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Title: Efficient dielectric metasurface collimating lenses for mid-infrared quantum cascade lasers

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.033310· OSTI ID:1239526
 [1];  [2];  [1];  [2];  [1]
  1. California Institute of Technology, Pasadena, CA (United States). T. J. Watson Laboratory of Applied Physics
  2. California Institute of Technology, Pasadena, CA (United States). Jet Propulsion Laboratory

Light emitted from single-mode semiconductor lasers generally has large divergence angles, and high numerical aperture lenses are required for beam collimation. Visible and near infrared lasers are collimated using aspheric glass or plastic lenses, yet collimation of mid-infrared quantum cascade lasers typically requires more costly aspheric lenses made of germanium, chalcogenide compounds, or other infrared-transparent materials. We report mid-infrared dielectric metasurface flat lenses that efficiently collimate the output beam of single-mode quantum cascade lasers. The metasurface lenses are composed of amorphous silicon posts on a flat sapphire substrate and can be fabricated at low cost using a single step conventional UV binary lithography. Mid-infrared radiation from a 4.8 μm distributed-feedback quantum cascade laser is collimated using a polarization insensitive metasurface lens with 0.86 numerical aperture and 79% transmission efficiency. The collimated beam has a half divergence angle of 0.36° and beam quality factor of M² =1.02.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Light-Material Interactions in Energy Conversion (LMI)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0001293
OSTI ID:
1239526
Journal Information:
Optics Express, Vol. 23, Issue 26; ISSN 1094-4087
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 93 works
Citation information provided by
Web of Science

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Ultra-thin high-efficiency mid-infrared transmissive Huygens meta-optics journal April 2018
Metasurface-integrated vertical cavity surface-emitting lasers for programmable directional lasing emissions journal January 2020
Multiwavelength metasurfaces through spatial multiplexing journal September 2016
Designing Multipolar Resonances in Dielectric Metamaterials journal December 2016
Tunable metasurfaces via subwavelength phase shifters with uniform amplitude journal January 2017
Fundamental limits of ultrathin metasurfaces journal March 2017
Planar metalenses in the mid-infrared journal August 2019
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Gradient metasurfaces: a review of fundamentals and applications journal December 2017
Subwavelength focusing in the infrared range using different metasurfaces journal August 2019
Broadband Achromatic Metalens in the Midinfrared Range journal February 2019
Metasurface optics for full-color computational imaging journal February 2018
Tunable metasurfaces for visible and SWIR applications journal January 2020
High efficiency near diffraction-limited mid-infrared flat lenses based on metasurface reflectarrays journal January 2016
Highly efficient holograms based on c-Si metasurfaces in the visible range journal January 2018
Broadband c-Si metasurfaces with polarization control at visible wavelengths: applications to 3D stereoscopic holography journal January 2018
Alignment-insensitive bilayer THz metasurface absorbers exceeding 100% bandwidth journal January 2019
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Varifocal zoom imaging with large area focal length adjustable metalenses journal January 2018
A review of dielectric optical metasurfaces for wavefront control journal June 2018
High Efficiency Near Diffraction-Limited Mid-Infrared Flat Lenses Based on Metasurface Reflectarrays conference January 2016
Ultra-thin, High-efficiency Mid-Infrared Transmissive Huygens Meta-Optics conference January 2017
Fundamental Limits of Ultrathin Metasurfaces preprint January 2014
Gradient metasurfaces: a review of fundamentals and applications text January 2017