Article
Optics
Alexander A. Milner, Valery Milner
Summary: This study demonstrates a method for varying the directionality of laser-induced molecular rotation by changing the polarization ellipticity of the laser field in an optical centrifuge. The results show that the degree of rotational directionality can be continuously adjusted between unidirectional and bidirectional rotation without significant loss in the total number of rotating molecules. This technique could be applied to study the effects of molecular angular momentum orientation on collisions and reactions, as well as for controlling magnetic and optical properties of gases and enantioselective detection of chiral molecules.
Article
Optics
Mohammad Rashidi, Ziyuan Li, Chennupati Jagadish, Sudha Mokkapati, Hark Hoe Tan
Summary: Random lasers are simpler and cost-effective to fabricate compared to traditional Fabry-Perot cavities. By changing the design parameters of the random InP nanowire arrays, the properties of the lasing modes can be controlled, including the number of modes, lasing wavelengths, and lasing threshold.
Article
Engineering, Electrical & Electronic
Zainul Aabdin, Tanmay Ghosh, Antoine Pacco, Sanoj Raj, Hue Thi Bich Do, Khakimjon Saidov, Weng Weei Tjiu, Utkarsh Anand, Petr Kral, Frank Holsteyns, Michel Bosman, Utkur Mirsaidov
Summary: This study demonstrates the ability to control the etching direction of silicon crystal planes through mechanical agitation of the etchant. Through molecular dynamics simulations, it was found that the Si(OH)4 etch byproducts have a higher affinity to the Si {110} planes, leading to the switching of the etch anisotropy.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Optics
Milo W. Hyde
Summary: This paper presents a method for independently controlling the field and irradiance statistics of a partially coherent beam. By including control over irradiance statistics in addition to the cross-spectral density function, this method expands existing synthesis approaches and enables the design, modeling, and simulation of new partially coherent beams. The expressions derived in the paper relate the ensemble moments of the fields to those of the desired partially coherent beam, allowing for the generation of random optical field realizations with proper statistics and validation of the technique through comparison with theoretical results.
Article
Chemistry, Physical
Renat Sh. Ikhsanov, Igor E. Protsenko, Igor V. Smetanin, Nikolay V. Nikonorov, Alexander V. Uskov
Summary: The concepts of local and global photoemission directivity patterns for plasmonic nanoparticles of arbitrary shape are introduced, and their relationship is established. Formulas for the local photoemission directionality pattern are obtained for different mechanisms and field distributions in plasmonic modes inside nanoparticles. The calculated patterns for spherical nanoparticles with excited dipole or quadruple plasmonic modes show qualitative differences between surface and volume photoemission, and also among different plasmonic modes. These findings have potential applications in various plasmonic devices and technologies, including nanostructured photocathodes, photodetectors, and plasmonic photocatalysis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Optics
E. Mendicuti, O. Kaeferlein, C. Garcia-Segundo
Summary: This study introduces a proof of concept for multimode random laser emission using fresh whole blood, showing that blood can emit laser under specific conditions. The experimental results demonstrate that the laser emission characteristics of blood are similar to traditional laser media.
Article
Optics
Z. H. E. N. G. Wang, L. E. Yu, Y. I. B. I. Yang, P. E. N. G. F. E. Ma, L. A. N. G. L. I. N. Cui, S. H. U. A. Luo, Z. H. I. M. I. N. Ji, Z. H. I. G. A. N. G. Song, Y. A. N. M. E. Su, J. I. A. O. Q. I. N. G. Pan, P. E. N. G. F. E. Wang, Y. E. J. I. N. Zhang
Summary: Light detection and ranging (LiDAR) is a widely used technology for extracting information from the outside world, and optical phased array (OPA) is a promising solution for LiDAR. However, OPA is limited by loss and alias-free steering range. This paper proposes a dual-layer antenna and a 256-channel non-uniform OPA, achieving high directionality and alias-free steering.
