Thursday, November 18th, 11 am (PST) in Henley Hall 1010
Pizza will be provided!
Cutting edge diode lasers and PICs for sensing applications
Over the past several years, many new application areas for photonics in optical sensing have opened up. In this talk, we will review record performance diode laser and PIC technology developed by Freedom Photonics for a variety of optical sensing applications - gas sensing, atomic sensing and LIDAR.
Basic skills for a good technical team leader
Many engineers with advanced degrees end up leading high-impact technical teams, in pursuit of research, development or production. In this talk, we will discuss various practical issues related to being a good team leader.
Join us at Henley Hall 1010 on 10/28 at 1pm! Free Pizza Provided!
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.
Friday May 28 at 1:00 pm
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
1:00 PM Friday, April 2nd
Breaking the Bounds of Imaging in Label-Free Nanoscopy, Micro-Endoscopy and Ophthalmology - Dr. Zalevsky
Thursday, February 25th, 10 am (PST) via Zoom
Meeting ID: 854 2977 2482 Passcode: 230903
Both human vision and imaging systems have limited capability to separate spatial features, and this information can only be extracted from a limited range in depth. These limitations arise from diffraction, i.e., the finite dimensions of the imaging optics and the geometry of the sensor. In this talk, I will present novel photonic approaches to exceed the resolution limitations of geometric optics. I will show how those concepts can be adapted to micro endoscopy as well as to microscopy-related configurations, including ophthalmic devices for correcting visual deficiencies.
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.
1:00 PM Friday, January 22nd
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.
Following the technical talk, I will give a short professional development talk, including networking and volunteering in the photonics community, and I will cover some career advice for graduate students.
Dr. Christian Reimer - From Academia to Co-founding HyperLight -- Developing Integrated Lithium Niobate Technologies for 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.
Meeting ID: 819 4601 6935, Password: 597044
Meeting ID: 978 3569 2970 Passcode: 468555
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.