Optik最新文献 - Book学术

Sub luminal light to super luminal light transition in a double−Λ-system in 87Rb vapor 在87Rb蒸汽中以双- Λ-system的形式发生亚光到超光的转变

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-17 DOI: 10.1016/j.ijleo.2025.172549

Bharti, Joyee Ghosh

{"title":"Sub luminal light to super luminal light transition in a double−Λ-system in 87Rb vapor","authors":"Bharti, Joyee Ghosh","doi":"10.1016/j.ijleo.2025.172549","DOIUrl":"10.1016/j.ijleo.2025.172549","url":null,"abstract":"<div><div>This paper provides a comprehensive examination of Zeeman Electromagnetically Induced Transparency (EIT) in a closed double<span><math><mrow><mo>−</mo><mi>Λ</mi></mrow></math></span> system, with a particular emphasis on the <span><math><msub><mrow><mi>D</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span> transition of <span><math><msup><mrow></mrow><mrow><mn>87</mn></mrow></msup></math></span>Rb. We investigate the impact of magnetic field, probe beam ellipticity, and coupling intensity on atomic system properties considering a circularly polarized (<span><math><msup><mrow><mi>σ</mi></mrow><mrow><mo>±</mo></mrow></msup></math></span>) probe and linearly polarized (<span><math><mi>π</mi></math></span>) coupling beams. The study explores the absorption properties of the system through the peak transmission and EIT width. Furthermore, we also study the dispersive characteristics of the <span><math><msup><mrow></mrow><mrow><mn>87</mn></mrow></msup></math></span>Rb atomic medium, including the group index, group velocity, and group delay of the probe beam, in the presence and absence of a magnetic field for a double<span><math><mrow><mo>−</mo><mi>Λ</mi></mrow></math></span> system. The transmission profile and the rotation of the probe’s polarization are also examined in relation to the probe’s ellipticity and magnetic field. Additionally, the paper emphasizes the process of transitioning from slow light to fast light through the optimization of some parameters including the magnetic field and probe ellipticity considering double<span><math><mrow><mo>−</mo><mi>Λ</mi></mrow></math></span> system.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"341 ","pages":"Article 172549"},"PeriodicalIF":3.1,"publicationDate":"2025-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145323773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Biospeckle PIV (Particle image velocimetry) guided live micro-insect monitoring and tracking 生物散斑PIV（粒子图像测速）技术指导活体微虫监测与跟踪

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-14 DOI: 10.1016/j.ijleo.2025.172556

Mohammad Zaheer Ansari

引用次数: 0

Dual-function analysis of triple unsymmetrical microring resonators for biosensor and optical filter applications 用于生物传感器和光学滤光器的三不对称微环谐振器的双功能分析

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-14 DOI: 10.1016/j.ijleo.2025.172567

Pankaj Kumar Ray, Suman Ranjan

{"title":"Dual-function analysis of triple unsymmetrical microring resonators for biosensor and optical filter applications","authors":"Pankaj Kumar Ray, Suman Ranjan","doi":"10.1016/j.ijleo.2025.172567","DOIUrl":"10.1016/j.ijleo.2025.172567","url":null,"abstract":"<div><div>In this paper, a compact micron-sized triple unsymmetrical microring resonator (TUMRR) using the Vernier effect based optical filter and highly sensitive refractive index (RI) based biosensor for cancer cells detection has been demonstrated. The simulation analysis of dual-function TUMRR as an optical filter is done using MATLAB, and the sensitivity results for cancer cell detection using the refractive index change technique have been obtained in OptiFDTD software. The proposed structure may act as a 1 × 3 input-output optical filter to address high FSR and Q-value. Mathematical modeling to obtain the transfer function for filter analysis is done using delay line signal processing, where a unit delay is modeled as <span><math><msup><mrow><mi>z</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span>. The obtained FSRs for <span><math><mrow><msub><mrow><mi>Tf</mi></mrow><mrow><mn>1</mn></mrow></msub><mo>,</mo><mspace></mspace><msub><mrow><mi>Tf</mi></mrow><mrow><mn>2</mn></mrow></msub><mo>,</mo><mi>and</mi><msub><mrow><mi>Tf</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> are 315 THz, 615 THz, and 835 THz, and the Q-factors are 842, 1338, and 2200, respectively. The reported sensitivity range of the proposed sensor structure is from 150.3 to 167 nm/ RIU.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"340 ","pages":"Article 172567"},"PeriodicalIF":3.1,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Modulation instability analysis in a birefringence FBG structure driven by compete nonlinearities and trapping potential 竞争非线性和俘获势驱动下双折射光纤光栅结构的调制不稳定性分析

