Dual behavior of optical antenna integrated with sub-wavelength photodetector to achieve ultra-high specific detectivity

Alireza Bonakdar, Robert L. Brown, Hooman Mohseni

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Fast photodetectors, with high sensitivity and quantum efficiency are highly demanded elements for many applications, such as optical communication, optical interconnects, quantum key distribution, and infrared imaging. Therefore, it is crucial to optimize the quantum efficiency-bandwidth product, while maintaining a low noise. Integration of optical antennas with photodetectors leads to high quantum efficiency due to enhancing light - matter interaction as well as reducing the volume of the detector beyond the diffraction limit. Although, a direct consequence of shrinking the detection size is the noise reduction, the local density of state (LDOS) will be enhanced in the near-field of optical antenna. LDOS enhancement can lead to an increased noise current, by reducing the carrier lifetime due to the enhancement of the radiative recombination rate. This effect could become significant, especially for interband detectors, where the carrier lifetime is quite long compared with intersubband detectors. Here, we simulate and study this effect on the interband and intersubband infrared photodetectros using FDTD simulation.

Original languageEnglish (US)
Title of host publicationInfrared Sensors, Devices, and Applications IV
EditorsArvind I. D'Souza, Priyalal Wijewarnasuriya, Paul D. LeVan, Ashok K. Sood
ISBN (Electronic)9781628412475
StatePublished - 2014
EventInfrared Sensors, Devices, and Applications IV - San Diego, United States
Duration: Aug 18 2014Aug 20 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherInfrared Sensors, Devices, and Applications IV
Country/TerritoryUnited States
CitySan Diego

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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