期刊
SCIENTIFIC REPORTS
卷 10, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41598-020-58456-y
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资金
- Open Research Fund of State Key Laboratory of Pulsed Power Laser Technology [SKL2018KF04]
- National Natural Science Foundation of China [51901001]
- Provincial Natural Science Foundation of Anhui Higher Education Institution of China [KJ2019A0016, KJ2018A0175]
- Anhui Provincial Natural Science Foundation [1908085MF198]
Due to their low losses, dielectric metamaterials provide an ideal resolution to construct ultra-narrowband absorbers. To improve the sensing performance, we present numerically a near-infrared ultra-narrowband absorber by putting ultra-sparse dielectric nanowire grids on metal substrate in this paper. The simulation results show that the absorber has an absorption rate larger than 0.99 with full width at half-maximum (FWHM) of 0.38nm. The simulation field distribution also indicates that the ultra-narrowband absorption is originated from the low loss in the guided-mode resonance. Thanks to the ultra-narrow absorption bandwidths and the electric field mainly distributed out of the ultra-sparse dielectric nanowire grids, our absorber has a high sensitivity S of 1052nm/RIU and a large figure of merit (FOM) of 2768 which mean that this ultra-narrowband absorber can be applied as a high-performance refractive index sensor.
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