Observation of Aulter–Townes splitting in subwavelength grating metamaterial ring resonators

Abstract

Subwavelength grating metamaterial (SGM) waveguide is typically treated as a homogeneous medium without considering the intra-waveguide reflection. However, this approximation is not always valid, especially in resonators. Inthis paper, we show that the reflection induced mutual coupling between the clock-wise (CW) and counter clock- wise(CCW) resonant modes in subwavelength grating metamaterial waveguide ring resonator (SGMRR) breaks the degeneracy of the two modes, leading to the formation of Autler-Townes splitting (ATS). This phenomenon could beleveraged to improve the detection limit of SGMRR based sensors.

Topological States Decorated by Twig Boundary in Plasma Photonic Crystals

“…The plasma blackout originates from re-entry process of the aircraft into the atmosphere, which provides negative permittivity at a specific frequency and enforces the formation of evanescent waves in plasma. [6,7] Achieving robust transmission in the negative permittivity background deserves further investigation. Topological states based on photonic crystal platforms in general rely on the structural symmetry and boundary decoration.…”

Classic analogue of Autler–Townes-splitting transparency using a single magneto-optical ring resonator

“…[12] Simultaneously, the concept of ATS has been transferred to other disciplines of physics, such as nano-structured metamaterials and coupled resonator arrays. [14][15][16][17][18][19][20][21][22][23][24][25][26] Especially, on-chip sensors or nanoparticle detection can be achieved by utilizing ATS-like effect. [16,17,22] Both optical ring resonator (ORR) [27][28][29][30] and whisperinggallery micro-resonator (WGMR) [15][16][17]31,32] are the promising platforms for classic and all-optical analogs of ATS.…”

“…[14][15][16][17][18][19][20][21][22][23][24][25] For example, Peng et al provided an experimental observation of ATS-like spectra in integrated on-chip WGMR systems where the input wave interacts with the two coupled WGMRs. [20] In addition, an optical on-chip single microcavity system leading to ATS-like transparency is considered by introducing surface roughness, [14,18,19] material inhomogeneity, [26] or the presence of scatterers [16,17,22] in ORR or WGMR, and it has the obvious advantages of an easily fabrication and a compact size for better integration.…”