Article
Optics
Hela Fenniche, Andrea D'Andrea
Summary: We introduce a new type of optical cavity called laterally patterned microcavity, which is bounded by two parallel subwavelength dielectric gratings (SDGs) on one side and distributed Bragg reflectors (DBRs) on the other side. Compared to traditional planar or DBR-DBR microcavities, this microcavity requires fewer DBRs for achieving spontaneous emission and strong coupling with exciton-cavity mode. The presence of SDGs as mirrors results in a large reflection spectrum and high reflectivity, leading to Rabi splittings and an increased exciton-polariton lifetime inside the microcavity.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2022)
Article
Optics
Tianrui Zhao, Sebastien Ourselin, Tom Vercauteren, Wenfeng Xia
Summary: This study compared four representative DMD-based wavefront shaping methods under the same conditions and found that the RVITM-based algorithm had a higher focusing speed and comparable PBR. The genetic algorithm offered the highest PBR but suffered from the lowest focusing speed.
Article
Optics
Kaige Liu, Hengkang Zhang, Bin Zhang, Qiang Liu
Summary: The paper introduces a new hybrid algorithm combining PSO and SLNN to achieve faster convergence, higher enhancement, and reduced training samples for SLNN. SLNN trained with 1700 training sets can speed up PSO convergence by about 50% and boost the final enhancement by about 24%.
Article
Physics, Applied
Lea La Spina, Quentin Micard, Alexis Mosset, Samuel Margueron, Ausrine Bartasyte, Vincent Laude
Summary: Epitaxial thin films of lithium niobate were grown by direct liquid injection chemical vapor deposition on c-sapphire substrates, exhibiting different families of high-frequency surface acoustic waves. Surface Brillouin light scattering measurements and fast finite element analysis revealed Rayleigh, leaky shear, and leaky longitudinal surface waves excited at frequencies between 10 and 30 GHz, without the need for high-frequency surface acoustic wave transducers.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
Amos Egel, Krzysztof M. Czajkowski, Dominik Theobald, Konstantin Ladutenko, Alexey S. Kuznetsov, Lorenzo Pattelli
Summary: SMUTHI is a Python package for the efficient and accurate simulation of electromagnetic scattering by wavelength-scale objects in planarly layered media. It combines theoretical concepts and features to study a variety of materials and structures.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Biophysics
Chao Fang, Jiaxing Yao, Yuanjun Zhang, Yuan Lin
Summary: Recent evidence shows that living cells can move and form distinct migration patterns on micro-patterned surfaces. A theoretical investigation reveals that the tight interplay between internal cellular activities and external geometrical constraints is behind these experimental observations.
BIOPHYSICAL JOURNAL
(2022)
Article
Physics, Multidisciplinary
Sylvain Gigan
Summary: Multiple scattering in complex and disordered media can be utilized to extract and process information, despite its seemingly detrimental effects. Complex and inhomogeneous media are common in our surroundings, and although scattering appears to destroy all information, it can be exploited for imaging and computing purposes.
Article
Optics
Niall Byrnes, Matthew R. Foreman
Summary: The polarization properties of random N x N scattering matrices distributed according to the circular orthogonal ensemble were studied. 2 x 2 sub-blocks of the scattering matrix were interpreted as Jones matrices and their statistical properties were investigated. Probability density functions for retardance and diattenuation were derived from scattering matrices of arbitrary size and in the limit N -> infinity using the polar decomposition.
OPTICS COMMUNICATIONS
(2022)
Article
Chemistry, Analytical
Arnaud Ducanchez, Maxime Ryckewaert, Daphne Heran, Ryad Bendoula
Summary: In this study, an approach that combines polarized light spectroscopy and the Mueller matrix concept was evaluated to predict physical and chemical parameters of turbid liquid optical phantoms and distinguish absorption and scattering effects.
