Influence of spherical anisotropy on optical mass sensing in a molecular-plasmonic optomechanical system

Abstract

We use an all-optical pump-probe method to develop a mass sensing mechanism in a molecular plasmonic system at room temperature. The system consists of a double-clamped graphene nanoribbon that parametrically interacts with two types of isotropic and anisotropic spherical plasmonic cavities in the presence of a strong pump field and a weak probe pulse. Based on the mode-selective quantization scheme and analogy with the canonical model of the cavity optomechanics, we formulate the Hamiltonian of the system in terms of the electromagnetic Greens tensor. In this manner, we derive an explicit form of size-dependent optomechanical coupling function and plasmonic damping rate, which include the modal, geometrical, and material features of the plasmonic structure. Engineering material features of the plasmonic nanostructure, we find that the intensity of the probe field transmission spectrum for radially anisotropic spherical nanocavity enhances significantly compared to the silver sphere nanocavity due to the mode volume reduction. This scheme can provide to achieve the minimum measurable mass at room temperature.

References in corpus (19)

• Cavity Optomechanics
• Quantum Plasmonics
• Ultimate limits to inertial mass sensing based upon nanoelectromechanical systems
• Modes and Mode Volumes of Leaky Optical Cavities and Plasmonic Nanoresonators
• Molecular cavity optomechanics: a theory of plasmon-enhanced Raman scattering
• Spontaneous decay in the presence of dispersing and absorbing bodies: general theory and application to a spherical cavity
• QED description of Raman scattering from molecules in plasmonic cavities
• Spontaneous Emission Spectra and Quantum Light-Matter Interactions from a Strongly-Coupled Quantum Dot Metal-Nanoparticle System
• Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources
• Quantum Optics Model of Surface Enhanced Raman Spectroscopy for Arbitrarily Shaped Plasmonic Resonators
• Symmetry properties of vibrational modes in graphene nanoribbons
• Molecular optomechanics in the anharmonic cavity-QED regime using hybrid metal-dielectric cavity modes
• Going beyond PFA: a precise formula for the sphere-plate Casimir force
• Plasmon dispersion in semimetallic armchair graphene nanoribbons
• Mie plasmons: modes volumes, quality factors and coupling strengths (Purcell factor) to a dipolar emitter
• Mode-selective quantization and multimodal effective models for spherically layered systems
• Optomechanical heat transfer between molecules in a nanoplasmonic cavity
• Quantum Plasmonics with multi-emitters: Application to adiabatic control
• Anisotropy enhancement of the Casimir-Polder force between a nanoparticle and graphene