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Proceedings Paper

High-speed nano-optical photodetector for free space communication
Author(s): Russell M. Kurtz; Khan A. Alim; Ranjit D. Pradhan; Vladimir Esterkin; Gajendra D. Savant; Rama Venkatasubramanian; Minjoo Larry Lee; Suchismita Ghosh; Irene Calizo; Alexander A. Balandin
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Paper Abstract

An inexpensive, easily integrated, sensitive photoreceiver operating in the communications band with a 50-GHz bandwidth would revolutionize the free-space communication industry. While generation of 50-GHz carrier AM or FM signals is not difficult, its reception and heterodyning require specific, known technologies, generally based on silicon semiconductors. We present a 50 GHz photoreceiver that exceeds the capabilities of current devices. The proposed photoreceiver is based on a technology we call Nanodust. This new technology enables nano-optical photodetectors to be directly embedded in silicon matrices, or into CMOS reception/heterodyning circuits. Photoreceivers based on Nanodust technology can be designed to operate in any spectral region, the most important to date being the telecommunications band near 1.55 micrometers. Unlike current photodetectors that operate in this spectral region, Nanodust photodetectors can be directly integrated with standard CMOS and silicon-based circuitry. Nanodust technology lends itself well to normal-incidence signal reception, significantly increasing the reception area without compromising the bandwidth. Preliminary experiments have demonstrated a free-space responsivity of 50 &mgr;A/(W/cm2), nearly an order of magnitude greater than that offered by current 50-GHz detectors. We expect to increase the Nanodust responsivity significantly in upcoming experiments.

Paper Details

Date Published: 3 May 2007
PDF: 9 pages
Proc. SPIE 6556, Micro (MEMS) and Nanotechnologies for Defense and Security, 65560H (3 May 2007); doi: 10.1117/12.721336
Show Author Affiliations
Russell M. Kurtz, Physical Optics Corp. (United States)
Khan A. Alim, Physical Optics Corp. (United States)
Ranjit D. Pradhan, Physical Optics Corp. (United States)
Vladimir Esterkin, Physical Optics Corp. (United States)
Gajendra D. Savant, Physical Optics Corp. (United States)
Rama Venkatasubramanian, RTI International (United States)
Minjoo Larry Lee, RTI International (United States)
Suchismita Ghosh, Univ. of California, Riverside (United States)
Irene Calizo, Univ. of California, Riverside (United States)
Alexander A. Balandin, Univ. of California, Riverside (United States)

Published in SPIE Proceedings Vol. 6556:
Micro (MEMS) and Nanotechnologies for Defense and Security
Thomas George; Zhongyang Cheng, Editor(s)

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