Electric-Field-Induced Coherent Anti-Stokes Raman Scattering of Hydrogen Molecules in Visible Region for Sensitive Field Measurement.

Nonintrusive optical measuring of electric fields in space is crucial for various sciences and technologies. In this study, a simple and highly sensitive optical electric field measurement is demonstrated in high-pressure hydrogen by performing electric-field-induced coherent anti-Stokes Raman scattering (E-CARS) in the visible region. The minimum detectable electric field is 0.

Colloidal Photonic Crystals of Reusable Hydrogel Microparticles for Sensor and Laser Applications.

Although a wide variety of techniques have been developed to date for the fabrication of high-quality colloidal photonic crystals (CPCs) using monodisperse silica and polystyrene microparticles, poly(-isopropylacrylamide) (PNIPA) hydrogel microparticles have rarely been utilized for the preparation of active CPCs despite the intriguing feature of temperature-responsive volume changes. This report describes the promising potential abilities of PNIPA hydrogel microparticles for sensor and laser applications. Monodisperse PNIPA hydrogel microparticles were synthesized by emulsion polymerization, and the microparticle diameter was finely controlled by adjusting the surfactant concentration.