THz signal generation/propagation in an integrated traveling-wave superconductive/photoconductive heterodyne photodetector

A. Hamed Majedi; Behnood G. Ghamsari

doi:10.1117/12.686284

2 November 2006 THz signal generation/propagation in an integrated traveling-wave superconductive/photoconductive heterodyne photodetector

A. Hamed Majedi, Behnood G. Ghamsari

Author Affiliations +

Proceedings Volume 6373, Terahertz Physics, Devices, and Systems; 63730V (2006) https://doi.org/10.1117/12.686284
Event: Optics East 2006, 2006, Boston, Massachusetts, United States

Abstract

The ultrafast and sensitive detection of an optical beat signal generated from an optical heterodyne system in an integrated traveling-wave photoconductive detector with high-temperature superconducting (HTS) coplanar electrode lines has been introduced for generating THz signals.While the optical beat signal has been absorbed by photoconductive substrate and an HTS center strip, the THz signal is gradually bulit up on the HTS coplanar waveguide (CPW). The kinetic inductive photoresponse of the HTS strip contributes excessively in the generation of multi-THz signal while the response of the photoconductor substrate decreases with increasing THz frequency. A rigorous optical analysis of a multilayer waveguide in conjunction of optical-to-THz signal conversion analysis have been carried out to find the external conversion effciency of such a photodetector. Our simulation shows that the GaAs-based structure with YBCO electrode at1.5 μm exhibits more output THz power than its Si counterpart in 850 nm wavelength.

Citation Download Citation

A. Hamed Majedi and Behnood G. Ghamsari "THz signal generation/propagation in an integrated traveling-wave superconductive/photoconductive heterodyne photodetector", Proc. SPIE 6373, Terahertz Physics, Devices, and Systems, 63730V (2 November 2006); https://doi.org/10.1117/12.686284

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