Spain

Nonlinear and electro-optic devices are present in our daily life with many applications: light sources for microsurgery, green laser pointers, or modulators for telecommunication. Most of them use bulk materials such as glass fibres or high-quality crystals, hardly integrable or scalable due to low signal and difficult fabrication. Generating nonlinear or electro-optic effects from materials at the nanoscale can expand the applications to biology and optoelectronics. However, the efficiency of nanostructures is low due to their small volumes.Here I will show several strategies to enhance optical signals by engineering metal-oxides at the nanoscale with the goal of developing nonlinear and electro-optic photonics devices for a broad spectral range. We use metal-oxides such as barium titanate (BTO) and lithium niobate (LNO) as an alternative platform for nanoscale nonlinear photonics. Recently, we focused on bottom-up assemblies of BTO nanoparticles to obtain electro-optic metasurfaces and quasi phase matching effects (Fig.1).The field of metal-oxides at the nanoscale has a huge potential of applications in nanophotonics, integrated optics and telecommunication. Fig. 1: Schematic view of an assembly of BTO nanoparticles for Mie driven random quasi-phase-matching. (Savo et al. Nature Photonics 14, 740, 2020).

PHOTOPTICS 2022

Electro-Optic Metal-Oxides for Miniaturised Telecom and Sensing Devices

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MATERIALS FOR HUMANITY (MH 21)

MH 21 is arranged around 6 themes that focus attention on pressing needs that should be addressed to enhance the well-being of communities and provide a forum for presenting breakthrough discoveries.

keynote

Optical systems are ubiquitous in modern society, with an ever-increasing number of applications covering medical sciences (vision technologies, surgical instrumentation, medical imaging), spatial exploration (telescopes, lenses, spectrometers), telecommunications (fiber optics), information processing (quantum computing), industry (from cutting, welding to precision metrology) and military/weaponry technology, to name but a few examples. Furthermore, laser and optical technology are in general absolutely essential to performing applied research in areas such as chemistry and biology, providing fundamental analysis tools. The success of optical systems and technologies in high-end scientific research has also found its way into everyday consumer products such as printers, displays, discs, cameras and eyeglasses, not to forget that optical fiber is crucial to telecommunications in general and internet in particular. The 10th edition of PHOTOPTICS features three different tracks on Optics, Photonics and Lasers, covering both theoretical and practical aspects. 
CONFERENCE AREAS 
1 . Lasers 
2 . Optics 
3 . Photonics

 The 10th edition of PHOTOPTICS  features three different tracks on Optics, Photonics and Lasers, covering both theoretical and practical aspects

In recent years a wide interest has been spurred by the inverse design of artificial layered heterostructures for nano-biophotonic applications. In particular, the extreme optical properties of artificial hyperbolic dispersion nanomaterials allowed to access new physical effects and mechanisms. The unbound isofrequency surfaces of hyperbolic metamaterials and metasurfaces allow to access virtually infinite photonic density of states, ultrahigh confinement of electromagnetic fields and anomalous wave propagation. Similarly, by layering metal-dielectric thin films is possible to obtain a type of optical coatings that exhibit photonic Fano resonance, or a Fano-resonant optical coating (FROC). We expand the coupled mechanical oscillator description of Fano resonance to thin-film nanocavities. We observed that semi-transparent FROCs can transmit and reflect the same color as a beam splitter filter, a property that cannot be realized through conventional optical coatings. Here, we present the physics of different deeply subwavelength layered heterostructures and how they allow to control light-matter interaction at the single nanometer scale, including within living systems.REFERENCES[1] K. V. Sreekanth, Antonio De Luca & Giuseppe Strangi "Experimental demonstration of surface and bulk plasmon polaritons in hypergratings” Scientific Reports 3, 03291 (2013)[2] K. V. Sreekanth, Y. Alapan, M. ElKabbash, U. A. Gurkan, E. Ilker, M. Hinczevski, A. De Luca and G. Strangi Nature Materials 15, 4 4609 (2016)[3] ElKabbash, M., Letsou, T., Jalil, S.A. Hoffman N., Lininger A., Hinczewski M. et.al & G. Strangi. “Fano-resonant ultrathin film optical coatings”. Nature Nanotechnology (2021). https://doi.org/10.1038/s41565-020-00841-9

Deeply Subwavelength Layered Metamaterials: From Hyperbolic Dispersion Metasurfaces to Fano Resonance Optical Coatings

We present an ultrafast vector microscope with 10 nm spatial and subfemtosecond temporal resolution which is capable of mapping all three vector components of the electric field as well as the magnetic field of light on nanophotonic structures. As first application, we record and analyze the temporal evolution of plasmonic skyrmions and the skyrmion number on a nanostructured gold surface.REFERENCESUltrafast vector imaging of plasmonic skyrmion dynamics with deep subwavelength resolution. T. Davis, D. Janoschka, P. Dreher, B. Frank, F. Meyer zu Heringdorf and H. Giessen.Science 368, eaba6415 (2020).Revealing the subfemtosecond dynamics of orbital angular momentum in nanoplasmonic vortices.G. Spektor, D. Kilbane, A. Mahro, B. Frank, S. Ristok, L. Gal, P. Kahl, D. Podbiel, S. Mathias, H. Giessen, F. Meyer zu Heringdorf, M. Orenstein and M. Aeschlimann.Science 355, 1187 (2017).

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