Ultrafast broadband optical modulation in indium tin oxide/titanium dioxide 1D photonic crystal

Abstract

Photonic crystals can integrate plasmonic materials such as indium tin oxide in their structure. Exploiting indium tin oxide plasmonic properties, it is possible to tune the photonic band gap of the photonic crystal upon the application of an external stimuli. In this work, we have fabricated a one-dimensional multilayer photonic crystal alternating indium tin oxide and titanium dioxide via radiofrequency sputtering and we have triggered its optical response with ultrafast pump-probe spectroscopy. Upon photoexcitation, we observe a change in the refractive index of indium tin oxide. Such an effect has been used to create a photonic crystal that changes its photonic bandgap in an ultrafast time scale. All optical modulation in the visible region, that can be tuned by designing the photonic crystal, has been demonstrated.

The single-cycle biphotons generated by noncollinear SPDC in the chirped QPM crystals

“…Of these, when the crystals are quasi-phase-matched structures, the PPLN and Periodically Poled KTiOPO 4 (PPKTP) crystals are the most widely studied [26]. In particular, PPLN crystals, due to their unique crystal structure, have been widely used both theoretically and experimentally [27], including for noncollinear SPDC [28].…”

Fabrication and assessment of mechanically flexible 1D photonic crystals

“…We present the spectroscopic study of a 10-layer SiO2/TiO2 1D photonic crystal, fabricated via RFsputtering [2] on a flexible thermosetting polymer, under different bending conditions, showing interesting results in terms of both optical and mechanical properties, thus making RF-sputtering a promising and scalable technique to fabricate flexible photonic devices [3,4].…”