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