Optics - Science topic

Chiral materials display a property called optical activity, which is the capability to interact differentially with left and right circularly polarised light. This leads to the ability to manipulate the polarisation state of light, which has a broad range of applications spanning from energy efficient displays to quantum technologies. Both synthes...

We revisit the resonant break-up of ¹⁹ C on protons at intermediate energies. In this reaction, it was found, for the first time in a halo nucleus to our knowledge, that the cross section was largely dominated by the excitation of the core. In this contribution, we study the robustness of this conclusion against the choice of different optical pote...

We implement the equation of motion of the large-N Gross-Neveu model from strong-interaction physics in photonic waveguide arrays and study one of its paradigmatic multifermion bound-state solutions in an optical experiment. The present study constitutes an important step towards waveguide-based simulations of phenomena relevant for high-energy phy...

We predict a rich excitation spectrum of a binary dipolar supersolid in a linear crystal geometry, where the ground state consists of two partially immiscible components with alternating, interlocking domains. We identify three Goldstone branches, each with first-sound, second-sound or spin-sound character. In analogy with a diatomic crystal, the r...

In optics, the Sasa–Satsuma equation can be used to model ultrashort optical pulses. In this paper higher-order soliton solutions for the Sasa–Satsuma equation with zero boundary condition at infinity are analyzed by $$\bar{\partial }$$ ∂ ¯ method. The explicit determinant form of a soliton solution which corresponds to a single $$p_{l}$$ p l -th o...

Inside an optical Fourier processor, we inserted a varifocal system to continuously magnify the frequency of a master grating. The proposed system does not involve any mechanical compensation for scaling the Fourier spectrum. As the magnification, M, varies, the Fourier spectrum remains at the same initial location. We identified a previously unkno...

In this paper, we concentrate on the higher-order nonlinear Schrödinger-Maxwell-Bloch system with the sextic terms, which could characterize the ultra-short optical pulses in an erbium-doped fiber. Proceeding from the existing Lax pair and one-fold Darboux transformation (DT), we build an N-fold generalized DT with one spectral parameter by means o...

Buku "Model Penerapan Teknologi pada Ruang Udara: Untuk Mendukung Kebijakan Penerbangan Guna Memperkuat Pertahanan dan Keamanan Udara Nasional" menekankan pentingnya penggunaan teknologi dalam konteks pertahanan dan keamanan negara, khususnya dalam pengelolaan ruang udara. Buku ini membahas berbagai aspek terkait dengan perkembangan ilmu penget...

Louis-Sébastien Mercier přišel ještě před Francouzskou revolucí s vizí univerzální kosmopolitní utopie s egalitaristickým právním řádem, ve které bylo možné postavit sochu černému bojovníkovi za zrovnoprávnění ras. Následně Anacharsis Cloots zavrhl vestfálské uspořádání evropské mocenské politiky a přišel s převratnou ideou „univerzálních lidských...

Die im Mathematikunterricht verbreitete Geometrie-Software GeoGebra kann auch zur Modellierung in der Physik verwendet werden. Besonders geeignet sind statische Sachverhalte wie etwa aus der geometrischen Optik und der Elektrostatik. Im Beitrag wird jedoch auch gezeigt, wie sich dynamische Probleme beschreiben lassen, was mit einem erhöhten Aufwand...

Este texto parte da disputa política em torno da revogação ou aprimoramento do Novo Ensino Médio (NEM), política curricular centralizada a nível nacional aprovada no Brasil em um momento de ruptura democrática (2017). Tem por objetivo entender alguns dos caminhos que a reestruturação das políticas públicas para educação vem tomando no Brasil no nov...

The aim of this study was to investigate the influence of the quantity and positioning of feldspathic ceramic specimens inside the furnace on their flexural strength and translucency. The tested hypotheses were that the arrangement of specimens in the furnance would not influence 1) the translucency or 2) the biaxial strength of the porcelain. Meth...

The Flat Spectrum Radio Quasar OP 313 (also known as B2 1308+32) , with coordinates R.A. = 197.619 deg, Decl. = +32.345 deg and redshift z=0.997, has experienced a significant gamma-ray enhanced activity on December 1st, 2023. This follow-up confirms the brightening of the source also in the optical band, with a ~1.6 optical magnitude increase sinc...

We theoretically introduce the method for detecting the atomic vortex (AV) of a helium atomic beam. The AV detection is based on near-field diffraction. The simulations relied on the Feynman path integral. The Gaussian beam and velocity distribution of helium atoms are taken into account. Gravitational field is also included in this study. This res...

