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www.vadiodes.com
Quasi-Optical Broadband Detectors
9/14/20091
Silicon Lens
• Frequency Range 100-1000 GHz
– Performance expected to ~2 THz
• Responsivity 500 V/W typical
– NEP ~ 10 pW/rtHz
• Antenna directivity 25-35 dB nom.
• Sub-ns response time
QOD Responsivity Testing
• Use lens to fully couple source power to detector
• Allows direct measurement of detector responsivity
• Waveguide coupler used to measure transmitted power
Focusing Mirror
Detector
Source
Focusing Mirror
Quasi-Optical Detector
See next page for THz measurement…
www.vadiodes.com 9/14/20092
600-900 GHz QOD Testing
• The measured QOD response is comparable or higher than the waveguide ZBD in the 600-900 GHz band
• ZBD responsivity 500-1500 V/W over WR-1.2 band
• QOD and ZBD measured using identical test setup
• Horn to horn coupling (1” distance) with no lens
• Provides a relative measurement of two detectors
• Excellent responsivity to > 1 THz
Photo of 600-900 GHz Testing
Source
QOD
1” b/n Tx & Detector
Quasi-Optical Detector
Removable mounting plate