Article
Engineering, Electrical & Electronic
Hongyuan Wang, Jiaqi Li, Haofeng Hu, Junfeng Jiang, Xiaobo Li, Kan Zhao, Zhenzhou Cheng, Mei Sang, Tiegen Liu
Summary: Polarimetric imaging is an effective way for enhancing image quality in underwater environments. The proposed method based on the Mueller imager synergistically modulates the polarization states of illumination light and a polarization filter in an optical way to filter out backscattered light and improve image quality without digital processing. Experimental results confirm the effectiveness and superiority of this method in scattering media.
IEEE PHOTONICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
John L. Tsalamengas
Summary: This study investigates the oblique scattering of arbitrarily polarized plane waves from radially inhomogeneous and bianisotropic cylinders when all elements of the four constitutive tensors are non-zero. The analysis is based on an exact reformulation of Maxwell's equations as a second-kind linear Volterra matrix integral equation, with a discretization scheme using a high-order Nystrom method. The proposed algorithms have exponential convergence and can handle both single-layer and multilayer cylinders with continuous or sectionally continuous inhomogeneity profiles.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Physics, Multidisciplinary
Xi-Cheng Zhang, Zuo-Gang Yang, Long-Jie Fang, Jing-Lei Du, Zhi-You Zhang, Fu-Hua Gao
Summary: The 3-step phase shift transmission matrix shows significant advantages in focusing effect and signal-to-noise ratio compared to the 4-step phase shift; the reciprocal of the singular value is proportional to the squared intensity, in accordance with singular value theory.
Article
Chemistry, Physical
Maksim Kulichenko, Andrey N. Utenyshev, Konstantin Bozhenko
Summary: The study proposes a strategy for designing molecular electrides as defective unit cells of cubic crystals with a missing anion, and finds that the defective cell geometry becomes more dominant and the nonlinear optical properties become more intense upon transition from lighter to heavier metals. The potential energy surface of Mg4O3, Ca4O3, Sr4O3, and Ba4O3 is very pure, making them promising structures for synthesis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Shenghang Zhou, Xiubao Sui, Wenhui Zhang, Yingzi Hua, Qian Chen, Guohua Gu
Summary: The proposed method uses compressed sensing to enhance image reconstruction by exchanging spatial and temporal resolution, achieving remarkable resolution improvement without relying on a complex optical system for image transmission through scattering media.
OPTICAL ENGINEERING
(2021)
Article
Environmental Sciences
Xiaobo Li, Liping Zhang, Pengfei Qi, Zhiwei Zhu, Jianuo Xu, Tiegen Liu, Jingsheng Zhai, Haofeng Hu
Summary: Polarization characteristics play a crucial role in various fields, but current polarimetric metrics have limited efficacy in high turbidity conditions. In this study, the use of indices of polarimetric purity (IPPs) is proposed as excellent metrics for object identification in scattering conditions. Imaging experiments on different objects under different turbidity levels demonstrate the superiority of IPPs in enhancing image contrast and improving discriminability, especially when combined with dehazing or enhancing algorithms.
Article
Materials Science, Multidisciplinary
David Rosser, Dario Gerace, Yueyang Chen, Yifan Liu, James Whitehead, Albert Ryou, Lucio C. Andreani, Arka Majumdar
Summary: This study reports on the coherent interaction between a two-dimensional excitonic transition in monolayer MoSe2 and an on-chip photonic crystal nanocavity. The interaction is manifested as a dispersive shift of the cavity transmission spectrum when the exciton-cavity detuning is decreased via temperature tuning. The results indicate that our material system is on the verge of strong coupling, and the small mode volume of the resonator facilitates reaching the strongly nonlinear regime.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Nguyen Ha My Dang, Simone Zanotti, Emmanuel Drouard, Celine Chevalier, Gaelle Trippe-Allard, Mohamed Amara, Emmanuelle Deleporte, Vincenzo Ardizzone, Daniele Sanvitto, Lucio Claudio Andreani, Christian Seassal, Dario Gerace, Hai Son Nguyen
Summary: Exciton-polaritons are hybrid excitations resulting from the strong coupling between an active excitonic material and photonic resonances. The experimental investigation of the formation of polariton BICs, arising from the mixing between hybrid inorganic-organic perovskite excitons and an optical bound state in a continuum, confirms the transfer of the topological nature of the photonic BIC to the polariton BIC, paving the way for room temperature polaritonic devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Physics, Multidisciplinary
Davide Nigro, Vincenzo D'Ambrosio, Daniele Sanvitto, Dario Gerace
Summary: This paper introduces an integrated quantum logic device based on two-body polaritonic interaction, highlighting the quantum correlations of polaritons in low-density regime and their potential applications in quantum information processing and metrology.
