Open AccessOptimized microbolometers with higher sensitivity for visible and infrared imaging
Author(s) -
Daniel Razansky,
P.D. Einziger,
Dan Adam,
T. Tamir
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.010426
Subject(s) - materials science , responsivity , optics , surface plasmon resonance , bolometer , microbolometer , optoelectronics , miniaturization , infrared , plasmon , surface plasmon , absorption (acoustics) , localized surface plasmon , detector , photodetector , nanotechnology , physics , nanoparticle
Optimal absorption method for improving the sensitivity of bolometric detection is explored. We show that, in addition to its role in conventional conducting-film detection, the application of plasmon resonance absorption offers highly promising characteristics for efficient far-field thermal detection and imaging. These characteristics include good frequency sensitivity, intrinsic spatial (angle) selectivity without focusing lenses, wide tunability over both infrared and visible light domains, high responsivity and miniaturization capabilities. In this context, we examine the well-known surface plasmon resonance (SPR) regime, but also report on a new type of plasmon resonance excitation, the cavity plasmon resonance (CPR), which offers more flexibility over wide ranges of wavelengths, bandwidths, and device dimensions. Both CPR and SPR occur in metallic films, which are characterized by high thermal diffusivity essential for fast bolometric response.