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Title: All-dielectric metasurface absorbers for uncooled terahertz imaging

Imaging in the terahertz (THz) range of the electromagnetic spectrum is difficult owing to the lack of high-power sources and efficient detectors. For decades, there has been tremendous effort to fashion focal plane arrays for THz imaging owing to the great number of potential applications. Here, we propose and demonstrate an alternative approach which utilizes all-dielectric metasurface absorbers that act as universal converters of radiation. Incident THz waves are absorbed by the metasurface, converted to heat, and subsequently detected by an infrared camera. We realize a metasurface consisting of sub-wavelength cylindrical resonators that achieve diffraction-limited imaging at THz frequencies without cooling. The low thermal conductivity and diffusivity significantly limit the thermal conduction between neighboring pixels, thus improving the spatial resolution and imaging time. Similar to conventional metallic-based metamaterials, our all-dielectric metasurface absorber can be scaled to other bands of the electromagnetic spectrum, offering a blueprint to achieve novel uncooled bolometric imaging.
Authors:
 [1] ;  [1] ;  [1] ;  [1]
  1. Duke Univ., Durham, NC (United States). Dept. of Electrical and Computer Engineering
Publication Date:
Grant/Contract Number:
SC0014372; ECCS-1542015
Type:
Accepted Manuscript
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 4; Journal Issue: 6; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Research Org:
Duke Univ., Durham, NC (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; metamaterials; terahertz imaging; infrared imaging; absorption; diffraction limit; electromagnetic radiation; power spectra; split ring resonators; thermal management
OSTI Identifier:
1467092

Fan, Kebin, Suen, Jonathan Y., Liu, Xinyu, and Padilla, Willie J.. All-dielectric metasurface absorbers for uncooled terahertz imaging. United States: N. p., Web. doi:10.1364/OPTICA.4.000601.
Fan, Kebin, Suen, Jonathan Y., Liu, Xinyu, & Padilla, Willie J.. All-dielectric metasurface absorbers for uncooled terahertz imaging. United States. doi:10.1364/OPTICA.4.000601.
Fan, Kebin, Suen, Jonathan Y., Liu, Xinyu, and Padilla, Willie J.. 2017. "All-dielectric metasurface absorbers for uncooled terahertz imaging". United States. doi:10.1364/OPTICA.4.000601. https://www.osti.gov/servlets/purl/1467092.
@article{osti_1467092,
title = {All-dielectric metasurface absorbers for uncooled terahertz imaging},
author = {Fan, Kebin and Suen, Jonathan Y. and Liu, Xinyu and Padilla, Willie J.},
abstractNote = {Imaging in the terahertz (THz) range of the electromagnetic spectrum is difficult owing to the lack of high-power sources and efficient detectors. For decades, there has been tremendous effort to fashion focal plane arrays for THz imaging owing to the great number of potential applications. Here, we propose and demonstrate an alternative approach which utilizes all-dielectric metasurface absorbers that act as universal converters of radiation. Incident THz waves are absorbed by the metasurface, converted to heat, and subsequently detected by an infrared camera. We realize a metasurface consisting of sub-wavelength cylindrical resonators that achieve diffraction-limited imaging at THz frequencies without cooling. The low thermal conductivity and diffusivity significantly limit the thermal conduction between neighboring pixels, thus improving the spatial resolution and imaging time. Similar to conventional metallic-based metamaterials, our all-dielectric metasurface absorber can be scaled to other bands of the electromagnetic spectrum, offering a blueprint to achieve novel uncooled bolometric imaging.},
doi = {10.1364/OPTICA.4.000601},
journal = {Optica},
number = 6,
volume = 4,
place = {United States},
year = {2017},
month = {5}
}