Four-Headed Arrow Shaped Dual Band Perfect Absorbers for Biosensing Applications

Year 2016, , 262 - 265, 01.12.2016

Aytaç Onur , Mustafa Türkmen , Sabri Kaya

https://doi.org/10.18100/ijamec.270397

Abstract

In
this study, a novel perfect absorber (PA) array based on four-headed arrow
nanoparticles for biosensing applications in mid-infrared regime is presented.
Proposed PA array has a dual-band spectral response, and the locations of
resonances can be adjusted by varying the geometrical dimensions of the
structure. Nearly unity absorbance is obtained from the PA array for both
resonances. Different dielectric spacers (MgF₂, SiO₂, and
Al₂O₃) are used to investigate the effects of dielectric
spacer on the absorbance characteristics of proposed PA array. Absorbance
characteristics of PA array are analyzed by using finite difference time domain
(FDTD) method. High field enhancement is achieved by the interaction of the
sharp corners of arrow nanoparticles. Linear correlation between the resonance
frequencies and the refractive index of cladding mediums is determined. Due to
the high refractive index sensitivity and near-field enhancement, and nearly
unity absorbance, the proposed dual-band PA array with adjustable spectral
responses can be useful for biosensing applications in mid-infrared regime. 

Keywords

Perfect absorber, Plasmonics, Biosensing applications

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