Probing optical mode hybridization in an integrated graphene nano-optomechanical system

Dash, A and Selvaraja, SK and Naik, AK (2020) Probing optical mode hybridization in an integrated graphene nano-optomechanical system. In: Journal of the Optical Society of America B: Optical Physics, 37 (4). pp. 1122-1126.

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Abstract

We propose a scheme for sensitive local monitoring of mode hybridization in vertically asymmetric waveguides with a nano-optomechanical probe based on graphene. Extracting local information about mode hybridization is challenging using intensity measurements at the output or scanning optical probes over the waveguide. Transferring the information about the guided field profiles into the mechanical mode of graphene (with ultra-low-force sensitivity) using the optical gradient force allows for sensitive probing of the mode hybridization. In our proposed scheme, we estimate that a 100 change in the TE fraction of the fundamental quasi-TM waveguide mode would cause a change in the vibration amplitude of graphene on the order of 1000 pm. The limit of detection of the TE fraction is approximately 0.001. The change in the TE fraction due to index perturbations in the core and cladding can also be used for index sensing with responsivity on the order of 1000 pm change in vibration amplitude per refractive index unit and a limit of detection of 2 � 10�4 refractive index units. This work provides novel methods for applications in optomechanical modulation and sensing. © 2020 Optical Society of America.

Item Type:	Journal Article
Publication:	Journal of the Optical Society of America B: Optical Physics
Publisher:	The Optical Society
Additional Information:	copyright of this article belongs to The Optical Society
Keywords:	Graphene; Optomechanics; Probes; Waveguides, Asymmetric waveguides; Force sensitivity; Intensity measurements; Limit of detection; Local information; Opto-mechanical systems; Refractive index units; Vibration amplitude, Refractive index
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	16 Nov 2020 11:02
Last Modified:	16 Nov 2020 11:02
URI:	http://eprints.iisc.ac.in/id/eprint/65358

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