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Related Experiment Video

Updated: Apr 24, 2026

Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities

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Published on: November 30, 2012

Ultra-thin grating coupler for guided exciton-polaritons in WS₂ multilayers.

HyunHee Cho¹, Dong-Jin Shin¹, Junghyun Sung¹

¹Department of Physics, Korea University, Seoul 02841, South Korea.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

Ultra-thin transition metal dichalcogenide (TMDC) gratings support guided exciton-polariton modes. These TMDC nanostructures enable sub-wavelength nanophotonic applications by coupling light and matter interactions.

Keywords:

1D photonic crystal exciton-polariton grating coupler guided mode resonance transition metal dichalcogenide tungsten disulfide

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Last Updated: Apr 24, 2026

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Published on: July 18, 2015

Area of Science:

Condensed Matter Physics
Materials Science
Nanophotonics

Background:

Transition metal dichalcogenides (TMDCs) exhibit strong light-matter interactions.
Exciton-polariton modes arise from coupling between excitons and photons in 2D materials.

Purpose of the Study:

To demonstrate guided mode resonance in ultra-thin TMDC grating structures.
To investigate the polaritonic dispersion and coupling capabilities of these nanostructures.

Main Methods:

Fabrication of ultra-thin tungsten disulfide (WS2) grating structures.
Optical characterization of polarization and thickness dependence.
Analysis of guided exciton-polariton coupling to far-field radiation.

Main Results:

Achieved guided mode resonance in TMDC gratings at ~10 nm thickness.
Observed polaritonic dispersion within a monolithic grating structure.
Demonstrated efficient coupling of near-field exciton-polaritons to the far field.

Conclusions:

Ultra-thin TMDC layers are suitable for supporting guided exciton-polariton modes.
Monolithic TMDC gratings can act as efficient polariton couplers.
These findings pave the way for sub-wavelength nanophotonic devices.