Terahertz Pulse Generation with Binary Phase Control in Nonlinear InAs Metasurface
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The effect of terahertz (THz) pulse generation has revolutionized broadband coherent spectroscopy and imaging at THz frequencies. However, THz pulses typically lack spatial structure, whereas structured beams are becoming essential for advanced spectroscopy applications. Nonlinear optical metasurfaces with nanoscale THz emitters can provide a solution by defining the beam structure at the generation stage. We develop a nonlinear InAs metasurface consisting of nanoscale optical resonators for simultaneous generation and structuring of THz beams. We find that THz pulse generation in the resonators is governed by optical rectification. It is more efficient than in ZnTe crystals, and it allows us to control the pulse polarity and amplitude, offering a platform for realizing binary-phase THz metasurfaces. To illustrate this capability, we demonstrate an InAs metalens, which simultaneously generates and focuses THz pulses. The control of spatiotemporal structure using nanoscale emitters opens doors for THz beam engineering and advanced spectroscopy and imaging applications.
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Enhanced THz emission observed in dielectric metasurfaces made of GaAs and InAs reveals a significant role of surface and bulk second-order nonlinearities instead of drift currents caused by the surface field or carrier gradient (photo-Dember effect) present in bulk crystals.
“Enhanced THz emission was also observed in dielectric metasurfaces made of GaAs and InAs216,217, revealing the significant role of surface and bulk second-order nonlinearities instead of drift currents caused by the surface field or carrier gradient (photo-Dember effect) present in bulk crystals.”
From Ultrafast terahertz emission from emerging symmetry-broken materials (2023) · cites this paper as [216]
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Cited by
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Ultrafast terahertz emission from emerging symmetry-broken materials
Pettine, J., Padmanabhan, P., Sirica, N., Prasankumar, R. P., Taylor, A. J., & Chen, H.-T. (2023) · Light: Science & Applications · doi:10.1038/s41377-023-01163-w · Cited by 81 · see citing works
- Authors
- Jung, H., Hale, L. L., Gennaro, S. D., Briscoe, J., Iyer, P. P., Doiron, C. F., Harris, C. T., Luk, T. S., Addamane, S. J., Reno, J. L., Brener, I., & Mitrofanov, O.
- Affiliations
- Sandia National Laboratories (US)
- University College London (GB)
- Corresponding author
- Jung, Hyunseung
- Mitrofanov, Oleg
- ORCID
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2022-11-11
- Volume
- 22
- Issue
- 22
- Pages
- 9077-9083
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W4308771343
- Cited by
- 36
- References
- 46
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 12 · 2023: 13
- FWCI
- 2.12
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Nano Letters (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- arXiv (Cornell University)
- Funders
- Engineering and Physical Sciences Research Council (EP/L015455/1, EP/P021859/1, EP/T517793/1)
- Basic Energy Sciences
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Terahertz technology and applications
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Laser-Matter Interactions and Applications
- Keywords
- terahertz pulse generation, optical rectification
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