Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces

Chun Chieh Chang; Daniel Headland; Derek Abbott; Withawat Withayachumnankul; Hou Tong Chen

doi:10.1364/OL.42.001867

Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces

Chun Chieh Chang, Daniel Headland, Derek Abbott, Withawat Withayachumnankul, Hou Tong Chen^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

57 Citations (Scopus)

Abstract

We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2p range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μ m-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ~68% overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.

Original language	English
Pages (from-to)	1867-1870
Number of pages	4
Journal	Optics Letters
Volume	42
Issue number	9
DOIs	https://doi.org/10.1364/OL.42.001867
Publication status	Published - 2017 May 1
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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abstract = "We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2p range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μ m-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ~68% overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.",

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AU - Chen, Hou Tong

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AB - We demonstrate a terahertz flat lens based on tri-layer metasurfaces allowing for broadband linear polarization conversion, where the phase can be tuned through a full 2p range by tailoring the geometry of the subwavelength resonators. The lens functionality is realized by arranging these resonators to create a parabolic spatial phase profile. The fabricated 124-μ m-thick device is characterized by scanning the beam profile and cross section, showing diffraction-limited focusing and ~68% overall efficiency at the operating frequency of 400 GHz. This device has potential for applications in terahertz imaging and communications, as well as beam control in general.

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Demonstration of a highly efficient terahertz flat lens employing tri-layer metasurfaces

Abstract

ASJC Scopus subject areas

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