Mikro ifade (Mİ), insanların riskli bir ortamda bir olaya karşı istemsiz ve kontrolsüz duygusal tepkilerini gizlemeye çalıştıklarında ortaya çıkan sızıntıdır. Duyguyu yaşayan kişi risk altında bunu bastırmaya çalıştığı için yüze yansıması düşük yoğunlukta, belirli bir bölgede ve çok kısa sürede gerçekleşir. İfade istemsizce ortaya çıktığı için saht...

The widely tunable and high resolution mid-infrared laser based on a BaGa 4 Se 7 (BGSe) optical parametric oscillator (OPO) was demonstrated. A wavelength tuning range of 2.76–4.64 μm and a wavelength tuning resolution of about 0.3 nm were obtained by a BGSe (56.3°, 0°) OPO, which was pumped by a 1064 nm laser. It is the narrowest reported waveleng...

Luminescent nanomaterials with outstanding optical properties have attracted growing interest due to their widespread applications. However, large-scale fabrication of luminescent nanomaterials with desired properties through a simple and economical process...

Gallium phosphide has long held promise for integrated nonlinear photonics, owing to its high non-linear figure of merit, broad transparency and compatibility with silicon. The recent development of orientation patterning in gallium phosphide has now brought this promise within grasp. Current research efforts are focused on demonstrating and evalua...

„Augmented Reality” (erweiterte Realität, kurz AR) ermöglicht die Ergänzung einer realen Umge- bung mit virtuellen Objekten, Einblendungen oder Erläuterungen. So ist eine Simulation von Expe- rimenten in natürlicher Umgebung ohne Abstraktion auf schematische Darstellungen möglich, was die Schüler:innen den realen Ablauf des Experimentierens „begrei...

Artiklen undersøger historisk bevidsthed som begreb i Fælles Mål og tilhørende styredokumenter for historie i den danske grundskole. Artiklen sætter fokus på begrebets funktion og betydningstillæggelse som det umiddelbart iagttages efter indførelsen af kompetencemålsorienteret undervisning i 2014/15. Artiklen er optaget af hvilken betydning det har...

Im Artikel werden Videovignetten zu Lernendenvorstellungen von Schülerinnen und Schülern in der Physik vorgestellt. Die Videovignetten sind eine Möglichkeit, Lehramtsstudierende professionell auf den Umgang mit Lernendenvorstellungen im späteren Unterricht vorzubereiten. Im Rahmen des Projekts VidNuT (Videovignetten in Naturwissenschaft, Technik un...

High-precision making of cube blocks such as cube test mass, corner cube retroreflectors, and right-angle prisms faces the problem of measuring the dihedral-angle error. A new method based on optical differential wavefront sensing for external measurement of dihedral-angle error is proposed in this paper. Compared to conventional methods such as th...

In order to solve the problem of calculating the efficiency of the heliostat distribution, based on the knowledge of physics and astronomy, this paper establishes a variety of physical parameter calculation models, comprehensively considers the relevant data and constraints of the heliostat field, solves and calculates the parameters of the heliost...

High-precision making of cube blocks such as cube test mass, corner cube retroreflectors, and right-angle prisms faces the problem of measuring the dihedral-angle error. A new method based on optical differential wavefront sensing for external measurement of dihedral-angle error is proposed in this paper. Compared to conventional methods such as th...

We present evidence in support of the hypothesis that the young stellar object RNO 54 is a mature-stage FU Ori type source. The star was first cataloged as a “red nebulous object” in the 1980s but appears to have undergone its outburst prior to the 1890s. Present-day optical and near-infrared spectra are consistent with those of other FU Ori-type s...

Me transmetim pa-tela nënkuptojmë transmetimin e informacioneve nëpër ajër me anë të valëve elektromagnetike, pra pa përdorur përçues elektrik ose fije optike. 2.1. Sistemi komunikues pa-tela Në figurën e mëposhtme është treguar modeli i përgjithshëm i sistemit komunikues pa-tela, bazuar në skemen e themeluesit të komunikimeve moderne Claude E. Sha...

When studying the results of the key comparisons of spectral quantities, it appears that in many cases participants’ results systematically deviate from the key comparison reference value over a limited spectral range. We carried out spectral analysis of such deviations in seven key comparisons of optical radiometry. The results reveal an approxima...

The incorporation of heteroatoms into polycyclic aromatic hydrocarbons (PAHs) has been recognized as valuable tool to alter their inherent optical and electrochemical properties and are thought as promising next‐generation semiconductor materials. We herein report the synthesis of diindenopyrene, a fragment of C 70 and two of its nitrogen‐doped aza...