COMMUNICATIONS PHYSICS
(2022)
Article
Multidisciplinary Sciences
V Ardizzone, F. Riminucci, S. Zanotti, A. Gianfrate, M. Efthymiou-Tsironi, D. G. Suarez-Forero, F. Todisco, M. De Giorgi, D. Trypogeorgos, G. Gigli, K. Baldwin, L. Pfeiffer, D. Ballarini, H. S. Nguyen, D. Gerace, D. Sanvitto
Summary: This study discovered bound states in the continuum (BICs) in a planar photonic crystal lattice, which have a long lifetime and are not affected by radiation. The researchers also demonstrated non-equilibrium Bose-Einstein condensation occurring in the BIC. By combining bosonic condensation and symmetry-protected radiation eigenmodes, they showed a way to impart topological properties onto macroscopic quantum states.
Article
Optics
Davide Nigro, Marco Clementi, Camille-Sophie Bres, Marco Liscidini, Dario Gerace
Summary: Achieving single-photon nonlinearities in photonic devices by utilizing the intrinsic high-order susceptibilities of conventional materials is crucial for practical quantum photonic technologies. In this study, we demonstrate the achievement of this regime in a triply resonant integrated photonic device made of two coupled ring resonators, using a material platform with intrinsic third-order nonlinearity.
Article
Physics, Applied
Massimo Borghi, Federico Andrea Sabattoli, Houssein El Dirani, Laurene Youssef, Camille Petit-Etienne, Erwine Pargon, J. E. Sipe, Amideddin Mataji-Kojouri, Marco Liscidini, Corrado Sciancalepore, Matteo Galli, Daniele Bajoni
Summary: This research reports on the phenomenon of super spontaneous four-wave mixing in a composite optical system, which is analogous to the generation of photon pairs in an integrated photonic device. The researchers provide experimental evidence by studying an array of microring resonators on a silicon photonic chip, showing that the cooperative pair-generation rate always exceeds the incoherent sum of the rates of the individual resonators.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Federico Andrea Sabattoli, Houssein El Dirani, Laurene Youssef, Linda Gianini, Luca Zatti, Francesco Garrisi, Davide Grassani, Camille Petit-Etienne, Erwine Pargon, J. E. Sipe, Marco Liscidini, Corrado Sciancalepore, Daniele Bajoni, Matteo Galli
Summary: The study investigates optical nonlinear processes in linearly uncoupled resonators using a Mach-Zehnder interferometer to effectively decouple and nonlinearly couple two resonators. This approach demonstrates unprecedented control over the interaction of the rings and operates over a wide bandwidth, while significantly increasing photon pair generation efficiency. The research is published under an exclusive license by AIP Publishing.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Tommaso Perani, Marco Liscidini
Summary: Photonic crystal ridge waveguides with guided Bloch surface waves (GBSWs) are a versatile platform for integrated optical devices. However, coupling light from a single-mode optical fiber into GBSWs is challenging. This study investigates the main issues and presents solutions to enhance coupling efficiency without additional fabrication steps, potentially leading to significant improvements compared to previous implementations.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Correction
Optics
Federico Andrea Sabattoli, Linda Gianini, Angelica Simbula, Marco Clementi, Antonio Fincato, Frederic Boeuf, Marco Liscidini, Matteo Galli, Daniele Bajoni
Article
Optics
Thanavorn Poempool, Johannes Aberl, Marco Clementi, Lukas Spindlberger, Lada Vukusic, Matteo Galli, Dario Gerace, Frank Fournel, Jean-Michel Hartmann, Friedrich Schaeffler, Moritz Brehm, Thomas Fromherz
Summary: We have successfully embedded a single SiGe quantum dot (QD) into a bichromatic photonic crystal resonator (PhCR) at the position of maximum modal electric field by optimizing the MBE growth technique. Record quality (Q) factors for QD-loaded PhCRs up to Q ~ 105 have been achieved. Our findings confirm the single QD in the center of the resonator as a potentially novel photon source in the telecom spectral range.
