Light manipulation and optical sensing by means of all-dielectric Photonic Crystals
Release time：February 20, 2017 /
Date：24th Feb 3:00 PM
Venue：The New Main Building ROOM B118
An overview of recent results on light manipulation and sensing by means of surface modes on multilayers is provided. Planar multilayers sustaining either TE or TM-polarized BSW offer new opportunities for light management at the nanoscale. BSWs can be considered as the dielectric equivalent of Surface Plasmon for metals. Compared to SPPs, BSWs present some advantages, such as low losses, long propagation lengths, polarization and spectral tunability.
In this talk, I will show how light can be confined and propagated by means of BSW coupling, in a sort of 2D optics fashion, wherein light is flowing on an almost flat surface. In addition, I will discuss how the presence of the high photonic LDOS associated to BSW can change the emission behavior of organic dipoles located on the multilayer surface.
Finally, dielectric multilayered structures are introduced as building blocks for disposable photonic chips for sensing applications. Some experimental configurations are illustrated wherein flat or patterned multilayers are employed for sensing in either label-free, spectroscopic or fluorescence operational modes. In particular, the possibility to enhance and control the emission from fluorescence markers on the chip surface is demonstrated to improve the detection limit in bioassays for cancer diagnostics.