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-11 DOI: 10.1016/j.ijleo.2025.172553

Ilanchezhiyan Inbavalli , Murugan Senthil Mani Rajan , Thangavel Alagesan , Kumarappa Subramanian

引用次数: 0

Elliptical contraction vs FitzGerald-Lorentz contraction 椭圆收缩vs菲茨杰拉德-洛伦兹收缩

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-10 DOI: 10.1016/j.ijleo.2025.172555

K. Laghdas, A. Amine, A. Laghdas, C. ElMoustaine

引用次数: 0

Broadband polarization-insensitive achromatic metalens with high focusing efficiency 具有高聚焦效率的宽带偏振不敏感消色差超透镜

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-10 DOI: 10.1016/j.ijleo.2025.172558

Qi Weng , Xuan Ouyang , Yuchen Li , Shihui Fu , Zhenkun Ding , Jia Hu , Jian Shen , Chaoyang Li

{"title":"Broadband polarization-insensitive achromatic metalens with high focusing efficiency","authors":"Qi Weng , Xuan Ouyang , Yuchen Li , Shihui Fu , Zhenkun Ding , Jia Hu , Jian Shen , Chaoyang Li","doi":"10.1016/j.ijleo.2025.172558","DOIUrl":"10.1016/j.ijleo.2025.172558","url":null,"abstract":"<div><div>Broadband achromatic metalenses exhibit significant potential for practical applications due to their superior focusing and imaging performance. Nevertheless, designing achromatic metalenses that simultaneously achieve high focusing efficiency and minimal focal length shift across a wide bandwidth remains an unresolved challenge. In this work, we present a polarization-insensitive achromatic metalens operating in the near-infrared band (1.26–1.66<span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>), composed of annular zinc selenide (<span><math><mi>ZnSe</mi></math></span>) nanopillars on a barium fluoride (<span><math><mrow><mi>Ba</mi><msub><mrow><mi>F</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>) substrate. Numerical simulation results demonstrate that the designed metalens achieves a remarkably small maximum focal shift of merely 2.89 % relative to the designed focal length of 9.4 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>, while maintaining an average efficiency of 79.77 % across the entire operational bandwidth (1.26–1.66 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>). Compared to previously reported near-infrared achromatic metalenses, our design shows significant improvements in suppressing focal shift and enhancing focusing efficiency. Furthermore, the predefined operational bandwidth fully covers the entire optical communication range (1.26–1.625<span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span>), indicating that the proposed achromatic metalens could serve as a promising solution for near-infrared communication systems.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"340 ","pages":"Article 172558"},"PeriodicalIF":3.1,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of optical coherence tomography to determine refractive indices of retinal layers in different organisms 光学相干断层成像的模拟，以确定在不同的生物体视网膜层的折射率

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-10 DOI: 10.1016/j.ijleo.2025.172557