Article
Chemistry, Multidisciplinary
Jiaxi Xu, Jiayi Wang, Osman M. Bakr, Nikos Hadjichristidis
Summary: We synthesized aggregation-induced emission (AIE) polymers with unchanged emission wavelength/color through ring-opening (co)polymerizations. The chemical structures/physical properties of the (co)polymers were characterized by NMR, SEC, MALDI-TOF, and DSC. The co-polyether microstructures were studied by calculating reactivity ratios and visualized by Monte Carlo simulation. The fluorescence performance was systematically correlated with molecular weights, crystallinity, monomer compositions, glass transition temperatures, side lengths, and flexibility/rigidity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Binoy K. Saha, Ragima V. P. Veluthaparambath, Vibha G. Krishna
Summary: Halogen interaction is a controversial and important topic in crystal engineering and supramolecular chemistry, involving F, Cl, Br, and I. Lighter and heavier halogens behave differently, and the nature of the interaction depends on the atom covalently bonded to the halogens. This review discusses different types of homo-halogen, hetero-halogen, and halogen-halide interactions, their natures, preferred geometries, as well as various motifs and interchangeability with other functional groups. The review also mentions important applications of halogen interactions.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Physics, Applied
Adawiya J. J. Haider, Fatima I. I. Sultan, Mohammed J. J. Haider, Bakr Ahmed Taha, Sharafaldin Al-Musawi, Mahdi S. Edan, Chadeer S. S. Jassim, Norhana Arsad
Summary: This paper investigates the influence of two-shaped nanoparticles as scatter centers on the performance emission of a random laser. The optimal nanocomposite film concentrations were found to be 10(-4) M for R6G dye and 0:184 x 10(13) cm(-3) for ZnO NPs. The ZnO NW nanocomposite film exhibited a FWHM of 13nm at a threshold energy of 8.65mJ, while the ZnO NF nanocomposite film had a FWHM of 11nm and a threshold energy of 4.8mJ.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2023)
Article
Multidisciplinary Sciences
Quinten A. Akkerman, Tan P. T. Nguyen, Simon C. Boehme, Federico Montanarella, Dmitry N. Dirin, Philipp Wechsler, Finn Beiglbock, Gabriele Raino, Rolf Erni, Claudine Katan, Jacky Even, Maksym V. Kovalenko
Summary: In this study, the authors report a room-temperature synthesis method for monodisperse, isolable, spheroidal APbBr3 QDs. By controlling the equilibrium between the precursor and the solute, as well as the kinetics of nucleation and growth, size tunable QDs were obtained.
Article
Physics, Multidisciplinary
Biswajit Das, Shuvojit Paul, Sreekanth K. Manikandan, Ayan Banerjee
Summary: Active fluctuations play an important role in the intracellular transport of passive objects, while the influence of viscoelasticity in shaping these processes is less understood. In a minimal experiment using a driven colloid in a viscoelastic bath, we found that viscoelasticity significantly increased the mean injected power to the passive object and reduced negative work fluctuations. These findings suggest an enhanced directionality in driven processes within a viscoelastic bath.
NEW JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hamza Abudayyeh, Annika Mildner, Dror Liran, Boaz Lubotzky, Lars Lueder, Monika Fleischer, Ronen Rapaport
Summary: Deterministic GHz-rate single photon sources at room temperature were achieved by using a complex monolithic photonic resonator and a circular Bragg antenna, which resulted in a 20-fold emission rate enhancement and record-high directionality, showing great potential for ultrafast light-matter interfaces for quantum technologies.
Article
Physics, Multidisciplinary
Jiaqi Hu, Zhaorong Wang, Seonghoon Kim, Hui Deng, Sebastian Brodbeck, Christian Schneider, Sven Hofling, Nai H. Kwong, Rolf Binder
Summary: By using a microcavity with strong polarization selectivity, researchers observed a fermionic gain mechanism underlying polariton laser, which is consistent with an open-dissipative-pumped system analog of a polaritonic BCS state.
Article
Energy & Fuels
Ruiguang Yu, Jie Liu, Wenkai Liang, Biao Ma, Hewu Wang
Summary: Through detailed chemical kinetics calculations, a comprehensive computational investigation is conducted to observe the negative temperature coefficient (NTC) behavior of the explosion limit of propane. The study reveals distinct thermodynamic and chemical kinetic characteristics of the lower turning point under different conditions. The results also show that the competition between chain termination reactions and chain branching/propagation reactions determines the lower turning point in the negative temperature coefficient region.
