Taiwan & Japan collaborate on research breakthroughs- Investigate Photoinduced Carrier Transfer in Exciton-Polariton Coupling System between NYCU and NIMS

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Strong-coupling takes place when the energy exchange rate exceeds both cavity dissipation rate and emitter scattering rate. Upon achieving a strong-coupling regime, a new hybrid eigenstate is formed because of the energy difference-induced splitting of two polaritonic states. With the development of nanoscale optics and the demand beyond Moore's Law, two-dimensional MoS2 monolayers are promising candidates for a single emitter. However, less study on charge transfer in the coupling system at room temperature. In this project, we investigate photo-induced carrier transfer in 1D plasmonic nanogrooves (NG) array-2D MoS2 hybrid system with Kelvin probe force microscopy (KPFM) surface potential nanoimaging. Our findings are an important basis to develop metal-2D semiconductor heterodevices.  

Fig. 1: Schematic of photo-induced carrier transport in 1D plasmonic nanogrooves-2D MoS2 hybrid systems.

This project is supported by the Ministry of Science and Technology (MOST) "Outstanding Young Scholars Program", MOST-NIMS international joint project, and the Pilot Overseas Internships from the Ministry of Education. The project’s main PI is Prof. Kuo-Ping Chen, from Institute of Imaging and Biomedical Photonics, College of Photonics, National Yang Ming Chiao Tung University -NYCU (originally, National Chiao Tung University - NCTU). The collaborated Japan research team is led by Dr. Tadaaki Nagao from National Institute for Materials Science (NIMS). The Japan research team also includes young active scientists, Dr. Satoshi Ishii, Dr. Shisheng Li, and Dr. Takaaki Taniguchi.

Fig. 2: (Top) Min-Wen Yu did internship program in Photonics Nano-Engineering Group at NIMS, Japan. (Bottom) NYCU research group visits NIMS.

In this project, we successfully quantitively investigate carriers transfer in TMD based exciton-polariton hybrid system in room temperature. This research was mainly conducted by Ph.D. candidate, Min-Wen Yu. The research results have been published in April 2021, npj 2D Materials and Applications (IF = 9.38, Journal Ranking: 15th/155 in Applied Physics). The collaborative research will continue to develop plasmon-TMD based integrated circuit with plasmon enhanced TMD PL and coupled in TMD photodetectors. This research also has the strong potential in the development of quantum optics and nanophotonics.

Related Articles:
1. Min-Wen Yu, Satoshi Ishii, Shisheng Li, Ji-Ren Ku, Jhen-Hong Yang, Kuan-Lin Su, Takaaki Taniguchi, Tadaaki Nagao, and Kuo-Ping-Chen, “Quantifying photoinduced carriers transport in exciton–polariton coupling of MoS2 monolayers.” npj 2D Materials and Applications, 5, 1-7 (2021).
2. Min-Wen Yu, Satoshi Ishii, Satish Laxman Shinde, Nicholaus Kevin Tanjaya, Kuo-Ping Chen, and Tadaaki Nagao. "Direct Observation of Photoinduced Charge Separation at Transition-Metal Nitride–Semiconductor Interfaces." ACS Applied Materials & Interfaces, 12, 50, 56562–56567 (2020).

Dr. Kuo-Ping Chen
National Yang Ming Chiao Tung University/ Institute of Imaging and Biomedical Photonics
Tel:+886 6-3032121 #57824
Email:kpchen@nycu.edu.tw; kpchen@g2.nctu.edu.tw

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