| Session | ||
TOM8 S2: Fast and THz nonlinear optics
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| Presentations | ||
8:45am - 9:15am
Invited ID: 539 / TOM8 S2: 1 TOM 8 Non-Linear and Quantum optics Invited - Gain-controlled nonlinearities and interactions for complexity-driven photonic reservoir computing 1University of Glasgow, United Kingdom; 2Loughborough University, United Kingdom Nonlinear photonic systems are a promising platform for photonic reservoir computing due to their high bandwidth, parallelism and low power consumption. These devices can potentially enhance or, in some scenarios, replace CMOS-based electronic computing systems. However, a significant challenge lies in the limited scalability of photonic technologies that rely on one-to-one implementations of artificial neurons or logic gates. In this presentation, we will present our research on complexity-driven neuromorphic photonic systems, where complex nonlinear interactions among thousands of optical waves within single optical components drive information processing. Specifically, we will discuss how the nonlinear interactions between optical waves, crucial for efficient photonic reservoir computing, can be adjusted and controlled in gain systems such as integrated lasers or doped fibres. This fine-tuning aims to optimise the system's performance and identify an optimal "complexity" threshold for learning. 9:15am - 9:30am
ID: 220 / TOM8 S2: 2 TOM 8 Non-Linear and Quantum optics Resonant fully dielectric metasurfaces for ultrafast terahertz pulse generation 1Emergent Photonics Research Centre, Dept. of Physics, Loughborough University, Loughborough, LE11 3TU, England, UK; 2Emergent Photonics Lab (Epic), Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH, UK; 3University of Brescia, Department of Information Engineering, via Branze 38, 25123, Brescia, Italy; 4Politecnico di Milano, Department of Physics, Piazza Leonardo Da Vinci 32, 20133, Milan, Italy; 5Matériaux et Phénomènes Quantiques, Université Paris Cité and CNRS, 10 rue A. Domon et L. Duquet, 75013, Paris, France In the framework of optical frequency conversion, metasurfaces have elevated the potential for effective interfacial nonlinear coefficients through various modes of field localization. For the generation of pulsed ultrafast terahertz (THz) signals, metasurfaces present a viable alternative in the domain of surface-scalable sources driven by low-power oscillators (using nJ pulses). However, recent innovations have predominantly relied on surface plasmons (metals) and, more broadly, on excitations within non-transparency windows—conditions that typically impose limitations on applications and the choice of platforms. Here, we demonstrate the utilization of a fully-dielectric, fully transparent semiconductor that exploits surface-nano-structure-mediated resonances alongside its inherent quadratic nonlinear response. Our system exhibits a remarkable 40-fold efficiency enhancement in comparison to the non-decorated substrate. 9:30am - 9:45am
ID: 275 / TOM8 S2: 3 TOM 8 Non-Linear and Quantum optics Generating clean few-cycle pulses in an all-bulk multipass cell scheme 1Aplicaciones del Láser y Fotónica (ALF-USAL), Spain; 2Unidad de Excelencia en Luz y Materia Estructuradas (LUMES), Spain We theoretically demonstrate the generation of clean few-cycle pulses in a three-stage all-bulk multipass cell scheme. By meticulously selecting the number of round trips and the width of the material used in each cell, we are able to keep the three stages in the enhanced frequency chirp regime. The results show the generation of short and clean pulses, with compression factors approaching 50 with a final duration below 1.5 cycles. 9:45am - 10:00am
ID: 276 / TOM8 S2: 4 TOM 8 Non-Linear and Quantum optics Solid and hollow whispering gallery mode resonators for all optical switch 1CNR-IFAC Istituto di Fisica Applicata Nello Carrara, Consiglio Nazionale delle Ricerche, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy; 2Department of Physics, Moscow State University, Moscow 119899, Russia Whispering-gallery-modes resonators (WGMR) are effective switching devices when either coated or filled with non-linear material. We present examples of all-optical switching of hybrid WGM using polyfluorene, a methacrylate azobenzene and an acrylate derivates. We have studied the Kerr non-linear effect and thermal nonlinearities in a such hybrid systems. 10:00am - 10:15am
ID: 364 / TOM8 S2: 5 TOM 8 Non-Linear and Quantum optics Frequency comb generation dynamics in χ(2) + χ(3) AlGaAs microresonators 1Centre de Nanosciences et de Nanotechnologies, CNRS, Palaiseau, France.; 2Université de Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, Paris, France.; 3Sapienza University of Rome, DIET, Roma, Italy.; 4Linköping University, Linköping, Sweden.; 5CNR-INO, Istituto Nazionale di Ottica, Italy. We propose an AlGaAs microring resonator design for the generation of an optical frequency comb by means of the interplay between harmonic generation and Kerr effect. Modal phase matching imposes specific waveguide geometries and, consequently, it impacts the nonlinear efficiency of the system. We show the dynamics of χ(2) + χ(3) comb generation resulting from type-I modal phase matching. | ||