Abstract
In this paper, we come up with a wavelength tunable absorber which is made up of periodically elliptical graphene arrays in the far-infrared and terahertz regions. Through simulation, we find that we can increase the length of long axis of the ellipse, raise the incidence angles of TM- and TE-polarization (TM- and TE-polarization indicate the direction of the incident electric field along the direction of the x and the y axis, respectively.) within certain limits, and increase the chemical potential of graphene, so as to enhance the absorption of light in the elliptical graphene arrays. We also compare the absorption spectra of the original structure and the complementary structure, and find that the absorption of the original structure is higher than that of the complementary structure. In the end, we study the changes in the absorption rate of the double layer structure of the elliptical array with the increase in the thickness of SiO2. The elliptical array structure can be applied to tunable spectral detectors, filters and sensors at far-infrared and terahertz wavelengths.
Highlights
Since the first introduction of its synthesis via a ‘Scotch tape’ method in 2004, graphene has aroused great interest in the scientific community [1]
There has been less research conducted on elliptical graphene arrays. ringsIn[1t2h,1is3],wcororkss,ews [e14p–r1o6p]oasnedtshoeosnt.uHdyowoefvoepr,ttichaelreahbasosrbpeteionnleesns hreasnecaermchencot nbdauscetdedoonneelllliippttiiccaall ggrraapphheennee. aOrnratyhse. basis of silicon, we add a layer of silica with elliptical graphene
We propose a wavelength-tunable absorber that is made up of periodic elliptical graphene arrays
Summary
Since the first introduction of its synthesis via a ‘Scotch tape’ method in 2004, graphene has aroused great interest in the scientific community [1]. This is precisely because graphene supports the surface plasmon resonance (SPR) like metals. The graphene, which supports surface plasmon resonance, has many excellent properties that can supplement the defects of the metal. This is because the graphene, which supports SPR, is beneficial to the absorption of light energy [9]. There has been less research conducted on elliptical graphene arrays.
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