This is a small research article based on child fingerprint data acquisition with two type of fingerprint scanner, optical and thermal. Data presented here are fresh and precious and made both process combined, acqusition and verification. Data are table presentation oriented and have very significant conclusion that is presented. Finally, the...

Recently, significant efforts have been devoted to enable light resonating inside various resonators for long time, leading to high Q factors. Achieving tunability of the free spectral range while maintaining high Q has been, however, challenging.

We demonstrate a Nd : YLF-YVO4 intracavity Raman laser in the 1.5 μm eye-safe region. The fundamental wave at 1314 nm from the end-pumped Nd :YLF is down-converted to 1488 nm, utilizing the 890 cm−1 Raman shift of an YVO4 laser crystal. We use two etalons in the fundamental cavity and Stokes cavity, respectively, to suppress their spectral line wid...

In this manuscript, we design quasi optical Landau Lifshitz electromotive quasi microscales according to quasi frame. Thus, we establish optical binormal electromagnetic Landau Lifshitz microscales by using magnetic optimistic density in quasi Heisenberg space. Also, we receive binormal quasi optical Landau Lifshitz optimistic density in quasi Heis...

Silicon nanoparticles have emerged as pivotal components in nanoscience and nanoengineering due to their inherent characteristics such as high energy capacity and outstanding optical properties. Numerous fabrication and characterization techniques have been researched so far, while a range of applications utilizing them have been developed. In this...

The 9th biennial colloquium on optical wireless communications (OWC) provides one of the biggest forum for researchers, product and system engineers and systems developers to present and discuss their latest research results in the field of OWC. Please submit your papers and looking forward to discuss your new research results from OWC in Rome ;)

The objective of this study is to explore the potential of the Chinese Space Station Telescope (CSST) in asteroid mass determination with asteroid-asteroid close encounters. The CSST is expected to observe some asteroids with an accuracy of several milliarcseconds and has a limiting magnitude of 26 (AB mag) or higher in the g and r bands. By combin...

Optics and Precision Engineering 高速实时近红外弱信号检测系统 朱 强 1， 2 ，周维虎 1， 2 ，陈晓梅 1* ，石俊凯 1 ，李冠楠 1 (1. 中国科学院微电子研究所 光电技术研发中心， 北京 100094； 2. 中国科学院大学 微电子学院， 北京 100049) 摘要： 为了实现对钞券表面涂层高速在线检测， 研制了一种基于高速钞券质量检查机的实时近红外弱信号检测系统。首 先， 根据涂层材料的特性， 采用近红外波段的发光二极管和光电二极管， 研制了驱动和弱信号采集电路； 然后， 利用现场 可编程门阵列和图形化虚拟仪器平台实现了数据的实时传输和处理； 最后， 提出了计算信号峰值强度的峰值标准差法并 分析了该算法的实时性， 进行了钞券表面涂层检测和算法...

Penelitian ini bertujuan untuk mendeskripsikan tingkat hasil belajar IPA pada siswa kelas VIIID SMPN 1 Tempuran tahun pelajaran 2021/2022 setelah pelaksanaan model pembelajaran Discovery learning. Penelitian ini merupakan penelitian tindakan kelas (PTK). Setiap siklus terdiri dari tiga tahap kegiatan, yaitu perencanaan, pelaksanaan tindakan dan obs...

Nanomaterials, which by definition must have at least one of their constituents at the nanoscale, can display unique optical, magnetic, electrical, mechanical, and other properties [...]

A carbon/copper-coated optical fiber was exposed to hydrothermal environments. Hydrogen penetration occurred at the initial stage of exposure and resulted in the formation of an OH-related absorption peak in the optical loss spectrum.

Optical techniques create a great impact in the biomedical field. Recent advances in the optical techniques (advances in photonics, biomaterials, genetic engineering, and nanotechnology) which are currently used in clinical practice to diagnose and treat the disease. In the present review, we highlight the fundamentals of light and its interaction...

A Roll-to-roll technology can enable the fabrication of trench-like photonic meta-structures that are strongly absorptive in the MIR region, providing a controllable optical response for diurnal radiative cooling.

optical measurements

The statistical properties of image pixel brightness were investigated to provide arationale for the choice of the necessary mathematical image model. Video recordings of the ground situation, obtained from the onboard optical-location system of anunmanned aerial vehicle, were generated and analyzed. The requirements foramathematical model of brigh...