Article
Computer Science, Artificial Intelligence
Davide Cugini, Dario Gerace, Pietro Govoni, Aurora Perego, Davide Valsecchi
Summary: We compare quantum and classical machine learning techniques for the classification of signal and background events in the Vector Boson Scattering processes at the Large Hadron Collider. Quantum machine learning algorithms based on variational quantum circuits perform well on freely available quantum computing hardware, outperforming deep neural networks on classical computing facilities. We demonstrate that quantum neural networks can correctly classify the targeted signal with AUC close to classical neural networks while using fewer resources and less variable data in the training set.
QUANTUM MACHINE INTELLIGENCE
(2023)
Article
Optics
Luca Zatti, J. E. Sipe, Marco Liscidini
Summary: We study the generation of photon pairs through spontaneous four-wave mixing in a structure consisting of two linearly uncoupled resonators. Energy can only be transferred from one resonator to another through a nonlinear interaction. We consider the case of two racetrack-shaped resonators connected by a coupler, and derive analytic expressions for the pair-generation rate. We compare these results with that achievable in a single-ring resonator.
Proceedings Paper
Computer Science, Artificial Intelligence
Francesco Scala, Stefano Mangini, Chiara Macchiavello, Daniele Bajoni, Dario Gerace
Summary: Recently, there have been proposals to implement Quantum Machine Learning (QML) algorithms for the analysis of classical data sets using variational learning means. However, the characterization and analysis of quantum data using these techniques have been limited so far. This work focuses on the implementation of quantum algorithms to classify quantum states defined over a single register of n qubits based on their degree of entanglement. By exploiting the concept of entanglement witness and using Quantum Neural Networks (QNNs), the authors successfully learn how to reproduce the action of an entanglement witness. This work may lead to an efficient combination of QML algorithms and quantum information protocols for analyzing quantum data, potentially surpassing classical approaches.
2022 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN)
(2022)
Article
Materials Science, Multidisciplinary
Simone Zanotti, Hai Son Nguyen, Momchil Minkov, Lucio C. Andreani, Dario Gerace
Summary: This paper presents a formalism for studying the interaction between radiation and matter in multilayered dielectric structures. The theory is based on diagonalization of the generalized Hopfield matrix and includes loss channels in a non-Hermitian formulation. The study reveals the emergence of hybrid elementary excitations named photonic crystal polaritons in these systems, with their dispersion and loss characteristics depending on the material composition and symmetry properties of the lattice. The approach is demonstrated by calculating polariton dispersions in diverse material platforms and discussing their topological properties.
Article
Computer Science, Artificial Intelligence
Stefano Mangini, Alessia Marruzzo, Marco Piantanida, Dario Gerace, Daniele Bajoni, Chiara Macchiavello
Summary: Quantum computing technologies are transitioning from academic research to real industrial applications, demonstrating the first indications of quantum advantage. This study proposes a quantum pipeline that compresses and labels actual industrial data, marking the first attempt to integrate quantum computing procedures into a real industrial pipeline.
QUANTUM MACHINE INTELLIGENCE
(2022)
