Antenna integrated quantum cascade laser switchable via telecommunications wavelength probe beam

John Kohoutek*, Alireza Bonakdar, Dibyendu Dey, Ryan Gelfand, Iman Hassani Nia, O. Gokalp Memis, Vala Fathipour, Hooman Mohseni

*Corresponding author for this work

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

Abstract

Here we present an antenna-integrated QCL which can be actively and optically modulated using light in the near infrared, creating an optical nanocircuit - coupling two different frequency antennas with a nonlinear active switching element. For our design, we chose two cross-polarized bow-tie antennas with an aligned central spot. We have used detailed FDTD simulations to choose the length of each bow-tie. The larger bow-tie antenna is resonant with the QCL at 6.1 μm wavelength and is aligned perpendicular to the active region of the device because QCL emits TM polarized light. The smaller bow-tie is resonant with the incoming modulating light at 1550 nm and is aligned perpendicularly to the first bow-tie. There is a rectangular region of amorphous germanium below the smaller bow-tie which acts as an absorber at 1550 nm. When light at 1550 nm is incident upon the device, it is focused and enhanced by the smaller bowtie, creating a region of large absorption in the germanium rectangle below. Free carriers are generated, shorting the larger bow-tie which is already focusing and enhancing light from the QCL mode. When the bow-tie arms of the larger bow-tie are shorted by these free carriers, the focusing and enhancement of the light by the larger bow-tie of the QCL mode is severely diminished, affecting the entire laser output, even the far field. Simulation results, fabrication details, and finally experimental results are discussed. Such an all-optical switch could be useful for telecommunications, free space communications, or rangefinding applications.

Original languageEnglish (US)
Title of host publicationNanophotonic Materials IX
DOIs
StatePublished - Dec 1 2012
EventNanophotonic Materials IX - San Diego, CA, United States
Duration: Aug 15 2012Aug 16 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8456
ISSN (Print)0277-786X

Other

OtherNanophotonic Materials IX
CountryUnited States
CitySan Diego, CA
Period8/15/128/16/12

Keywords

  • All optical switch
  • Broadband antenna
  • Optical nanocircuit
  • Plasmonics
  • QCL

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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