Purpose: The aim of the study was to compare distance vision measurements obtained with video oculography (VOG) and an alternate prism cover test (APCT). Design: Single-center, retrospective, and cross-sectional. Methods: Eighty-seven subjects with strabismus were included. All patients underwent an optometric examination. The measurement of stra-b...

The statistical properties of image pixel brightness were investigated to provide a rationale for the choice of the necessary mathematical image model. Video recordings of the ground situation, obtained from the onboard optical-location system of an unmanned aerial vehicle, were generated and analyzed. The requirements for a mathematical model of b...

We investigate the propagation characteristics of Cauchy-Riemann beams in gradient-index media. Our study reveals two key findings: a) the preservation of their form during propagation, and b) surprisingly, the feasibility of obtaining the fractional Fourier transform for any arbitrary entire function. We provide an explicit and straightforward exp...

Seven heterometallic iodoantimonates with general formula (Cat)2{[Sb2M2I10]} (M = Cu(I) (1-6), Ag(I) (7)) were prepared. According to X-ray diffraction data, these compounds are the first Sb(III) representatives of the structural...

In this work, the optical properties of a one-dimensional photonic crystals with defect layer were studied for various photonic crystals and defect layer parameters.

This paper compares two ways of determining the sensitivity of an optical sensor - absolute and relative. The importance of using relative sensitivity for objective comparison of different optical sensors was demonstrated using the example of an optical sensor based on a one-dimensional photonic crystal with a defect. Finally, the parameters that p...

“This a preprint of the Work accepted for publication in «Gyroscopy and Navigation», ©, 2023, Pleiades Publishing, Ltd. http://pleiades.online/ The features of tracking estimators of ground target coordinates and motion parameters in onboard optical positioning systems are considered. The structure of the developed tracking estimator using onboard...

We perform spectral analysis based on a suitable theoretical correlation between V-wave visibility and D-particle distinguishability following the complemen-tarity principle to verify wave-particle duality in the asymmetrical double-slit experiments. The selective interference spectra obtained in the experiments ensure the single-photon approximati...

Neuritis optik merupakan inflamasi dari nervus optikus berupa demyelinasi nervus optikus. Neuritis optik biasanya mengenai usia 16-55 tahun degan rasio perempuan dan pria 2:1. Pada anak cendrung sering terkena bilateral sedangkan dewasa cenderung unilateral. Insidennya 1 sampai 5 per 100.000. Gejala yang sering dikeluhkan pasien yaitu penurunan pen...

Herein, we present deuterated azobenzene photoswitches as a general means of enhancing photopharmacological molecules. Deuteration improves azobenzene performance in terms of light sensitivity, photoswitch efficiency, and photoswitch kinetics with minimal alteration to the underlying structure of the photopharmacological ligand. We report synthesiz...

Ushbu ishda kremniyga Ga va Sb kirishma atomlarini birgalikda diffuziya usulida legirlangan. Kirishma atomlari birgalikda legirlash mobaynida kremniy sirtiga Si1-x(GaSb)x ko'rinishidagi strukturalar xosil bo'lgan. Ushbu strukturalarni kremniyning optik xossasiga ta'siri o'rganilgan.

QKD protocols have inviolability guaranteed by quantum mechanics laws at the current cost of low transmission rates and special optical and optoelectronic devices or complex post-processing tasks. In this work, we introduce a new quantum key distribution protocol that has the simplest optical setup among all QKD protocols already proposed, therefor...

The Galactic black hole GRS 1915+105 exhibits generic High-Frequency Quasi-periodic Oscillations (HFQPOs) at ∼ 67 Hz only during the radio-quiet ‘softer’ variability classes. We present the time-lag properties associated with HFQPOs in the wide energy band (3−60 keV) using all AstroSat observations. For the first time, we detect soft-lag of 6−25 ke...

The accurate evaluation of linearity for an Si photodiode (PD) with respect to the incident optical flux is of great importance to determine a highly accurate range for the absolute optical flux that is more than six orders of magnitude. As such, various evaluation methods of linearity and nonlinearity have been proposed, and their feasibilities ha...

We have conducted long-slit spectroscopic observations and analyzed archival radio data for the ultraluminous X-ray source (ULX) NGC 4861 X-1. Our spectral line analysis unveils NGC 4861 X-1 as the fourth ULX situated within an X-ray photoionized nebula, following three previous findings made approximately two decades ago. Remarkably, we discover N...

The article presents a scientific analysis based on scientific research conducted in the field of solar concentrators in leading institutions of the world. Parabolocylindrical concentrators with a free surface have been shown to be more efficient. concentrator model with free surface shape is proposed and based on its ability to solve problems in t...