Electrical and Computer Engineering
​
Purdue University

​

Thursday, Oct. 8, 1-2 pm (PDT) via Zoom
Meeting ID: 819 4601 6935, Password: 597044
Entanglement and encoding in discrete frequency bins – a quantum analogue of wavelength-division multiplexing – represents a relatively new degree of freedom for quantum information with photons. Potential advantages include generation of high-dimensional units of quantum information called qudits, which can carry multiple qubits per photon; robust transmission over fiber; frequency parallelism and routing; and compatibility with on-chip implementations, as well as hyperentanglement with other photonic degrees of freedom. In this talk I first give an overview of manipulating and measuring quantum states encoded and entangled in the photonic frequency degree of freedom. I will then discuss our recent experiments that focus on high-dimensional entanglement and mixing of multiple frequency bins in a single operation, going well beyond nearest neighbor “interactions.

Ultraviolet Optoelectronics for a Better Living - Prof. Mi

8/1/2020

 
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Prof. Zetian Mi
University of Michigan, Ann Arbor

Tuesday, September 8th, 10 am (PDT) via Zoom
Meeting ID: 978 3569 2970  Passcode: 468555

Infectious diseases and water are some of the greatest, most urgent challenges of the 21st century. III-nitride ultraviolet (UV) light sources, including light emitting diodes (LEDs) and lasers, are the only alternative technology to replace conventional power-hungry, hazardous mercury lamps for disinfection and water purification. Recent studies showed that AlGaN-based UV-C LEDs can readily shred genetic material of viruses and bacterial and achieve 99.9% sterilization of SARS-COV-2. In this talk, I will present the recent advances of AlGaN and BN nanostructures and heterostructures and their applications in UV optoelectronics, including the first demonstration of mid and deep UV laser diodes and tunnel junction UV-C LEDs with significantly improved performance. The recent development of far-UV-C LEDs, in the wavelength range of 207-222 nm, will also be presented, which has shown to be faster and far more effective than traditional UV-C light (~265 nm) in preventing the transmission of microbial diseases, while causing virtually no harm to mammalian skin or eye.

Student Lecture Series - June 3, 2020 - Changyun Yoo

5/29/2020

 
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Changyun Yoo
Sherwin group
Physics Dept, UCSB
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Schematic for the cross-section of a TACIT mixer (right); Optical image of a TACIT mixer with an SEM image of the active region (top)

​Terahertz Heterodyne Detector Based on the Intersubband Transition of a GaAs/AlGaAs Quantum Well 

We are developing a new type of THz heterodyne detector based on a high-mobility 2-dimensional electron gas (2DEG) in a GaAs/AlGaAs quantum well for spectroscopic applications in deep-space and planetary missions. ​Named as Tunable Antenna-Coupled Intersubband Terahertz (TACIT) mixer, the detector is a four-terminal hot-electron bolometer (HEB) mixer that uses intersubband transition for efficient absorption of THz radiation in a 2DEG. The dual gate structure of TACIT mixers, necessary for the precise control of the intersubband absorption characteristics, enables a high coupling efficiency at THz frequencies and tunability in the detection frequency, but also poses challenges in the fabrication, modelling, and operation of the device.
In this talk, I will discuss our recent experimental results with a prototype TACIT mixer that we have fabricated with a flip-chip process that enables dual-side processing of a sub-micron thick quantum well membrane.
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Sustainable Networking & Adventures in Professional Development

5/18/2020

 
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​Dr. Christina Willis
2019-2020 OSA & SPIE Arthur H. Guenther Congressional Fellow


​Wednesday, May 20, 2020, 1 p.m. 
​Sustainability applied to networking is about treating professional support and assistance like a resource, and creating more of it than you take. Dr. Willis will discuss principles and applications of sustainable professional networking, and how to use it to generate success through mutually beneficial professional relationships. She will also discuss her own career path, citing examples that illustrate the value of sustainable networking.

