Rectangular-cavity resonances enhanced absorption in metallic-nanoshelled 2D rod arrays and 3D photonic crystals

Jiafang Li,Baohua Jia,Min Gu,Md Muntasir Hossain

doi:10.1088/1367-2630/12/4/043012

Jiafang Li, Baohua Jia + Show 2 more

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https://doi.org/10.1088/1367-2630/12/4/043012

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Abstract

A metallic-nanoshelled rectangular dielectric rod is proposed to flexibly enhance and tune the structural absorption. Due to the ultra-small thickness of the metallic-nanoshells, electromagnetic (EM) waves can penetrate into the rods and rectangular cavity resonances can be formed. At the cavity resonances, the strong EM wave–matter interaction results in an enhancement in the structural absorption by more than one order of magnitude. By stacking the nanoshelled rods, a three-dimensional (3D) woodpile photonic crystal with both the rectangular cavity resonance and the photonic band gap effect is realized. As a result, the structural absorption of the nanoshelled 3D photonic crystal is significantly enhanced to ∼99.99% at the resonant wavelength.

Highlights

Metallic nanostructures [1], ranging from metallic nanoslits [2, 3] to three-dimensional (3D) metallic photonic crystals (MPCs) [4, 5], have been extensively studied for their intriguing properties such as enhanced transmission [2], resonant absorption [1], [6,7,8] and strong field enhancement [9]
By utilizing the optical cavity modes, field enhancement of a large volume [11] and the strong structural absorption have been realized in large-scale nanoshells [11] and 3D MPCs [5, 12, 13]
We propose to enhance and tune the structural absorption by employing a rectangular cavity resonance in a nanoshelled rod (NRod), which consists of a dielectric rectangular rod coated by a gold nanoshell, as shown in figure 1(a)

Summary

Introduction

Metallic nanostructures [1], ranging from metallic nanoslits [2, 3] to three-dimensional (3D) metallic photonic crystals (MPCs) [4, 5], have been extensively studied for their intriguing properties such as enhanced transmission [2], resonant absorption [1], [6,7,8] and strong field enhancement [9]. By utilizing the optical cavity modes, field enhancement of a large volume [11] and the strong structural absorption have been realized in large-scale nanoshells [11] and 3D MPCs [5, 12, 13].

Results

Conclusion