InAs Terahertz Metalens Emitter for Focused Terahertz Beam Generation

Jung, Hyunseung; Brener, Igal; Addamane, Sadhvikas J.; Luk, Ting Shan; Harris, C. Thomas; Subramania, Ganapathi; Mitrofanov, Oleg

doi:10.1002/adpr.202400125

Title: InAs Terahertz Metalens Emitter for Focused Terahertz Beam Generation

Journal Article · 13 October 2024 · Advanced Photonics Research

DOI: https://doi.org/10.1002/adpr.202400125 · OSTI ID:2466266

^[1]; Brener, Igal ^[1]; Addamane, Sadhvikas J. ^[1]; Luk, Ting Shan ^[1]; Harris, C. Thomas ^[1]; Subramania, Ganapathi ^[2];

^[3]

Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM 87123 USA, Sandia National Laboratories Albuquerque NM 87123 USA
Sandia National Laboratories Albuquerque NM 87123 USA
Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque NM 87123 USA, Electronic and Electrical Engineering University College London London WC1E 7JE UK

Metasurfaces have opened doors to combining multiple photonic functionalities in a single compact device. In particular, the ability to generate short terahertz (THz) pulses with precise wavefront engineering in a single THz metasurface redefined the role metasurfaces can play in THz systems. Here, an InAs metalens emitter which generates and focuses a THz pulse beam is demonstrated using a 130 nm thick InAs metasurface designed as a binary‐phase Fresnel zone plate. The THz beam is focused to a spot of ≈430 μm at 1 THz with a short focal length of 5 mm and large numerical aperture of 0.5. Nanoscale InAs Mie resonators comprising the metasurface enable THz generation with an amplitude as high as 20 times compared to plasmonic THz emitters and several times compared to a 1 mm thick ZnTe crystal. This InAs metasurface emitter provides a new paradigm for designing THz imaging, spectroscopy, and communication systems, where THz beam generation and shaping are performed with a single device without compromising the generation efficiency, while eliminating losses and avoiding limitations of phase matching of conventional nonlinear optics approaches.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; NA0003525

OSTI ID:: 2466266

Journal Information:: Advanced Photonics Research, Journal Name: Advanced Photonics Research Journal Issue: 12 Vol. 5; ISSN 2699-9293

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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