Programme

P.23 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Optical Force Modulation on Monolayer Graphene in Microcavities: Graphene as a Medium vs. an Interface

Le Tri Dat (1,2), Nguyen Duy Vy (3,4)

(1) Engineering Research Group, Dong Nai Technology University, Bien Hoa City, Vietnam; (2) Faculty of Engineering, Dong Nai Technology University, Bien Hoa City, Vietnam; (3) Laboratory of Applied Physics, Science and Technology Advanced Institute, Van Lang University, Ho Chi Minh City, Vietnam; (4) Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City, Vietnam

In this study, we investigate the optical force exerted on a graphene sheet positioned within an optical microcavity [1]. The optical conductivity of monolayer graphene is modeled using the Kubo formalism. When graphene is treated as a medium layer, its dielectric response is also considered. Notably, the distinction between modeling graphene as an interface versus as an embedded layer has a significant effect on the magnitude of the optical force and the distribution of the electromagnetic field within the cavity. Our results show that the optical force can increase by nearly a factor of three when graphene is treated as a dielectric medium, compared to when it is considered as an interface [2]. Furthermore, the optical force can also be manipulated by varying the graphene's position within the cavity and the cavity length. These findings not only advance the understanding of light–matter interaction in hybrid photonic systems but also provide valuable guidance for optimizing the design and performance of graphene-based optical devices. References: [1] C.M. Hoang, T. Iida, L.T. Dat, H.T. Huy, N.D. Vy, Optimal coating thickness for enhancement of optical effects in optical multilayer-based metrologies, Optics Communications 403, 150–154 (2017). [2] N.D. Vy, N.D. Chinh, L.T. Dat, Vinh N.T. Pham, Significant enhancement of optical absorption of graphene inside a metallic optical microcavity, Optics Communications 566, 130658 (2024).

Presenter: Le Tri Dat