Fano resonance in a subwavelength Mie-based metamolecule with split ring resonator

Abstract

In this letter, we report a method of symmetry-breaking in an artificial Mie-based metamolecule.A Fano resonance with a Q factor of 96 is observed at microwave frequencies in a structure combining a split ring resonator (SRR) and a high-permittivity dielectric cube. Calculations indicate resonant frequency tunability will result from altering the cube's permittivity. The asymmetric spectrum is attributed to both constructive and destructive near-field interactions between the two distinct resonators. Experimental data and simulation results are in good agreement. The underlying physics is seen in field distribution and dipole analysis. This work substantiates an approach for the manipulation of Mie resonances which can potentially be utilized in light modulating and sensing.Metamaterials are artificial structures whose constituent units (metamolecules) have strong electromagnetic properties and are subwavelength in size. They have been the subject of much investigation over the past decade. They allow significant freedom of design, leading to rather intriguing physical properties such as negative refractive index 1,2 , and light transformation 3 . Based on various resonators, such as split ring resonators (SRRs) or variants, electromagnetic metamaterials are able to function as invisible cloaks 4,5 , and perfect lenses 2 .The Fano resonance, a quantum phenomenon exhibiting a non-Lorentzian spectral shape 6,7 and closely related to electromagnetically induced transparency (EIT), can be obtained by a symmetry-breaking method 8-12 in metamaterials. In this way, a dark mode is able to interfere a)

Asymmetric Transmission in a Mie-Based Dielectric Metamaterial with Fano Resonance

“…Figure 1a is the schematic diagram of the proposed metamaterial, and Figure 1b depicts the geometry of the unit cell for simulation. The complex permittivity of the dielectric resonators is set as 155 + 0.3i, a typical value for the CaTiO 3 -1 wt.% ZrO 2 ceramic in the X-band [37]. The chiral metamolecule is comprised of two identical ceramic cuboids.…”

Balanced wideband bandpass filter design based on asymmetric split ring resonators (ASRRs) with wide stopband and multi-transmission zeros

“…Particularly, in recent years, the multiple theoretical studies on artificial electromagnetic (EM) mediums and their applications, such as split ring resonators (SRRs) [1][2][3][4] and complementary split ring resonators (CSRRs) [5][6][7], are developed for the excellent physical performances. Moreover, there are also some deeply performed investigations on SRRs related to the spin-wave magnon-polaritons [8], the Fano resonance [9], a tunable and reconfigurable metamaterial [10], the optical lithography [11] and the magneto-optical response [12]. Specifically, the unique characteristics of the EM resonance of a SRR [1], these effective parameters of the metamaterial [2], the large controllable coupling of SRR [3] and the deep subwavelength of SRR [4] are intensively investigated and some studies have been utilized to design BPFs [13][14][15][16], bandstop filters [17][18][19] and sensors [20,21].…”