Design of midinfrared photodetectors enhanced by resonant cavities with subwavelength metallic gratings

We propose a metallic Fabry–Perot cavity with a Au grating and a Au film acting as two reflectors to enhance the field and absorption in the active detector region, leading to better performance of quantum-dot-based photodetectors at a wavelength of 10 μm. One- and two-dimensional Au gratings are applied to achieve enhancement for polarized and unpolarized light, respectively. With optimizing grating parameters, the absorption can be enhanced by about 20 times in the active detector region compared to conventional photodetectors without the Au reflectors.

[1]  M. Segev,et al.  Mid-infrared photoconductivity in InAs quantum dots , 1997 .

[2]  J. Muszalski,et al.  Resonant cavity enhanced photonic devices , 1995 .

[3]  Jamie D. Phillips,et al.  Self-assembled InAs-GaAs quantum-dot intersubband detectors , 1999 .

[4]  Elias Towe,et al.  NORMAL-INCIDENCE INTERSUBBAND (IN, GA)AS/GAAS QUANTUM DOT INFRARED PHOTODETECTORS , 1998 .

[5]  Sanjay Krishna,et al.  Demonstration of a 320×256 two-color focal plane array using InAs/InGaAs quantum dots in well detectors , 2005 .

[6]  R A Linke,et al.  Beaming Light from a Subwavelength Aperture , 2002, Science.

[7]  K. Nishi,et al.  Si Nano-Photodiode with a Surface Plasmon Antenna , 2005, LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings.

[8]  E. H. Putley,et al.  Preparation and properties of HgTe and mixed crystals of HgTe-CdTe , 1959 .

[9]  S. Brueck,et al.  Enhancing the signal-to-noise ratio of an infrared photodetector with a circular metal grating. , 2008, Optics Express.

[10]  Zhiyuan Li,et al.  Photonic band structures solved by a plane-wave-based transfer-matrix method. , 2003, Physical review. E, Statistical, nonlinear, and soft matter physics.

[11]  N. Fang,et al.  Sub–Diffraction-Limited Optical Imaging with a Silver Superlens , 2005, Science.

[12]  Ben A. Munk,et al.  Frequency Selective Surfaces: Theory and Design , 2000 .

[13]  M. Razeghi,et al.  Handbook of Infrared Detection Technologies , 2002 .

[14]  S. Collin,et al.  Resonant-cavity-enhanced subwavelength metal–semiconductor–metal photodetector , 2003 .

[15]  Andreas Stintz,et al.  High-responsivity, normal-incidence long-wave infrared (λ∼7.2 μm) InAs/In0.15Ga0.85As dots-in-a-well detector , 2002 .

[16]  E. Palik.  Handbook of Optical Constants of Solids , 1997 .

[17]  Andreas Stintz,et al.  Resonant cavity enhanced InAs∕In0.15Ga0.85As dots-in-a-well quantum dot infrared photodetector , 2007 .

[18]  P. Petroff,et al.  Intersublevel transitions in InAs/GaAs quantum dots infrared photodetectors , 1998 .

[19]  Lifeng Li,et al.  New formulation of the Fourier modal method for crossed surface-relief gratings , 1997 .

[20]  M. Buchanan,et al.  Resonant-cavity-enhanced p-type GaAs/AlGaAs quantum-well infrared photodetectors , 2000 .