Guided‐mode resonances in all‐dielectric terahertz metasurfaces
Coupling of diffracted waves in gratings with the waveguide modes gives rise to the guided mode resonances (GMRs). The GMRs provide designer linewidth and resonance intensity amidst a broad background, and thus have been widely used for numerous applications in visible and infrared spectral regions....
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sg-ntu-dr.10356-1416422023-02-28T20:01:01Z Guided‐mode resonances in all‐dielectric terahertz metasurfaces Han, Song Rybin, Mikhail V. Pitchappa, Prakash Srivastava, Yogesh Kumar Kivshar, Yuri S. Singh, Ranjan School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies The Photonics Institute Science::Physics All-dielectric Metasurface Guided-mode Resonance Coupling of diffracted waves in gratings with the waveguide modes gives rise to the guided mode resonances (GMRs). The GMRs provide designer linewidth and resonance intensity amidst a broad background, and thus have been widely used for numerous applications in visible and infrared spectral regions. Here, terahertz GMRs are demonstrated in low‐loss, all‐dielectric metasurfaces, which are periodic square lattices of silicon cuboids on quartz substrates. The silicon cuboid lattice simultaneously acts as a diffraction grating and an in‐plane slab waveguide, thereby resulting in the formation of terahertz GMRs. At oblique incidence, two distinct frequency detuned GMRs are observed. The frequency difference between these two GMRs increases at larger angle of incidence. However, extremely small angle of incidence causes destructive interference between these counter‐propagating GMRs that leads to a nonradiative symmetry‐protected bound state in the continuum. GMRs in all‐dielectric silicon metasurfaces can have potential applications in the realization of efficient terahertz devices such as high‐Q transmission filters with angular spectral selectivity, ultrafast modulators, and free‐space couplers. MOE (Min. of Education, S’pore) Accepted version 2020-06-09T12:55:56Z 2020-06-09T12:55:56Z 2019 Journal Article Han, S., Rybin, M. V., Pitchappa, P., Srivastava, Y. K., Kivshar, Y. S., & Singh, R. (2020). Guided‐mode resonances in all‐dielectric terahertz metasurfaces. Advanced Optical Materials, 8(3), 1900959-. doi:10.1002/adom.201900959 2195-1071 https://hdl.handle.net/10356/141642 10.1002/adom.201900959 3 8 en Advanced Optical Materials This is the peer reviewed version of the following article: Han, S., Rybin, M. V., Pitchappa, P., Srivastava, Y. K., Kivshar, Y. S., & Singh, R. (2020). Guided‐mode resonances in all‐dielectric terahertz metasurfaces. Advanced Optical Materials, 8(3), 1900959-. doi:10.1002/adom.201900959, which has been published in final form at https://doi.org/10.1002/adom.201900959. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. application/pdf |
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Science::Physics All-dielectric Metasurface Guided-mode Resonance Han, Song Rybin, Mikhail V. Pitchappa, Prakash Srivastava, Yogesh Kumar Kivshar, Yuri S. Singh, Ranjan Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
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Coupling of diffracted waves in gratings with the waveguide modes gives rise to the guided mode resonances (GMRs). The GMRs provide designer linewidth and resonance intensity amidst a broad background, and thus have been widely used for numerous applications in visible and infrared spectral regions. Here, terahertz GMRs are demonstrated in low‐loss, all‐dielectric metasurfaces, which are periodic square lattices of silicon cuboids on quartz substrates. The silicon cuboid lattice simultaneously acts as a diffraction grating and an in‐plane slab waveguide, thereby resulting in the formation of terahertz GMRs. At oblique incidence, two distinct frequency detuned GMRs are observed. The frequency difference between these two GMRs increases at larger angle of incidence. However, extremely small angle of incidence causes destructive interference between these counter‐propagating GMRs that leads to a nonradiative symmetry‐protected bound state in the continuum. GMRs in all‐dielectric silicon metasurfaces can have potential applications in the realization of efficient terahertz devices such as high‐Q transmission filters with angular spectral selectivity, ultrafast modulators, and free‐space couplers. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Han, Song Rybin, Mikhail V. Pitchappa, Prakash Srivastava, Yogesh Kumar Kivshar, Yuri S. Singh, Ranjan |
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Article |
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Han, Song Rybin, Mikhail V. Pitchappa, Prakash Srivastava, Yogesh Kumar Kivshar, Yuri S. Singh, Ranjan |
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Han, Song |
title |
Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
title_short |
Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
title_full |
Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
title_fullStr |
Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
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Guided‐mode resonances in all‐dielectric terahertz metasurfaces |
title_sort |
guided‐mode resonances in all‐dielectric terahertz metasurfaces |
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2020 |
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https://hdl.handle.net/10356/141642 |
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