Multimode Characterization of Silicon Carbide (SiC)/Hexagonal Boron Nitride (h-BN) Hybrid Mechanical Resonator
Yungcong Liu & Yanan Wang
Authors: Yuncong Liu, Yanan Wang
Faculty Mentor: Philip Feng, PhD
College: College of Engineering
Department: Electrical and Computer Engineering
Cavity optomechanical devices have allowed fundamental discoveries spanning from photonic information processing to quantum systems communication. Owing to the high mechanical quality, along with remarkable optical properties, silicon carbide (SiC) has emerged as an appealing material platform for optomechanical applications. A natural application of such cavity optomechanics is its integration with 2D materials due to their ultrahigh mechanical flexibility and ultralow weight. Among them, hexagonal boron nitride (h-BN) has been spotlighted as a promising candidate to implement experiments with cavity optomechanical systems.
Here, we systematically investigate the multimode resonant behavior of hybrid mechanical device consisting of SiC microdisk and h-BN nanomechanical resonator. Mechanical motions of the device are methodically characterized in both numerical simulations and experimental measurements. Utilizing a laser interferometry system, both Brownian-motion thermodynamic fluctuations and photothermally driven mechanical resonances have been detected via this highly sensitive optical readout scheme. The finite element method (FEM) simulations performed using the COMSOL FEMLAB allow numerical exploration of mode coupling between SiC microdisk and suspended h-BN. Deep understanding and control of their nanomechanical properties open new doors to research on combination of optomechanics with mechanical elements, which provides insight into coherent interaction between macroscopic and microscopic domains.