Article
Optics
Emilio Ignesti, Federico Tommasi, Lorenzo Fini, Stefano Cavalieri
OPTICS COMMUNICATIONS
(2016)
Article
Optics
Federico Tommasi, Emilio Ignesti, Lorenzo Fini, Stefano Cavalieri
Article
Multidisciplinary Sciences
Emilio Ignesti, Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Niccolo Azzali, Stefano Cavalieri
SCIENTIFIC REPORTS
(2016)
Article
Optics
Federico Tommasi, Emilio Ignesti, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalier
Article
Optics
Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
OPTICS COMMUNICATIONS
(2020)
Article
Chemistry, Analytical
Federico Tommasi, Baptiste Auvity, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
Summary: Optical sensors research has been driven by the need for low-cost and non-invasive detection strategies. The invention of random lasers has provided opportunities for exploring new possibilities in sensing and amplification of signals. The improved setup using optical fibers, a reference sensor, and a peristaltic pump aims to enhance portability, stability, and ease of use in measuring liquid scattering.
Article
Multidisciplinary Sciences
Fabrizio Martelli, Federico Tommasi, Angelo Sassaroli, Lorenzo Fini, Stefano Cavalieri
Summary: This work presents a method for verifying the accuracy of Monte Carlo codes by using the law of average path length invariance. The method can assess the effectiveness of the code in complex media and detect inaccuracies in boundary treatment. It is applicable to various scattering and geometrical properties of the medium, providing a fundamental tool for code verification in specific geometries.
SCIENTIFIC REPORTS
(2021)
Article
Biochemical Research Methods
Angelo Sassaroli, Federico Tommasi, Stefano Cavalieri, Lorenzo Fini, Andre Liemert, Alwin Kienle, Tiziano Binzoni, Fabrizio Martelli
Summary: This study proposes a verification method for Monte Carlo (MC) codes based on analytical benchmarks to assess the accuracy of photon trajectory generation and intersection with boundaries. The accuracy of the verification increases with the number of simulated trajectories.
JOURNAL OF BIOMEDICAL OPTICS
(2022)
Article
Biochemical Research Methods
Angelo Sassaroli, Federico Tommasi, Stefano Cavalieri, Fabrizio Martelli
Summary: In this paper, an alternative method for assessing the mean fluence rate of photons in biomedical optics is proposed and analytically demonstrated. Instead of calculating the power deposited by absorbed photons in a sub-volume, the method evaluates the mean pathlength traveled by all the photons inside the sub-volume. It improves the statistics and convergence of Monte Carlo simulations, even in cases of zero absorption coefficient or non-constant spatial distribution of the absorption coefficient.
BIOMEDICAL OPTICS EXPRESS
(2023)
Article
Multidisciplinary Sciences
Federico Tommasi, Lorenzo Fini, Stefano Focardi, Fabrizio Martelli, Giacomo Santini, Stefano Cavalieri
Summary: Random walks are a common phenomenon in nature and can be observed in various contexts. These phenomena are predicted to share a common feature called Invariance Property (IP). In this paper, the IP in a virtual medium inside an open environment is studied by analyzing the movements of the grazer mollusc Acanthopleura granulata. The results deviate from the predictions made by the IP, indicating the influence of the dimension of the medium and the characteristics of animal movements.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
Proceedings Paper
Engineering, Electrical & Electronic
Federico Tommasi, Emilio Ignesti, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
OPTICAL SENSORS 2019
(2019)
Article
Optics
Federico Tommasi, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
Proceedings Paper
Engineering, Electrical & Electronic
Federico Tommasi, Emilio Ignesti, Lorenzo Fini, Fabrizio Martelli, Stefano Cavalieri
OPTICAL SENSORS 2017
(2017)
Article
Optics
Federico Tommasi, Lorenzo Fini, Emilio Ignesti, Stefano Lepri, Fabrizio Martelli, Stefano Cavalieri
