Naslov
Glass-based confined structures fabricated by sol- gel and radio frequency sputtering

Autori
Chiappini, Andrea ; Armellini, Cristina ; Carpentiero, Alessandro ; Vasilchenko, Iustyna ; Lukowiak, Anna ; Ristić, Davor ; Varas, Sterano ; Normani, Simone ; Mazzola, Maurizio ; Chiasera, Alessandro

Izvornik
Optical Engineering (0091-3286) 53 (2014), 7; 071804-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
photonic crystals ; rare-earth-doped materials ; optical properties ; radio frequency-sputtering ; sol-gel

Sažetak
Some of the main results obtained in the field of glass-based photonic crystal (PC) systems using complementary techniques, such as radio frequency (RF) sputtering and sol-gel route, are presented. Initially, rare earth-activated one-dimensional PCs fabricated by RF-sputtering technique will be discussed, specifically the cavity is constituted by an Er3þ-doped SiO2 active layer inserted between two Bragg reflectors consisting of 10 pairs of SiO2∕TiO2 layers. Moreover, from near infrared, transmittance and variable angle reflectance spectra have verified the presence of a stop band from 1500 to 2000 nm with a cavity resonance centered at 1749 nm at 0 deg and quality factor of 890. In the second case, a composite system based on polystyrene colloidal nanoparticles assembled and embedded in an elastomeric matrix will be presented in detail. This system has been designed as a structure that displays an iridescent green color that can be attributed to the PC effect. This feature has been exploited to create a chemical sensor ; in fact optical measurements have evidenced that this system presents a different optical response as a function of the solvent applied on the surface, showing: (1) high sensitivity, (2) fast response, and (3) reversibility of the signal change.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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