High-contrast tunable unidirectional reflectionless phenomenon near the exceptional points in integrated bulk Dirac semimetal waveguide

Wu, Ziying; Zeng, Yi; Liu, Guidong; Wang, Lingling; Lin, Qi

doi:10.35848/1882-0786/ac1ca5

Cited by 3 publications

(1 citation statement)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sensor operating near EP, which have been shown to provide dramatic variations of their eigenvalues in response to small parameter changes. The peculiar optical phenomena near EP have important applications in optical super-sensitive detector [4,5], unidirectional reflectionless propagation [6], waveguide transmission [7], gas sensing [8], particle and biological sensing [9][10][11][12] etc. The application of EP phenomenon in PT symmetry system in optical field has great development prospects.…”

Section: Introductionmentioning

confidence: 99%

Two-parameter Optical Sensing Based on Multilayer Parity-time-symmetric Structure

Huang¹,

Meng²

2023

AJST

View full text Add to dashboard Cite

A two-parameter sensor that can detect the variation of temperature and refractive index is realized in a multilayer dielectric structure obeying parity-time (PT) symmetry. The sensor can operate near exceptional points (EPs), which have been shown to provide dramatic variations of their eigenvalues in response to small parameter changes. The optical sensing behavior is theoretically investigated based on the transfer matrix method. The results show that the sensor can work within the surrounding temperature (tp) ranging from 0 to 30℃, and the refractive index (ng) of incident medium ranging from 1.0 to 1.4. The detectable variation △ng of the sensor can reach 0.02. The sensitivity of ng and tp can reach 372496.53 RIU-1 and 249.18℃-1, respectively. Our structures show great promise in temperature monitoring in cold environment and identification of chemical gases or liquids.

show abstract

Section: Introductionmentioning

confidence: 99%

Two-parameter Optical Sensing Based on Multilayer Parity-time-symmetric Structure

Huang¹,

Meng²

2023

AJST

View full text Add to dashboard Cite

show abstract

Analytical investigation of unidirectional reflectionless phenomenon near the exceptional points in graphene plasmonic system

Li,

Liu

et al. 2023

Opt. Express

View full text Add to dashboard Cite

We propose a two-dimensional array made of a double-layer of vertically separated graphene nanoribbons. The transfer matrix method and coupled mode theory are utilized to quantitatively depict the transfer properties of the system. We present a way to calculate the radiative and the intrinsic loss factors, combined with finite-difference time-domain simulation, conducting the complete analytical analysis of the unidirectional reflectionless phenomenon. By adjusting the Fermi energy and the vertical distance between two graphene nanoribbons, the plasmonic resonances are successfully excited, and the unique phenomena can be realized at the exceptional points. Our research presents the potential in the field of optics and innovative technologies to create advanced optical devices that operate in the mid-infrared range, such as terahertz antennas and reflectors.

show abstract

Dark modes in symmetric bulk Dirac semimetal dimers excited by cylindrical vector beams

Zhang¹,

Ma²,

Long³

et al. 2021

Appl. Phys. Express

Self Cite

View full text Add to dashboard Cite

Dark plasmonic modes with sharp spectral resonance peak and exceptionally high quality factor makes it essential for applications in bio-chemical sensing and fluorescence enhancement. Here, we investigate the mid-infrared spectral responses of bulk Dirac semimetal (BDS) dimers under focused azimuthally polarized and radially polarized cylindrical vector beams (CVB). Through numerical simulations, we obtained direct excitation of dark modes and revealed how the beams manipulate the dipole hybridization to produce these modes. By tuning Fermi energy of BDS, the resonant wavelength of the dark modes can be further adjusted. Our results may find the application of CVB in plasmonic sensing.

show abstract

High-contrast tunable unidirectional reflectionless phenomenon near the exceptional points in integrated bulk Dirac semimetal waveguide

Cited by 3 publications

References 27 publications

Two-parameter Optical Sensing Based on Multilayer Parity-time-symmetric Structure

Two-parameter Optical Sensing Based on Multilayer Parity-time-symmetric Structure

Analytical investigation of unidirectional reflectionless phenomenon near the exceptional points in graphene plasmonic system

Dark modes in symmetric bulk Dirac semimetal dimers excited by cylindrical vector beams

Contact Info

Product

Resources

About