Hassan Pakarzadeh, Masoumeh Gharibshahi

{"title":"Simulation of optical coherence tomography to determine refractive indices of retinal layers in different organisms","authors":"Hassan Pakarzadeh, Masoumeh Gharibshahi","doi":"10.1016/j.ijleo.2025.172557","DOIUrl":"10.1016/j.ijleo.2025.172557","url":null,"abstract":"<div><div>Optical coherence tomography (OCT) is a non-invasive imaging technique that generates two-dimensional (2D) images or three-dimensional (3D) representations of inhomogeneous biological tissues and is widely used in ophthalmology. This study simulates OCT interferograms to extract the refractive indices of retinal layers in humans, monkeys, cows, and dogs. Using a supergaussian light, the refractive indices of key retinal layers including the nerve fiber layer (NFL), inner plexiform and ganglion cell layers (IPL + GCL), inner nuclear layer (INL), outer plexiform layer (OPL), outer nuclear layer and photoreceptor inner segments (ONL + PIS), and photoreceptor outer segments (POS)—are calculated based on predefined layer thicknesses. The simulation results showed that, for example, the refractive indices of the NFL are 1.376, 1.374, 1.380, and 1.355 for human, monkey, cow and dog, respectively. These values are validated by matching the peak positions in the OCT interferograms to the known physical thicknesses of each retinal layer. The proposed method provides a reliable approach for refractive index determination of samples where experimental data are limited.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"340 ","pages":"Article 172557"},"PeriodicalIF":3.1,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334367","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurement of arbitrary apertures by near-field diffraction digital holography and phase-visibility-modulating interferometry 用近场衍射数字全息和相位可视性调制干涉测量任意孔径

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-08 DOI: 10.1016/j.ijleo.2025.172527

Miguel Angel Navarro-Ahuatl, Cruz Meneses-Fabian

{"title":"Measurement of arbitrary apertures by near-field diffraction digital holography and phase-visibility-modulating interferometry","authors":"Miguel Angel Navarro-Ahuatl, Cruz Meneses-Fabian","doi":"10.1016/j.ijleo.2025.172527","DOIUrl":"10.1016/j.ijleo.2025.172527","url":null,"abstract":"<div><div>The lack of generality and accuracy of experimental methods for measuring apertures is a notable problem that has to be addressed. Most of the current approaches measure circular apertures directly using geometric tools. This paper presents a method for calculating the arbitrary shape of apertures with high resolution and accuracy using digital holography and near-field diffraction theory. It applies a back-propagation Fresnel diffraction algorithm to a diffracted optical field of an arbitrary aperture. The complex amplitude of the diffracted field is measured with high resolution and accuracy using the recent automated Phase-Visibility-Modulating Interferometry (PVMI) method. The automated PVMI is implemented in a triple-aperture common-path interferometer (TACPI) and applied for the first time to digital holography. To the best of our knowledge, it has never been used to measure arbitrary apertures with high accuracy and resolution. The TACPI is based on a <span><math><mrow><mn>4</mn><mi>f</mi></mrow></math></span> optical system using a 2D grating in the Fourier plane to recombine three optical beams at the output plane that were present in the input plane. On–off modulation (OOM) is applied to the three beams entering the TACPI to implement the PVMI method. The automation of OOM allows high accuracy and resolution in the so-called automated PVMI. The present approach is explained and demonstrated experimentally for some symmetric and non-symmetric apertures. The measurement uncertainty is 0.01 mm for arbitrary apertures within the diameters <span><math><mrow><mrow><mo>(</mo><mn>1</mn><mo>.</mo><mn>5</mn><mo>,</mo><mn>8</mn><mo>)</mo></mrow><mspace></mspace><mi>mm</mi></mrow></math></span>.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"339 ","pages":"Article 172527"},"PeriodicalIF":3.1,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Twisted THz radiation from a prebunched relativistic electron beam using an ion channel guiding and helical magnetic wiggler 使用离子通道引导和螺旋磁摆动器的预聚束相对论电子束的扭曲太赫兹辐射

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-08 DOI: 10.1016/j.ijleo.2025.172552

