Conference Agenda

Topical Meetings and Sessions:

TOM 1 - Silicon Photonics and Guided-Wave Optics
TOM 2 - Computational, Adaptive and Freeform Optics
TOM 3 - Optical System Design, Tolerancing and Manufacturing
TOM 4 - Bio-Medical Optics
TOM 5 - Resonant Nanophotonics
TOM 6 - Optical Materials: crystals, thin films, organic molecules & polymers, syntheses, characterization and applications
TOM 7 - Thermal radiation and energy management
TOM 8 - Non-linear and Quantum Optics
TOM 9 - Opto-electronic Nanotechnologies and Complex Systems
TOM 10 - Frontiers in Optical Metrology
TOM 11 - Tapered optical fibers, from fundamental to applications
TOM 12 - Optofluidics
TOM 13 - Advances and Applications of Optics and Photonics
EU Project Session
Early Stage Researcher Session

More information on the Topical Meetings

Select a date or location to show only sessions at that day or location. Select a single session for a detailed view (with abstracts and downloads when you are logged in as a registered attendee). The rest of the TOM sessions, EU project session, tutorials, and Early Stage Researcher session will be updated soon. Thank you for your patience!

Please note that all times are shown in the time zone of the conference. The current conference time is: 7th Dec 2022, 11:42:41pm WET

 
 
Session Overview
Session
TOM9 S04: Opto-electronic Nanotechnologies and Complex Systems: Novel effetcts II and chirality
Time:
Wednesday, 14/Sept/2022:
9:00am - 10:30am

Session Chair: Silvia Romano, CNR, Italy
Location: B231

2nd floor, 70 seats

Show help for 'Increase or decrease the abstract text size'
Presentations
9:00am - 9:30am
Invited
ID: 134 / TOM9 S04: 1
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Polarization singularities and optical chirality in dielectric metasurfaces

Lucio Claudio Andreani1, Dario Gerace1, Momchil Minkov2, Luca Zagaglia1, Simone Zanotti1

1Department of Physics, University of Pavia, Italy; 2Flexcompute, Inc., Belmont, MA 02478, USA

We theoretically study the relation between polarization singularities and optical properties in dielectric metasurfaces, or photonic crystal slabs. We focus on nondegenerate photonic bands leading to symmetry-protected Bound States in a Continuum (BICs). First, we discuss how BICs lead to polarization singularities in the far field, whose winding numbers – or topological charges – follows from the symmetry of the lattice. Then, we determine the polarization properties via the Stokes parameters, focusing on the conditions for the occurrence of a nonvanishing circular polarization. Finally, we calculate the optical response in reflection and the degree of circular dichroism. The results shed light on the role of polarization singularities and symmetry in determining the optical chirality.



9:30am - 9:45am
ID: 330 / TOM9 S04: 2
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Metasurface Characterization by using Stokes Parameters

Rincy Kunjumov, Fabio Antonio Bovino, Riccardo Falsini, Concita Sibilia

Università di Roma La Sapienza, Italy

The development of metamaterials-based devices and applications has sparked a surge in interest since they were first realized. Metamaterials are novel artificial materials with unique electromagnetic properties not seen in natural materials. Natural materials such as glass, diamond, wood such have positive electrical permittivity, magnetic permeability, and an index of refraction. But for some other newly engineered metamaterials have negative values for the mentioned material parameters. With these unusual material parameters, Various forms of miniaturized antennas and microwave components/devices for the wireless communications and defence industries can be designed. Metamaterials also can precisely control how light travels through a material. This enables optical systems that were traditionally bulky to be reduced to tiny sizes. We analysed the characterisation of the Metasurface Samples Au-Nanosphere and Au-Nanohole.Characterization was done with the help of stokes parameters by analysis the information about the output polarization of light once the generated input polarization of light interacts with the passive Metasurface samples. Prepared input polarization is pure, and it is equivalent to the quantum representation |φ> (ket). State that after the sample interaction is <φ| (bra)



9:45am - 10:15am
Invited
ID: 233 / TOM9 S04: 3
TOM 9 Opto-electronic Nanotechnologies and Complex Systems

Characterization of output circular polarization degree in lowcost asymmetric metasurfaces

Emilija Petronijevic1, Alessandro Belardini1, Zakaria El-ansary2, Bilal Brioual3, Hari Prasath Ram Kumar1, Tiziana Cesca4, Carlo Scian4, Giovanni Mattei4, Concita Sibilia1

1Sapienza University of Rome, Italy; 2Ibn Tofail University Kénitra, Morocco; 3Abdelmalek Essaâdi University Tanger, Morocco; 4University of Padova, Physics and Astronomy Department, Padova, Italy

Addition of asymmetry in plasmonic nanostructures can lead to chiro-optical phenomena, usually monitored as different absorption of left and right polarization, i.e. circular dichroism. Moreover, interesting features arise when the nanostructure changes the polarization state of the input beam. In this work, we perform extrinsic chirality characterization in a widely tuneable near-infrared range, by monitoring both polarization of the input and of the transmitted beam. We characterize low-cost metasurfaces based on polystyrene nanospheres asymmetrically covered by Ag, by exciting them at different angle of incidence with left, right and linear polarization. We then resolve the circular polarization degree of the transmitted beam, demonstrating resonance-governed circular polarization degree in the output, showing the interplay of both intrinsic and extrinsic chirality.