Selected publications


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Ultraviolet surface plasmon laser

We used the exciton–surface-plasmon coupling effect to produce an ultraviolet plasmonic nanolaser that can be operated at room temperature. Because the plasmonic nanolaser exhibited substantial mode dispersion, the laser currently holds the record for the world’s greatest group velocity index value of 80 and the world’s smallest mode volume. This type of ultraviolet plasmonic nanolaser has strong potential in numerous applications, including for use in biological sensors, optical storage, sub-wavelength imaging, optoelectronic IC and photolithography. This study was published in ACS Nano, 2015, 9(4), pp 3978–3983. (Impact Factor: 12.881, with Dr. Chou being the first author. Associate partners include Professor Lin Sheng-Di from National Chiao Tung University, Department of Electronics Engineering, and Professor Lin Tzy-Rong from National Taiwan Ocean University, Department of Mechanical and Mechatronic Engineering). Furthermore, this study obtained the 14th Far Eastern Y.Z. Hsu Science and Technology Memorial Foundation Paper Award.

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High-temperature surface plasmon laser

Ultraviolet can be used to observe the wavelength of visible light, and most surface plasmon lasers employ a metal–insulator–semiconductor (MIS) structure. We discovered that in certain scenarios featuring pairing of specific material dielectric coefficients, the insulator layer is unnecessary. Furthermore, We demonstrated that under material optimization conditions, a plasmon laser exhibited higher performance without an insulator layer than one did with the MIS structure. Our team adopted high-quality single-crystalline aluminum grown through molecular-beam epitaxy to avoid scatter loss caused by rough surfaces. They discovered that the average laser threshold of this simple laser structure was five times lower than that of dielectric layer structures. Additionally, under single-mode operation, this device could adapt to temperatures up to 353K, making it the highest operating temperature of any plasmonic nanolaser in the world currently. Thus, their research not only simplified the structure but also greatly increased the practicality of surface plasmon nanolasers. This study was published in Nano Lett. 2016, 16, 3179−3186(Impact Factor: 13.799, with Dr. Chou being the first author. Associate partners include Professor Lin Sheng-Di from National Chiao Tung University, Department of Electronics Engineering, and Professor Lin Tzy-Rong from National Taiwan Ocean University, Department of Mechanical and Mechatronic Engineering).

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Ultracompact surface plasmon laser

By manufacturing a subwavelength-scale metal grating, we successfully constrained surface plasmon to the edge of the metal grating. After further lowering the surface plasmon laser mode volume according to a numerical scale, theoretical calculation revealed that the Purcell factor in the system was increased to 100. Additionally, this study is currently the only one in the world that is based on a quasi-one-dimensional surface plasmon laser. The study theoretically proved that manufactured metal surface structures could effectively improve the operation performance of surface plasmon lasers. In addition, this study showed the existence of ultracompact plasmonic nanolasers. In the future, it is hoped to improve the back-end process and achieve room-temperature operation. This study was published in Nano Lett., 2018, 18 (2), pp 747–753 (Impact Factor: 13.799, with Dr. Chou being the first author. Associate partners include Prof. Gwo Shangjr, Prof. Lu Tien-Chang, Prof. Lin Chien-Chung, and Prof. Lin Tzy-Rong from National Tsing Hua University, National Chiao Tung University, and National Taiwan Ocean University)

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