[21a-C302-1~9] CS.6 Code-sharing Session of 4.5＆17

▲ [21a-C302-6] Quantization of mode shifts in nanocavities integrated with atomically thin sheets

〇Daiki Yamashita¹, Fang Nan¹, Shun Fujii¹, Keigo Otsuka^1,2, Takashi Taniguchi³, Kenji Watanabe³, Kosuke Nagashio², Yuichiro Kato¹ (1.RIKEN, 2.Univ. of Tokyo, 3.NIMS)

Keywords:two-dimensional materials, photonic crystals, microcavities

Here we substantially boost the responsiveness of microcavities to 2D materials by using specially designed photonic crystal nanobeam structures. Various 2D material types and thickness dependence are investigated, and we find that it is possible to achieve giant wavelength shifts of the cavity mode. By precisely controlling tungsten diselenide (WSe₂) thickness down to a monolayer, we observe quantized mode shifts of the 2D/cavity hybrids. The dielectric constant in the atomically thin limit can be extracted by comparing to finite-difference time-domain calculations. Stacking and removal of WSe₂ flakes are also performed, demonstrating the flexible reconfiguration capability of the 2D/cavity hybrids.