TY - JOUR

T1 - Engineering whispering gallery modes in MoSe2/WS2 double heterostructure nanocavities: Towards developing all-TMDC light sources

AU - Alekseev, P. A.

AU - Milekhin, Ilya

AU - Gasnikova, K. A.

AU - Eliseyev, I. A.

AU - Davydov, V. Yu

AU - Bogdanov, A. A.

AU - Kravtsov, V. A.

AU - Mikhin, A. O.

AU - Borodin, Bogdan R.

AU - Milekhin, Alexander G.

N1 - Engineering whispering gallery modes in MoSe2/WS2 double heterostructure nanocavities: Towards developing all-TMDC light sources / P. A. Alekseev, I. A. Milekhin, K. A. Gasnikova [et al.] // Materials Today Nano. – 2025. – Vol. 30. – P. 100633. – DOI 10.1016/j.mtnano.2025.100633. – EDN DHXWSU. The work is supported by Russian Science Foundation, 24-12-00209, https://rscf.ru/project/24-12-00209/.

PY - 2025/6

Y1 - 2025/6

N2 - Transition metal dichalcogenides (TMDCs) have emerged as highly promising materials for nanophotonics and optoelectronics due to their exceptionally high refractive indices, strong excitonic photoluminescence (PL) in monolayer configurations, and the versatility to engineer van der Waals (vdW) heterostructures. In this work, we exploit the intense excitonic PL of a MoSe2 monolayer combined with the high refractive index of bulk WS2 to fabricate microdisk cavities with tunable light emission characteristics. These microdisks are created from a 50-nm-thick WS2/MoSe2/WS2 double heterostructure using frictional mechanical scanning probe lithography. The resulting cavities achieve a 4-10-fold enhancement in excitonic PL from the MoSe2 monolayer at wavelengths near 800 nm. The excitonic PL peak is modulated by sharp spectral features, which correspond to whispering gallery modes (WGMs) supported by the cavity. A microdisk with a diameter of 2.35 μm demonstrates WGMs with a quality factor of up to 700, significantly surpassing theoretical predictions and suggesting strong potential for lasing applications. The spectral positions of the WGMs can be finely tuned by adjusting the microdisk's diameter and thickness, as confirmed by theoretical calculations. This approach offers a novel route for developing ultra-compact, all-TMDC double heterostructure light sources with record-small size.

AB - Transition metal dichalcogenides (TMDCs) have emerged as highly promising materials for nanophotonics and optoelectronics due to their exceptionally high refractive indices, strong excitonic photoluminescence (PL) in monolayer configurations, and the versatility to engineer van der Waals (vdW) heterostructures. In this work, we exploit the intense excitonic PL of a MoSe2 monolayer combined with the high refractive index of bulk WS2 to fabricate microdisk cavities with tunable light emission characteristics. These microdisks are created from a 50-nm-thick WS2/MoSe2/WS2 double heterostructure using frictional mechanical scanning probe lithography. The resulting cavities achieve a 4-10-fold enhancement in excitonic PL from the MoSe2 monolayer at wavelengths near 800 nm. The excitonic PL peak is modulated by sharp spectral features, which correspond to whispering gallery modes (WGMs) supported by the cavity. A microdisk with a diameter of 2.35 μm demonstrates WGMs with a quality factor of up to 700, significantly surpassing theoretical predictions and suggesting strong potential for lasing applications. The spectral positions of the WGMs can be finely tuned by adjusting the microdisk's diameter and thickness, as confirmed by theoretical calculations. This approach offers a novel route for developing ultra-compact, all-TMDC double heterostructure light sources with record-small size.

KW - Transition metal dichalcogenides

KW - TMDC

KW - Whispering gallery modes

KW - WGM

KW - Optical cavity

KW - Optical resonator

KW - Mechanical scanning probe lithography

KW - AFM

KW - Exciton

KW - Photoluminescence

KW - Double heterostructure

KW - WS2

KW - MoSe2

UR - https://elibrary.ru/item.asp?id=84257814

U2 - 10.1016/j.mtnano.2025.100633

DO - 10.1016/j.mtnano.2025.100633

M3 - Article

VL - 30

JO - Materials Today Nano

JF - Materials Today Nano

SN - 2588-8420

M1 - 100633

ER -