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  • Home
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    • Lectures >
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      • WIPW 2019
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  • Education
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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 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.

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    Thorlabs designs and produces a variety of optomechanical and optoelectronic components in 15 facilities around the globe. Thorlabs seeks to listen and serve its customers with over 20,000 products available. ​
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    Founded in 2018, Nexus Photonics has developed integrated photonics ready to scale. Smaller, lighter and faster, their platform outperforms industry benchmarks, and operates in an ultra-broadband wavelength range from ultraviolet to infrared to support a wide breadth of practical applications.

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