High-speed nano-optical photodetector for free space communication

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

doi:10.1117/12.721336

3 May 2007 High-speed nano-optical photodetector for free space communication

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

Author Affiliations +

Proceedings Volume 6556, Micro (MEMS) and Nanotechnologies for Defense and Security; 65560H (2007) https://doi.org/10.1117/12.721336
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

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.

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Russell M. Kurtz, Khan A. Alim, Ranjit D. Pradhan, Vladimir Esterkin, Gajendra D. Savant, Rama Venkatasubramanian, Minjoo Larry Lee, Suchismita Ghosh, Irene Calizo, and Alexander A. Balandin "High-speed nano-optical photodetector for free space communication", Proc. SPIE 6556, Micro (MEMS) and Nanotechnologies for Defense and Security, 65560H (3 May 2007); https://doi.org/10.1117/12.721336

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KEYWORDS

Photodetectors

Silicon

Sensors

Telecommunications

Capacitance

Data communications

Semiconducting wafers

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