Enhanced optical transmission of composite subwavelength rectangular-hole array based on metal silver thin-film

YunPing QI; BingBing HU; XueWei ZHANG; HanHan GONG; XiangXian WANG

doi:10.1360/SSPMA2018-00221

SCIENTIA SINICA Physica, Mechanica & Astronomica

SCIENTIA SINICA Physica, Mechanica & Astronomica, Volume 49, Issue 1: 014201(2019) https://doi.org/10.1360/SSPMA2018-00221

Enhanced optical transmission of composite subwavelength rectangular-hole array based on metal silver thin-film

YunPing QI^1,*, BingBing HU¹, XueWei ZHANG¹, HanHan GONG¹, XiangXian WANG²

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ReceivedJun 10, 2018
AcceptedAug 31, 2018
PublishedNov 26, 2018

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Abstract

Metal nanostructures can effectively couple the optical radiation energy in free space to a highly confined surface mode due to the excitation of surface plasmons (SPs), resulting in a greatly enhanced local field in the nanoscale range of the metal surface, it’s great significance for the collection and excitation of broadband light. In order to achieve the broadband and high transmittance of metal nanostructures, a composite rectangular-hole array metal micro/nano structure was designed in this paper, and the transmission characteristics of the structure were studied by using the finite difference time domain (FDTD). The results showed that compared with the single hole array, the compound hole structure has many advantages, such as optical field enhancement, tenability and so on, and there are multiple transmission peaks in the transmission spectrum. In addition, we discussed the effects of the length and width of the rectangular holes on the light transmission characteristics of the structure array. For example, with the increase of the length b of the rectangular hole, the maximum transmittance of the structure increases from 79.7% to 88.3%, and corresponding to the central peak increases from 526?nm to 611?nm. Both the transmission bandwidth and transmittance are improved. While the change of the length a of the rectangular hole produces a peculiar multi-peak phenomenon, the analysis shows that when the length a of the rectangular hole is 250?nm, the maximum transmittance of the full symmetric composite rectangular hole array can reach up to 93% and the FWHM of the transmission peak is 354?nm, much larger than the 80?nm proposed in ref. [27], so the frequency selectivity will be enhanced in the design of the filter. At the same time, the effect of the side length D of the center square hole on the transmission characteristics of the structure array is also discussed. The results of our research have certain guiding significance for the development of enhanced optical transmission theory and application value in the fields of novel optical sensors, t filter and optical transparent electrode.

Funded by

国家自然科学基金(6136700561865008)

西北师范大学青年教师科研能力提升计划(NWNU-LKQN-17-6)

甘肃省自然科学基金(17JR5RA078)

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Figure 1
(Color online) Schematic of fully symmetric composite rectangular holes array.
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Figure 2
(Color online) (a) Schematic of composite rectangular hole array; (b) relationship between rectangular length and transmittance spectra; (c) transmission spectra of 50?nm thickness Ag film.
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Figure 3
(Color online) Relationship between aperture width and transmittance spectra.
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Figure 4
(Color online) Electric field distribution at peak value correspondence: (a) b=50?nm, λ=526?nm; (b) b=60 nm, λ=544?nm; (c) b=70?nm, λ=575?nm; (d) b=80?nm, λ=611?nm.
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Figure 5
(Color online) The relation between transmission FWHM and transmittance with rectangular width b, with a=50?nm, D=100?nm unchanged.
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Figure 6
(Color online) Relationship between side length of a square hole and transmittance spectra.
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Figure 7
(Color online) The relation between transmission FWHM and transmittance with side length of a square hole D, with a=50?nm, b=50?nm unchanged.
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Figure 8
(Color online) Electric field distribution at peak value correspondence: (a) D=50?nm, λ=529?nm; (b) D=50?nm, λ=545?nm; (c) D=50?nm, λ=569?nm; (d) D=50?nm, λ=609?nm.
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Figure 9
(Color online) (a) Rectangular length a=150?nm; (b) the relation between transmission bandwidth and rectangular length, a=150?nm.
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Figure 10
(Color online) Electric field distribution at peak value correspondence: (a) a=150?nm, λ=585?nm; (b) a=150?nm, λ=1132?nm.
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Figure 11
(Color online) (a) Rectangular length a=250?nm; (b) the relation between transmission bandwidth and rectangular length, a=250?nm.
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Figure 12
(Color online) Electric field distribution at peak value correspondence: (a) a=250?nm, λ=609?nm; (b) a=250?nm, λ=1212?nm.

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71.36.+c	Polaritons (including photon-phonon and photon-magnon interactions)
41.20.Jb	Electromagnetic wave propagation; radiowave propagation (for light propagation, see 42.25.Bs; for electromagnetic waves in plasma, see 52.35.Hr; for atmospheric, ionospheric, and magnetospheric propagation, see 92.60.Ta, 94.20.Bb, and 94.30.Tz, respectively; see also 94.05.Pt Wave/wave, wave/particle interactions, in space plasma physics)
42.25.Bs	Wave propagation, transmission and absorption [see also 41.20.Jb-in electromagnetism; for propagation in atmosphere, see 42.68.Ay; see also 52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma and 52.38-r Laser-plasma interactions-in plasma physics]
78.67.Pt	Multilayers; superlattices

Enhanced optical transmission of composite subwavelength rectangular-hole array based on metal silver thin-film

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