Resonant germanium nanoantenna photodetectors.
Nano Lett
; 10(4): 1229-33, 2010 Apr 14.
Article
en En
| MEDLINE
| ID: mdl-20230043
ABSTRACT
On-chip optical interconnection is considered as a substitute for conventional electrical interconnects as microelectronic circuitry continues to shrink in size. Central to this effort is the development of ultracompact, silicon-compatible, and functional optoelectronic devices. Photodetectors play a key role as interfaces between photonics and electronics but are plagued by a fundamental efficiency-speed trade-off. Moreover, engineering of desired wavelength and polarization sensitivities typically requires construction of space-consuming components. Here, we demonstrate how to overcome these limitations in a nanoscale metal-semiconductor-metal germanium photodetector for the optical communications band. The detector capitalizes on antenna effects to dramatically enhance the photoresponse (>25-fold) and to enable wavelength and polarization selectivity. The electrical design featuring asymmetric metallic contacts also enables ultralow dark currents (approximately 20 pA), low power consumption, and high-speed operation (>100 GHz). The presented high-performance photodetection scheme represents a significant step toward realizing integrated on-chip communication and manifests a new paradigm for developing miniaturized optoelectronics components.
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1
Bases de datos:
MEDLINE
Asunto principal:
Fotometría
/
Nanotecnología
/
Nanoestructuras
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Germanio
Idioma:
En
Revista:
Nano Lett
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos