Coupled two aluminum nanorod antennas for near-field enhancement

doi:10.1007/s12200-017-0663-2

Front. Optoelectron.

2017, Vol. 10

Issue (2) : 138-143 https://doi.org/10.1007/s12200-017-0663-2

RESEARCH ARTICLE

Coupled two aluminum nanorod antennas for near-field enhancement

Yan DENG(

), Jian OU, Jiangying YU, Min ZHANG, Li ZHANG

Department of Mathematics and Physics, Anhui Jianzhu University, Hefei 230601, China

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Abstract

Aluminum (Al) plasmonic nanoantennas possess many tunabilities in the ultraviolet (UV) region and have a variety of new applications, such as in sensitive UV photodetection and UV photolithography. Using discrete dipole approximation (DDA), the resonant optical properties and enhanced local field distribution of coupled Al nanorod antennas were investigated. The effects of gap distance on the extinction spectra were analyzed to obtain the surface plasmon modes of these nanostructures across the visible and in the UV spectral range, which can be attributed to the coupling of the surface plasmon modes from each Al nanorod. In addition, the enhanced local field factors plotted as a function of gap distance were simulated under transverse and longitudinal polarizations to achieve maximum near-field enhancement for the optical antennas. When the gap distance was decreased to 5 nm, the maximum value of the enhanced factor was 18.04 at the transverse mode peak of 424 nm. This could be explained by the combination of the interaction between the charges distributed at the opposite ends of two Al nanorods and the interaction between the charges distributed at the lateral sides of each Al nanorod. Results showed that the coupled Al nanorod antennas with enhanced local field show promise for UV plasmonics.

Keywords aluminum (Al) nanorod optical antennas surface plasmon resonance (SPR)

Corresponding Author(s): Yan DENG

Online First Date: 30 December 2016 Issue Date: 05 July 2017

Cite this article:

Yan DENG,Jian OU,Jiangying YU, et al. Coupled two aluminum nanorod antennas for near-field enhancement[J]. Front. Optoelectron., 2017, 10(2): 138-143.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-017-0663-2
https://academic.hep.com.cn/foe/EN/Y2017/V10/I2/138

Fig.1 Extinction spectra for two Al nanorod antennas with increasing gap distance from 5 to 70 nm

Fig.2 Gap effect on extinction spectra of two Al nanorod antennas: (a), (c) transverse plasmon resonance and (b), (d) longitudinal plasmon resonance

Fig.3 Effect of antenna gap size on local field enhancement at (a) transverse plasmon resonance and (b) longitudinal plasmon resonance

Fig.4 Calculated electromagnetic field distributions for the optical antenna with the gap distance of (a) 5 nm at transverse plasmon resonance and (b) 50 nm at longitudinal plasmon resonance

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