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Modulation and frequency response of GDDs in the millimeter wave/THz region
Date
2015-09-22
Author
Alasgarzade, N.
Takan, T.
Uzun Kaymak, İlker Ümit
ŞAHİN, ASAF BEHZAT
Altan, Hakan
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This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
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New methods are being developed for efficient detection of terahertz waves. While many detection techniques show promise their commercial development is still limited due to the overall complexity and cost of the imaging system. Using commercially available neon indicator lamps the interaction mechanism between the glow plasma and the millimeter / THz wave is investigated in detail as a function of the device speed, sensitivity to frequency and polarization of the light. A lock-in amplifier was used to measure the response up to 90kHz when the GDD was placed at the focus of a 113GHz center frequency reconfigured Dielectric Resonating Oscillator (DRO) driven multiplied Schottky diode source. In addition the polarization sensitivity of the GDD was tested for two different scenarios whereby rotating the GDD the detected signal is observed to agree well with Malus's Law for one particular orientation. Furthermore, the frequency dependent GDD-THz interactions are investigated using a 240-380 GHz tunable continuous wave radiation source. Employing both systems allow us to understand the response of GDDs with respect to modulation frequency, RF frequency and polarization orientation. Resonance effects, frequency sensitivity and geometrical structures of GDDs are studied for the purpose of obtaining better performance in THz-GDD interaction for applications including general THz wave detection and imaging.
Subject Keywords
Frequency response
,
THz
,
Mm-wave detection
,
Glow discharge detector
URI
https://hdl.handle.net/11511/36244
DOI
https://doi.org/10.1117/12.2194939
Collections
Department of Physics, Conference / Seminar