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Split Bull's eye shaped aluminum antenna for plasmon-enhanced nanometer scale germanium photodetector. | LitMetric

Split Bull's eye shaped aluminum antenna for plasmon-enhanced nanometer scale germanium photodetector.

Nano Lett

Institute of Microelectronics, A*STAR (Agency of Science, Technology and Research), 11 Science Park Road, Singapore Science Park II, Singapore 117685.

Published: March 2011

AI Article Synopsis

Article Abstract

Bull's eye antennas are capable of efficiently collecting and concentrating optical signals into an ultrasmall area, offering an excellent solution to break the bottleneck between speed and photoresponse in subwavelength photodetectors. Here, we exploit the idea of split bull's eye antenna for a nanometer germanium photodetector operating at a standard communication wavelength of 1310 nm. The nontraditional plasmonic metal aluminum has been implemented in the resonant antenna structure fabricated by standard complementary metal-oxide-semiconductor (CMOS) processing. A significant enhancement in photoresponse could be achieved over the conventional bull's eye scheme due to an increased optical near-field in the active region. Moreover, with this novel antenna design the effective grating area could be significantly reduced without sacrificing device performance. This work paves the way for the future development of low-cost, high-density, and high-speed CMOS-compatible germanium-based optoelectronic devices.

Download full-text PDF

Source
http://dx.doi.org/10.1021/nl104338zDOI Listing

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