Mapping the Optomechanical Coupling Mediated by Light among Mechanical Resonators Including Multilayer Cavity and Molecules

Abstract

For a wide range of health applications, label-free sensing is essential, and microphotonics offers innovative technical solutions for pursuing important objectives. It has been shown that the strong light/matter coupling formed between a cavity and molecules through light excitation enhances biological and clinical applications by providing deep insights into molecular analysis. The multilayer cavity’s proposed architecture is meant to promote a robust interaction between light and matter. The top layer was made of silver Ag multishape features that, after being synthesized and characterized, were immobilized on the surface of a multilayer system. A layer of indium tin oxide (ITO) was flipped to produce two distinct layouts. An investigation of the mode behavior was conducted to describe the two layouts; experimental and numerical results point to a strong light/matter interaction by the ITO/SiO2/spacer/Ag design. For the characterization of light/matter coupling, a fluorophore was adsorbed on the surface; the anticrossing energy was then examined by integrating the experimental data with a three mechanical oscillator model. To show the system’s sensitivity, the analysis was carried out again using bovine serum albumin (BSA). The protein is water-soluble and exhibits an infrared absorption band (amide I), while also being active in the Raman region. In addition, it may consistently bind to Ag multishape features. The excellent sensitivity was demonstrated, enabling the use of image analysis to capture the surface-enhanced Raman scattering of BSA. In conclusion, the suggested sensing approach raises fresh possibilities for highly sensitive biomolecule detection method and encourages results when used as a fundamental sensing technique to investigate molecular patterns.

Ag/Au alloy entangled in a protein matrix: A plasmonic substrate coupling surface plasmons and molecular chirality

“…ITO-coated cover slides were utilized as the substrate, and the (3-mercaptopropyl) trimethoxysilane (shortened as //) (Sigma Aldrich, China) was grown by chemical vapor deposition in a furnace including a vacuum, temperature, and pressure control (APPENDIX I) [29] . Table 1 shows some properties of the multilayer.…”

“…= 30 (Γ 𝑚 = 20 𝐻𝑧) [29] . The optomechanical coupling factor for a Fabry-Pérot cavity is 𝐺 = −ω 𝑐 /𝐿 [35] ; photons inside the cavity exert a force on the inner face of the mirrors resulting in a radiation pressure (𝐹 𝑟𝑎𝑑 (𝑡) = −ℏ 𝐺) responsible for a transfer from light momentum to the mechanical system inside the optical cavity and for an optical-mechanical parametric coupling (Figure 1d).…”

Demonstrating more than 2π phase modulation in non-Hermitian asymmetric multilayers

“…ITO-coated cover slides were utilized as the substrate; to graft the Ag layer atop SiO 2 or ITO, a film of (3-mercaptopropyl) trimethoxysilane (Sigma Aldrich) (shortened as //) was preliminarily built by chemical vapor deposition in a home-made furnace including vacuum, temperature and pressure control (table 1, and supporting information, Part I) [12]. The reflectance in the angular space was measured in a Kretschmann geometry.…”

“…To meet this need, the metasurface design must have a narrow spectral width, to achieve a radiative rate to be increased against the dissipative loss rate γ r ≫ Γ, and a maximized resonance frequency shift guaranteeing a strong coupling between the resonant mode of the metasurface and the incoming light. Due to the behavioral diversity and independence of the expensive nanofabrication techniques required for producing metamaterials, Fabry-Pérot multilayer architectures have replaced cleanroom-made systems and found numerous optical applications associated with the improvement of the plasmonic performance derived from the phase modulation [10][11][12][13]. The fundamental configuration relying on an intermediate dielectric layer in between two perfectly reflective mirrors theoretically has zero reflection and enables a wide phase tuning of the Fabry-Pérot systems by a perfect transmission at a resonance wavelength, according to the dielectric layer thickness variations [14,15].…”

Direct measurement of topological invariants in a double emitter system including plasmonic antennae

“…Multilayers are categorized as emitters 1 , with the design and architecture of the layers significantly impacting the optical performance of the structure 2 , 3 , 4 . This is because each layer's refraction index affects the light travel through the electron bandgaps found in semiconductors, causing it to be modified and redirected 5 , 6 , 7 .…”