Proof-of-principle of surface detection with air-guided quantum cascade lasers.
We report a proof-of-principle of surface detection with air-guided quantum cascade lasers. Laser ridges were designed to exhibit an evanescent electromagnetic field on their top surface that can interact with material or liquids deposited on the device. We employ photoresist and common solvents to provide a demonstration of the sensor setup. We observed spectral as well as threshold currents changes as a function of the deposited material absorption curve. A simple model, supplemented by 2D numerical finite element method simulations, allows one to explain and correctly predict the experimental results.
Institut d'Electronique Fondamentale, Universite Paris-Sud and CNRS, UMR 8622, 91405 Orsay, France. moreau@ief.u-psud.fr
Virginie
V
Moreau
Raffaele
R
Colombelli
Raviv
R
Perahia
Oskar
O
Painter
Luke R
LR
Wilson
Andrey B
AB
Krysa
D000042:Absorption; D000388:Air; D054023:Lasers, Semiconductor; D008962:Models, Theoretical; D013499:Surface Properties