Enhanced Third-Harmonic Generation in a Bound State in the Continuum Assisted Multiband All-Dielectric Metasurface
Abstract
Multiband Fano resonances are demonstrated in the near-infrared (near-IR) using an all-dielectric metasurface whose unit cell consists of four silicon nanoblocks on a glass substrate. An in-plane asymmetry triggers symmetry-protected quasi-bound states in the continuum (QBICs), producing multiple high-Q resonances. Their origin is identified through multipolar decomposition of the scattering cross section and field distributions at the resonances. The strong field localization at these resonances enables efficient multiband third-harmonic (TH) generation in the ultraviolet (UV), with a maximum simulated conversion efficiency of 8.5 × 10−3 at a peak pump intensity of 1.6 GW/cm2. The metasurface is fabricated in symmetric and asymmetric configurations, and its linear and nonlinear responses are measured under normal incidence. A TH conversion efficiency of 1.2 × 10−6 is obtained at a peak pump intensity of 3.25 GW/cm2. These results establish a route to multiband photonic devices, including multiwavelength lasers, multiband harmonic generation, and single-photon sources for quantum photonics.
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BibTeX
@misc{mondal2026enhanced,
title = {{Enhanced Third-Harmonic Generation in a Bound State in the Continuum Assisted Multiband All-Dielectric Metasurface}},
author = {Partha Mondal and Hadeel Alamoudi and Rodrigo P. Sanchez and Redha H. Al Ibrahim and Boon S. Ooi and Iman Roqan and Hakan Bagci},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2608.13746},
eprint = {2608.13746},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.13746},
}
RIS
TY - UNPB
TI - Enhanced Third-Harmonic Generation in a Bound State in the Continuum Assisted Multiband All-Dielectric Metasurface
AU - Partha Mondal
AU - Hadeel Alamoudi
AU - Rodrigo P. Sanchez
AU - Redha H. Al Ibrahim
AU - Boon S. Ooi
AU - Iman Roqan
AU - Hakan Bagci
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2608.13746
UR - https://arxiv.org/abs/2608.13746
AB - Multiband Fano resonances are demonstrated in the near-infrared (near-IR) using an all-dielectric metasurface whose unit cell consists of four silicon nanoblocks on a glass substrate. An in-plane asymmetry triggers symmetry-protected quasi-bound states in the continuum (QBICs), producing multiple high-Q resonances. Their origin is identified through multipolar decomposition of the scattering cross section and field distributions at the resonances. The strong field localization at these resonances enables efficient multiband third-harmonic (TH) generation in the ultraviolet (UV), with a maximum simulated conversion efficiency of 8.5 × 10^−3 at a peak pump intensity of 1.6 GW/cm^2. The metasurface is fabricated in symmetric and asymmetric configurations, and its linear and nonlinear responses are measured under normal incidence. A TH conversion efficiency of 1.2 × 10^−6 is obtained at a peak pump intensity of 3.25 GW/cm^2. These results establish a route to multiband photonic devices, including multiwavelength lasers, multiband harmonic generation, and single-photon sources for quantum photonics.
ER -