TY - JOUR

T1 - Peculiarities of the Resonant Response of a Subwavelength Double Grating with Optical PT-Symmetry

AU - Крылов, Игорь Ратмирович

AU - Прохорова, Ульяна Витальевна

AU - Столяров, Василий Александрович

AU - Ефремова, Екатерина Александровна

AU - Зинчик, Александр Адольфович

AU - Шалымов, Егор Вадимович

AU - Шоев, Владислав Иванович

AU - Масыгин, Д. В.

AU - Венедиктов, Владимир Юрьевич

PY - 2023/10

Y1 - 2023/10

N2 - In this paper, we study the features of the resonant response of a system consisting of two subwavelength one-dimensional periodic structures, considering the dispersion of the refractive index in the presence of optical PT-symmetry for TM polarization. For the considered structure in the green wavelength range, two possible resonance lines were identified at 514.86 nm and 518.5 nm. Ultra-narrow resonances (FWHM of 0.00015 nm) have been obtained for transmitted and reflected waves, and a significant enhancement of the resonant response has been achieved (up to 105 times). The dependence of the system’s optical response on the relative position of its two sub-wavelength gratings and the magnitude of the amplification coefficient of the active part was investigated. This can be used to tune the spectral characteristics of filters, modulate the optical radiation, and create optomechanical sensors such as strain gauges.

AB - In this paper, we study the features of the resonant response of a system consisting of two subwavelength one-dimensional periodic structures, considering the dispersion of the refractive index in the presence of optical PT-symmetry for TM polarization. For the considered structure in the green wavelength range, two possible resonance lines were identified at 514.86 nm and 518.5 nm. Ultra-narrow resonances (FWHM of 0.00015 nm) have been obtained for transmitted and reflected waves, and a significant enhancement of the resonant response has been achieved (up to 105 times). The dependence of the system’s optical response on the relative position of its two sub-wavelength gratings and the magnitude of the amplification coefficient of the active part was investigated. This can be used to tune the spectral characteristics of filters, modulate the optical radiation, and create optomechanical sensors such as strain gauges.

KW - PT-symmetry

KW - diffractive optics

KW - optical frequency filters

KW - resonance waveguide gratings (RWG)

UR - https://www.mdpi.com/2304-6732/10/7/721

UR - https://www.mendeley.com/catalogue/02b4fb6a-455c-3dee-b741-ed1775f4fdba/

U2 - 10.3390/photonics10070721

DO - 10.3390/photonics10070721

M3 - Article

VL - 10

JO - Photonics

JF - Photonics

SN - 2304-6732

IS - 7

M1 - 721

ER -