Himani Juneja, Anuraj Panwar, Prashant Chauhan

{"title":"Twisted THz radiation from a prebunched relativistic electron beam using an ion channel guiding and helical magnetic wiggler","authors":"Himani Juneja, Anuraj Panwar, Prashant Chauhan","doi":"10.1016/j.ijleo.2025.172552","DOIUrl":"10.1016/j.ijleo.2025.172552","url":null,"abstract":"<div><div>This study explores the enhancement of twisted terahertz (THz) radiation power by using a novel approach leveraging a relativistic electron beam modulated by twisted lasers. The modulated beam propagates through a helical magnetic wiggler and ion channel guiding that induces a transverse modulation in the electron density. The magnetic wiggler deflects the electron trajectories resulting in the emission of THz photons with a twisted phase structure. Our numerical results reveal a significant increase in THz power with rising ion channel frequency, peaking at a critical point where resonance is approached. Furthermore, we observe that maximum THz power is tunable with introduction of ion channel density and relativistic electron beam velocity. In present study, ion channeling also improves the twisted THz radiation power to the order of ∼ <span><math><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>2</mn><mspace></mspace></mrow></msup></math></span>corresponding to beam energy of <span><math><mrow><mn>1.64</mn><mi>MeV</mi></mrow></math></span> approximately, which increase by nearly order of magnitude compared to previously reported values.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"340 ","pages":"Article 172552"},"PeriodicalIF":3.1,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145270999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of Q-switched and mode-locked fiber lasers using tin phthalocyanine absorber 利用酞菁锡吸收体调q锁模光纤激光器的实验研究

IF 3.1 3区物理与天体物理

Optik Pub Date : 2025-10-06 DOI: 10.1016/j.ijleo.2025.172554

Daniel A. Zainal , Nurul Izzah S. Wadi , Sameer Salam , Ahmad Haziq A. Rosol , Latifah S. Supian , Muhammad Imran M.A. Khudus , Ahmad Shuhaimi A. Bakar

{"title":"Experimental investigation of Q-switched and mode-locked fiber lasers using tin phthalocyanine absorber","authors":"Daniel A. Zainal , Nurul Izzah S. Wadi , Sameer Salam , Ahmad Haziq A. Rosol , Latifah S. Supian , Muhammad Imran M.A. Khudus , Ahmad Shuhaimi A. Bakar","doi":"10.1016/j.ijleo.2025.172554","DOIUrl":"10.1016/j.ijleo.2025.172554","url":null,"abstract":"<div><div>We present an experimental investigation of a Q-switched and mode-locked erbium-doped fiber laser (EDFL) utilizing tin phthalocyanine (SnPc) as a saturable absorber (SA). The SnPc solution, deposited on the end face of a fiber ferrule connector, exhibits a notable modulation depth of 19.4 %. This passive SA device was incorporated into the EDFL cavity to generate Q-switched pulses at a center wavelength of 1561.8 nm. With pump powers ranging from 12.13 to 67.52 mW, the repetition rate and pulse width varied from 21.85 kHz / 12.16 µs to 58.34 kHz / 6.32 µs. The Q-switched laser demonstrated an efficiency of up to 9.16 %, with a peak output power of 5.9 mW. A signal-to-noise ratio (SNR) of 57.02 dB confirmed stable Q-switching operation. Upon extending the EDFL cavity to 162 m, stable mode-locked pulses of 5.05 ps were achieved with pump powers exceeding 85.99 mW. At 210.62 mW pump power, the mode-locked output exhibited a repetition rate of 1.28 MHz, a maximum pulse energy of 1.63 nJ, and a peak power of 0.28 kW. The frequency spectrum demonstrated a high SNR of 66.70 dB, verifying stable mode-locking performance. Operating at 1559.8 nm, this picosecond pulse train holds significant potential for applications such as frequency comb generation, high-precision optical metrology, and broadband absorption spectroscopy. These results highlight the promise of SnPc organic materials as efficient saturable absorbers for future photonic applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"339 ","pages":"Article 172554"},"PeriodicalIF":3.1,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0