Title :
Subwavelength plasmonic absorbers for spectrally selective resonant infrared detectors
Author :
Gokhale, Vikrant J. ; Myers, Paul D. ; Rais-Zadeh, Mina
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
This work presents the first resonant infrared (IR) detectors with integrated nanostructured subwavelength plasmonic gratings designed to selectively absorb long wavelength infrared (LWIR) radiation. The resonant detectors are the smallest in size demonstrated so far. The absorbers are optimized for a spectral wavelength of 10.15 μm and experimentally demonstrate an absorbance of 46% with a Full Width at Half Maximum (FWHM) of 1.7 μm. The absorbed thermal energy causes a fast (sub-millisecond) proportional change in the frequency of the resonator. The combination of resonant IR detectors with integrated plasmonic absorbers enables spectrally selective IR detectors. Each detector in the array can be optimized for different wavelengths, thus enabling a multi-spectral array for IR spectroscopy and multispectral thermal imaging.
Keywords :
diffraction gratings; infrared detectors; infrared spectra; light absorption; nanosensors; nanostructured materials; optical resonators; optical sensors; plasmonics; FWHM; LWIR radiation; absorbed thermal energy; full width at half maximum; integrated nanostructured subwavelength plasmonic grating; integrated plasmonic absorber; long wavelength infrared radiation; multispectral IR spectroscopy array; multispectral thermal imaging; resonant IR detector; spectrally selective IR detector; spectrally selective resonant infrared detector; subwavelength plasmonic absorber; wavelength 1.7 mum; wavelength 10.15 mum; Absorption; Detectors; Gratings; III-V semiconductor materials; Metals; Plasmons; Strips; IR detector; metamaterial; micromechanical resonator; plasmonics;
Conference_Titel :
SENSORS, 2014 IEEE
Conference_Location :
Valencia
DOI :
10.1109/ICSENS.2014.6985167
