Leveraging on ENZ Metamaterials to Achieve 2D and 3D Hyper-Resolution in Two-Photon Direct Laser Writing

17^th International Conference on Optics, Lasers & Photonics

June 26-27, 2021 | Webinar

Giuseppe Emanuele Lio

CNR-INO, National Institute of Optics at National Research Council, via Nello Carrara 1, 50019, Sesto Fiorentino, Florence, Italy, ENS, European Laboratory for Non Linear Spectroscopy, , via Nello Carrara 1, 50019, Sesto Fiorentino, Florence, Italy

Scientific Tracks Abstracts: Jour Las Opt Phot

Abstract :

In the last years, the interest of researchers is mainly focused on an effective way to improve the resolution of one- and two-photon polymerization with application in different frameworks like photonic circuits, polymeric ridges doped with quantum emitters [1], plasmonic-photonic transistors [2], just to name a few. The continuous research on metamaterials allows designing and predicting the optical behavior of a plethora of systems like hyperbolic metamaterials and optical nano-cavities enabling very exciting features including extraordinary transmittance, zero reflectance and giant dephasing [3,4]. By exploiting a metal/insulator/metal/insulator geometry, an upgrade of the standard two-photon direct laser writing (TP-DLW) process to hyper resolution was enabled [5,11]. The improved technique will play a relevant role in nanotechnology. It can pave the way to fabricate new generation of 2D/3D nanometric devices with intriguing applications, such as nanoparticles in a specific disposition [6], or on flexible substrate producing plasmonic resonance shifts [7] and thermoplasmonic effects [8,9]. The achieved voxel reduction of about 89% in height and the 50% in width enable the fabrication of labels exploiting physical unclonable functions (PUFs) [5,11] or the realization of apochromatic broadband metalenses with extended focal length and a depth of focus with a numerical aperture of 0.87 [10,11]. The improved resolution of TP-DLW process is extremely important for industrial applications in several fields such as anti-counterfeiting and flat optics.
Reference:
[1] Integration of Nanoemitters onto Photonic Structures by Guided Evanescent-Wave Nano-Photopolymerization. In: “The Journal of Physical Chemistry C” 123.23 (2019).
[2] Conceptual Implementation of a Photonic-Plasmonic Transistor onto a Structured Nano-Guided Hybrid System. In: “physica status solidi (a)” 217.11 (2020).
[3] A comprehensive optical analysis of nanoscale structures: from thin films to asymmetric nanocavities. In: “RSCAdvances” 9 (37 2019).
[4] Color Gamut Behavior in Epsilon Near-Zero Nanocavities during Propagation of Gap Surface Plasmons. In: “Advanced Optical Materials” 8(17, 2020).
[5] Hyper Resolution Two Photon Direct Laser Writing using ENZ Nano-Cavity. In: “arXiv:2007.13509”
[6] Controlling the optical creation of gold nanoparticles in a PVA matrix by direct laser writing,” J. Eur. Opt. Soc.-Rapid Publ. 11, 27 (2016).
[7] Opto-mechanical control of flexible plasmonic materials. In: “Journal of Applied Physics” 125.8 (2019). [8] Tensile control of the thermal flow in plasmonic heaters realized on flexible substrates. In: “The Journal of Chemical Physics” 151.24 (2019).
[9] Opto-mechanically induced thermoplasmonic response of unclonable flexible tags with hotspot fingerprint. In: “Journal of Applied Physics” 128.9 (2020).
[10] Hyper Resolute Ultra Thin Low Cost All-Dielectric Broadband Achromatic Metalenses. In: “arXiv:2008.03250”
[11] Leveraging on ENZ Metamaterials to Achieve 2D and 3D Hyper-Resolution in Two-Photon Direct Laser Writing. In “Advanced Materials” (2021) DOI: 10.1002/adma.202008644.

Biography :

Dr. Giuseppe Emanuele Lio received his M.Sc. degree in in Science and Engineering of Innovative and Functional Materials with full marks September 2017 at the University of Calabria (Italy). From April to July 2017 he spent a period of stage/internship at the University of Technology of Troyes, France. He awarded the Ph.D in Physics, Chemistry and Material Science and Technology at University of Calabria and the Nanotechnology Institute (CNR-Nanotec). He published several papers focused on photopolymerization, nano-scale fabrication, numerical simulations, and experimental measurements in optics, photonics and plasmonics. He developed experimental expertises in ellipsometry, micro and nano-fabrication, spectroscopy analysis, and spectrofluorometry. He was invited as Research Scholar in the NanoPlasmLab at the Case Western Reserve University in Cleveland, Ohio, USA. There, he improved his knowledge in gainmaterials modeling, and deep machine learning used to design metasurfaces with nano-scale features. Now he his research fellow at the National Institute of Optics-CNR and Eurpean Laboratory for Non-Linear Spectroscopy, LENS at Florence.