Ultrafast, Uncooled Long Wave Infrared Detection based on Mono-layer Graphene
Abstract
Due to low photon energy of infrared (IR) radiation, cryogenic cooling is required for high sensitive detection. Present uncooled IR detectors lacks sensitivity and response time needed for most applications. To overcome all of these limitations one needs a "magic" material that can strongly absorb infrared radiation which is also tunable with applied voltage. Moreover, the absorption incident should be detectable by a high speed uncooled electronic detection mechanism. No known "bulk" material fulfils all of these requirements. Two-dimensional material, graphene, offers some of these attributes due to unique and tunable band dispersion relation. But due to the absence of bandgap graphene absorption across the optical spectrum is very weak (< 2.3%). The key goal of the proposed work is to increase graphene infrared absorption to > 60%. The proposed detection scheme allows the plasmon excitation energy to quickly convert to hot carrier energy, leading to a directly measureable voltage. Fast response time coupled with strong electronically tunable absorption will enable development of newer classes of graphene based uncooled detectors.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- May 20, 2016
- Source ID
- HR00111610003
Entities
People
- Debashis Chanda
Organizations
- Defense Advanced Research Projects Agency
- University of Central Florida