Quantum Optics seminar: Yong-Hoon Cho, Korea Advanced Institute of Science and Technology (KAIST)

The group III-V and III-nitride semiconductor nanophotonic structures have gained considerable interest owing to their wide range of photonic applications for light-emitting devices (LEDs), single-photon sources, and exciton-polariton devices. Here, we present classical and quantum light generation and control with nanophotonic structures based on group-III nitride and arsenide semiconductors. First, we demonstrated phosphor-less white LEDs with three-dimensional GaN-based structures. Sub-micrometer LED arrays were also fabricated using mask-less and etching-free pixilation technique [3]. Second, we achieved site-selective single-photon generation from site-controlled InGaN quantum dots formed on pyramidal array structures [4-6] and selectively quenched InAs quantum dots [7]. Third, we accomplished room-temperature polariton condensates within GaN-based single hexagonal microrods [8]. Furthermore, this system allowed us to explore the polariton-based non-Hermitian system at room temperature [9], providing an excellent platform for investigating non-Hermitian physics and developing innovative photonic applications.

  

[1]    S. H. Lim, Y. H. Ko, C. Rodriguez, S. H. Gong, and Y. H. Cho*, Light: Science & Applications 5, e16030 (2016).

[2]    S. Choi, H. G. Song, S. Cho, Y. H. Cho*, Nano Letters 19, 8454 (2019).

[3]    J. H. Moon, B. U. Kim, M. Choi, K. Y. Woo, B. S. Kim, S. H. Ahn, S. M. Jun, Y. H. Song, Y. H. Cho, Advanced Materials 2206945 (2023).

[4]    H. S. Yeo, K. Lee, J. H, Cho, S. H. Park, and Y. H. Cho*, Nano Letters 20, 8461 (2020).

[5]    M. Choi, S. Jun, K. Y. Woo, H. K. Song, H. S. Yeo, S. Choi, D. Park, C. H. Park, and Y. H. Cho*, ACS Nano 15, 11317 (2021).

[6]    S. Jun, M. Choi, B. Kim, M. Morassi, M. Tchernycheva, H. Song, H. Yeo, N. Gogneau, Y. Cho, Small 19, 2205229 (2022)

[7]    M. Choi, M. Lee, S. Y. Park, B. S. Kim, S. Jun, S. I. Park, J. D. Song*, Y. H. Ko*, and Y. H. Cho*, Advanced Materials 2210667 (2023).

[8]    H. G. Song, S. Choi, C. H. Park, S. H. Gong, C. Lee, M. S. Kwon, D. G. Choi, K. Y. Woo, and Y. H. Cho*, Optica 6, 1313 (2019).

[9]    H. G. Song, M. Choi, K. Y. Woo, C. H. Park, and Y. H. Cho*, Nature Photonics 15, 582 (2021).