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Dipartimento di Fisica - Politecnico di Milano

[21/11/2019 - 12:00]

Prof. Emiliano Descrovi (Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino)

"Light Manipulation in Multilayered Photonic Structures"

 

gio 21/11/2019 - 15:00 - Aula Rossa, Dipartimento di Fisica

 

ABSTRACT

 

Recent results on light manipulation by means of Bloch Surface Waves (BSWs) on multilayers are 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 Polaritons for metals. Compared to SPPs, BSWs present some advantages, such as lower absorption, narrower mode resonances, stronger near-field surface enhancement effects, longer propagation length, spectral and polarization 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 local density of states associated to BSW can change the emission behavior of organic dipoles located on the multilayer surface.
The concept of a BSW planar cavity is introduced and the corresponding effects on the spectral and temporal signature of emitters located therein will be discussed. In addition, chiral diffractive gratings will be demonstrated to provide an outcoupling mechanism for BSW resulting in free-space propagating beams carrying specific orbital angular momenta.
The presented results have potential applications in the domain of engineered sources for telecommunications and quantum technologies.

 

Bio: Emiliano Descrovi is associate professor in Physics at the Department of Applied Science and Technology (DISAT), Politecnico di Torino, Italy and his research is within the fields of nano-optics and biophotonics.

"Biomedical applications of Raman spectroscopy and confocal Raman spectral imaging"

"Many-body phenomena in driven-dissipative quantum systems"

"Ultrafast spectroscopy of correlated materials"

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