Quantum Nanophotonics with Hexagonal Boron Nitride

4/24/2020

 
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​Quantum Nanophotonics with
Hexagonal Boron Nitride


​Prof. Igor Aharonovitch
University of Technology Sydney


Engineering robust solid-state quantum systems is amongst the most pressing challenges to realize scalable quantum photonic circuitry. While several 3D systems (such as diamond or silicon carbide) have been thoroughly studied, solid state emitters in two dimensional (2D) materials are still in their infancy. In this presentation I will discuss single defects in an emerging 2D material – hexagonal boron nitride (hBN), that is promising as qubits for quantum photonic applications. In particular, I will focus on ways to engineer these defects deterministically using either chemical vapour deposition growth or ion implantation, and show results on strain tuning of these ultra-bright quantum emitters. I will then highlight promising avenues to integrate the single defects with photonic cavities, as a first step towards integrated quantum photonics with 2D materials. I will summarize by outlining challenges and promising directions in the field of quantum emitters and nanophotonics with 2D materials.
Watch the recorded lecture from April 23, 2020:

Student Lecture Series: Feb. 21st 2020

2/19/2020

 
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12:00 - 1:00 PM Friday, February 21st in Engineering II 3519


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Haojun Zhang
​DenBaars group
ECE Dept, UCSB

Distributed feedback (DFB) laser diodes on GaN

I will first talk about the recent work on blue III-Nitride LDs grown on semipolar GaN substrates. Then I will analyze the main hurdles that impeded its performance, focusing on improving the operating voltage, lifetime and mode quality, and discuss the efforts and approaches to further improve the efficiency and high-speed performance.

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Changyun Yoo
Sherwin group
Physics Dept, UCSB

Terahertz Heterodyne Detector Based on the Intersubband Transition of a GaAs/AlGaAs Quantum Well ​

We are developing a new type of THz heterodyne detector based on a high-mobility 2DEG in a GaAs/AlGaAs quantum well for spectroscopic applications in deep-space and planetary missions. Named as Tunable Antenna-Coupled Intersubband Terahertz (TACIT) mixer, the detector uses intersubband transition for efficient absorption of THz radiation in a 2DEG. The dual gate structure of TACIT mixers, necessary for the precise control of the intersubband absorption characteristics, enables a high coupling efficiency at THz frequencies and tunability in the detection frequency, but also poses challenges in the fabrication, modelling, and operation of the device. In this talk, I will discuss our recent experimental results with a prototype TACIT mixer that we have fabricated with a flip-chip process that enables dual-side processing of a sub-micron thick quantum well membrane.

Student Lecture Series: Feb. 14th 2020

2/12/2020

 
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Friday, Feb 14th from 12:00 - 1:00 pm in Elings 1601


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Takako Hirokawa
Schow group
ECE Dept, UCSB

Ring-Assisted Mach-Zehnder Interferometer Switch with Multiple Rings per Switch Element

Wavelength-selective switches have been propsed for datacenter use to help meet ever-increasing traffic demands. We present a 4-port silicon photonic ring-assisted Mach-Zehnder interferometer (RAMZI) switch, fabricated in the AIM Photonics process, with multiple-sized rings per switching element in a Benes network configuration to reduce the number of electrical pads required compared to a crossbar switch. Another advantage the RAMZI switch has over the crossbar switch is that the loss through the switch is not path-dependent due to its balanced path configuration. Finally, we present results from the fabricated switch co-packaged with a custom driver for control and discuss the outlook for further scaling of the switch architecture. 

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Caroline Reilly 
DenBaars Group
Materials Dept, UCSB

Characterization of InGaN quatum dots grown by metal organic chemical vapor deposition (MOCVD)

InGaN quantum dots were grown by metal organic chemical vapor deposition and shown to exhibit a bimodal size distribution. Atom probe tomography was used to characterize the dots in conjunction with atomic force microscopy (AFM), photoluminescence (PL), and x-ray diffraction (XRD). Small dots with low indium contents were found to coexist with larger, very high indium composition dots. The dots showed abrupt interfaces with the surrounding GaN, verifying the ability to cap the dots without causing intermixing for extremely high indium content dots. 

