NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.
Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Jasper A. Drisko, Ari D. Feldman, Franklyn J. Quinlan, James C. Booth, Nathan D. Orloff, Christian J. Long
Abstract
Light has been widely used to control a variety of microwave devices, including switches, antennas, and detectors. Here, we present a photoconductive device integrated into a coplanar waveguide to tune complex impedances at microwave frequencies with applied light. We measured the direct-current current-voltage characteristics of the device as a function of the applied light intensity and fit the behavior to a known model. We also measured the frequency dependent scattering parameters and extracted the device impedances in a Pi-network model. We show wide impedance tunability over the entire frequency range investigated and develop a circuit model to fit the frequency-dependent impedances. This simple device has applications in microwave electronics, microwave metrology, and multi-state calibrations.
Drisko, J.
, Feldman, A.
, Quinlan, F.
, Booth, J.
, Orloff, N.
and Long, C.
(2019),
Impedance tuning with photoconductors to 40 GHz, IEEE Microwave and Wireless Components Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925456
(Accessed October 9, 2025)