Optical Limiting Sensor Based on Multilayer Optimization of Ag/VO2 Phase Change Material

Year: 2023

Authors: Baratto C., Gandolfi M., Tognazzi A., Franceschini P., Ambrosio G., Li B., Morales RC., De Ceglia D., Cino AC., Neshev DN., De Angelis C.

Autors Affiliation: CNR INO, Nat Inst Opt, PRISM Lab, I-25123 Brescia, Italy; Univ Brescia, Dept Informat Engn, I-25121 Brescia, Italy; Univ Palermo, Dept Engn, I-90128 Palermo, Italy; Australian Natl Univ, ARC Ctr Excellence Transformat Meta Opt Syst TMOS, Res Sch Phys, Canberra 2601, Australia.

Abstract: An optical limiting sensor working in the infrared (IR) was developed to address the need for eye and sensor protection against laser threats. Metallic and dielectric photonic resonators (thin-film multilayers) incorporating phase-change-materials, such as vanadium dioxide (VO2) were simulated and experimentally realized, with optimization of the deposition procedure by RF magnetron sputtering at low temperature. For the first time, the silver is placed between the substrate and the VO2, thus improving the device limiting performances. By maximizing the difference of transmittance between the ’’on’’ and the ’’off’’ states at the standard light wavelength for telecom applications (1550 nm), we calculated optimum thickness for VO2 and silver films. The deposited thin films were characterized by SEM and Raman spectroscopy, and VO2 transition temperature was investigated by measuring resistance changes. As a proof of concept of the device working principle, we calculated transmittance drop of 70% when the sensor is exposed to a laser pulse excitation (20 ps, 500 MW/cm(2)). Our results pave the way for multilayer with optical limiting properties.

Journal/Review: IEEE SENSORS LETTERS

Volume: 7 (9)      Pages from: 3502104-1  to: 3502104-3

More Information: This work was supported in part by the NATO through Science for Peace and Security (SPS) Programme OPTIMIST under Grant SPSG5850 and in part by Australian Research Council under Grant CE200100010.
KeyWords: Optical sensors; Temperature sensors; Sensors; Substrates; Nonhomogeneous media; Sputtering; Optical pulses; Electromagnetic wave sensors; light intensity sensor; magnetron sputtering; optical limiting; phase-change material; vanadium dioxide (VO2)
DOI: 10.1109/LSENS.2023.3300801

Citations: 1
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