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

TL;DR

This paper presents a novel pressure sensor using a polymer waveguide doped with quantum dots, which detects pressure through changes in optical absorption and emission, enabling precise localization and potential applications in biotechnologies.

Contribution

The study introduces a new pressure sensing method based on quantum dot-modulated optical properties in a polymer waveguide, validated through theoretical and experimental approaches.

Findings

Pressure affects quantum dot absorption and emission.

Sensor can detect both pressure magnitude and location.

The design is validated by calibration and simulations.

Abstract

Recently, nanomaterials are arousing increasing interest and a wide variety of opto-electronic 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 electromagnetic interference, and safe operation in hazard environments. In addition, bio-compatibility, non-toxicity and flexibility make the presented sensor potentially appealing to various application fields such as nanobiotechnology and robotic sensing.