Advanced Semiconductor Lasers - Dr. Shinji Matsuo

2/5/2020

 
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Advanced Semiconductor Lasers: Ultra-low Operating Energy and Hetergeneous Integration with Si Photonics Devices



Dr. Shinij Matsuo​
NTT Device Technology Laboratories


Friday, February 7th from 12:00 - 1:00 pm in ESB 2001 
The electrical power consumed in data transmission systems is now hampering efforts to further increase speed and capacity at various scales, ranging from data centers to microprocessors. Optical interconnects employing ultra-low-energy directly-modulated lasers will play a key role in reducing the power consumption. Since a laser's operating energy is proportional to the size of its active volume, developing high-performance laser with a small cavity is important. For this purpose, we have developed DFB and photonic crystal (PhC) lasers, in which active regions are buried with an InP layer. Thanks to the reduction of cavity size and the increase in optical confinement factor, we have achieved an extremely small operating energy of 4.4 fJ/bit by employing a wavelength-scale PhC cavity. Cost reduction is also an important issue because a larger number of transmitters are required for short-distance optical links. For this purpose, Si photonics technology is expected to be a potential solution because it can provide large-scale photonic integrated circuits (PICs). Therefore, heterogeneous integration of III-V compound semiconductors and Si has attracted much attention. To fabricate these devices, we have developed wafer-scale fabrication  that employs regrowth of III-V compound semiconductors on directly-bonded thin InP templates on an SiO2/Si substrate. 
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Dr. Matsuo discusses some of the equations related to semiconductor lasers.

Nanoscale Engineered Silicon Imagers

1/28/2020

 
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Nanoscale Engineered Silicon Imagers Reaching Theoretical Limit of Performance and their Applications in Space Exploration and Synergistic Fields
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Dr. Shouleh Nikzad
NASA Jet Propulsion Laboratory


Thursday, January 30th, 11 am, Elings 1605
​NASA’s trend toward less costly missions has created a need for smaller and more capable instruments for in situ planetary applications, space weather, and Earth Observations. The rise of cubesats has created a new powerful platform that if enabled with powerful sensing technology can be an instrument of discovery. At the same time, large aperture UV/visible/Near Infrared space telescope are being planned for cosmology and astrophysics studies that will need high performance yet affordable detectors to populate their very large focal plane arrays. In nearly all these facets of space exploration, there is a strong need for high signal to noise ultraviolet detection technology. This is due to the fact that the ultraviolet part of the spectrum is rich in spectral information that are key to study exo-solar planets, protoplanets, intergalactic medium, supernovae, electromagnetic counterpart of gravitational wave, star formation, galaxy evolution, and more. Semiconductor detectors offer a rich spectral range, tailorable spectral response, high resolution, and sensitivity; however, these capabilities are not available in a single material or class of material. For example, while silicon imagers have reached high performance levels in format, pixel size, and signal to noise, they are naturally insensitive to ultraviolet light. Using non-equilibrium processes, we can manipulate materials at nanometer scale, form unusual and quantum structures, and alter bandstructures. Through nanoscale surface and interface engineering of 2D doping (superlattice doping and delta doping) high performance silicon-based imagers are produced with record high quantum efficiency in the ultraviolet. Furthermore, the response of silicon imagers can be tailored for out of band rejection through nano-scale interface engineering. In this talk we will discuss the underlying physics of the ultraviolet silicon detectors, their performance, their integration in systems, and their application in cubesats and space flagship missions. We will also discuss the synergy between the requirements for instruments in NASA space applications and medical applications and show how space technologies can and have been used for medical applications.
Coffee provided!
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Dr. Nikzad introduces here work at NASA on Si-based UV detectors applications on cubesats.

Student Lecture Series: January 24th 2020 - Jared Kearns

1/22/2020

 
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Blue Semipolar III-Nitride Vertical-Cavity Surface-Emitting Lasers

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Jared Kearns
Nakamura Group
​Materials Dept, UCSB
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​Blue semipolar (20-2-1) vertical-cavity surface-emitting lasers with ion-implanted apertures and buried tunnel junction apertures (BTJ) are fabricated and compared to show that the BTJ's reduced absorption improves device performance. The effect of changing the out-coupling mirror reflectivity is calculated to project the potential of these devices with minor structural changes. 
Friday, January 24th | 12:00 pm | ESB 2001
Pizza will be provided!

Live Stream of Photonics Online Meetup (POM)

1/9/2020

 
Come and mingle for any sessions during the first all-online photonics conference, the Photonics Online Meetup (POM). The event will be continuously live-streamed between 11am and 4pm in Elings 1605. Refreshments will be served.
The conference will feature internationally renowned scientists as plenary speakers:
  • Prof. Mete Atature (University of Cambridge, UK)
  • Prof. Nader Engheta (University of Pennsylvania, USA)
  • Prof. Mercedeh Khajavikhan (CREOL-University of Central Florida, USA)
The complete program can be found here:
https://sites.usc.edu/pom/program/
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