Circular Dichroism Control of Tungsten Diselenide (WSe2) Atomic Layers with Plasmonic Metamolecules

Hsiang-Ting Lin, Chiao-Yun Chang, Pi-Ju Cheng, Ming-Yang Li, Chia-Chin Cheng, Shu-Wei Chang, Lance L. J. Li, Chih-Wei Chu, Pei-Kuen Wei, Min-Hsiung Shih*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


Controlling circularly polarized (CP) states of light is critical to the development of functional devices for key and emerging applications such as display technology and quantum communication, and the compact circular polarization-tunable photon source is one critical element to realize the applications in the chip-scale integrated system. The atomic layers of transition metal dichalcogenides (TMDCs) exhibit intrinsic CP emissions and are potential chiroptical materials for ultrathin CP photon sources. In this work, we demonstrated CP photon sources of TMDCs with device thicknesses approximately 50 nm. CP photoluminescence from the atomic layers of tungsten diselenide (WSe2) was precisely controlled with chiral metamolecules (MMs), and the optical chirality of WSe2 was enhanced more than 4 times by integrating with the MMs. Both the enhanced and reversed circular dichroisms had been achieved. Through integrations of the novel gain material and plasmonic structure which are both low-dimensional, a compact device capable of efficiently manipulating emissions of CP photon was realized. These ultrathin devices are suitable for important applications such as the optical information technology and chip-scale biosensing.

Original languageAmerican English
Pages (from-to)15996-16004
Number of pages9
JournalACS applied materials & interfaces
Issue number18
StatePublished - 9 May 2018


  • two-dimensional materials
  • transition metal dichalcogenides (TMDCs)
  • WSe2
  • surface plasmon
  • metaswface
  • chirality
  • circular dichroism
  • MOS2


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