Sensing applied pressure by triggering electronic quantum many-body excitations in an optical waveguide

Abstract

Recently, nanomaterials are arousing increasing interest and a wide variety of optoelectronic devices have been developed, such as light-emitting diodes, solar cells, and photodetectors. However, the study of the light emission properties of quantum dots under pressure is still limited. By using a joint theoretical and experimental approach, we developed a polymer waveguide doped with CdSe quantum dots for pressure sensing.Absorption and re-emission effects of the quantum dots are affected by the pressure applied on the waveguide. Specifically, since both amplitude and wavelength are modulated, not only the pressure can be detected, but also its location along the waveguide.The calibration results demonstrate the feasibility of the proposed force sensor design.Theoretical model and simulations further validate the presented sensing principle.The proposed prototype benefits from the main advantages of optical sensors, such as their predisposition to miniaturization, small cable sizes and weights, immunity to

Effective pressure sensor using the parity-time symmetric photonic crystal

“…where SiO2 e s is the dielectric constant of the embedded silica of loss and gain layers. As the small particles of quantum dots are embedded into the SiO 2 layers with low concentrations, it will be assumed that the pressure effect on the refractive index of quantum dots can be neglected [55]. The ω is the frequency of the incoming wave and α is the intensity of the Lorentz oscillation.…”