Optik最新文献_第10页

Polarization encoded optical encryption enhanced with Radon transform

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-23 DOI: 10.1016/j.ijleo.2024.172186

Preeti Sharma , Bhaskar Kanseri , Kehar Singh

引用次数: 0

Domain-wall dark pulse emission in mode-locked fiber laser with Ta2AlC absorber

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-22 DOI: 10.1016/j.ijleo.2024.172192

Ruven Rhaj Naidu , Aeriyn D. Ahmad , Masruroh , Muhammad Imran M.A. Khudus , Kaharudin Dimyati , Retna Apsari , Sulaiman Wadi Harun

引用次数: 0

The multilayer cluster micro-sphere biosensor for single nanoparticle detection by using WGM excitation

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-21 DOI: 10.1016/j.ijleo.2024.172194

Fatemeh aghaei , Saeed Golmohammadi , Hadi Soofi , Hamid Bahador , Iraj Ahadzadeh

{"title":"The multilayer cluster micro-sphere biosensor for single nanoparticle detection by using WGM excitation","authors":"Fatemeh aghaei , Saeed Golmohammadi , Hadi Soofi , Hamid Bahador , Iraj Ahadzadeh","doi":"10.1016/j.ijleo.2024.172194","DOIUrl":"10.1016/j.ijleo.2024.172194","url":null,"abstract":"<div><div>The biological properties of Whispering-Gallery-Mode (WGM) -based biosensors have improved significantly in recent years. This work presents a new structure for WGM-based biosensors in the operating wavelength range of 450 nm to 550 nm. The structure provided consists of different metal-semiconductor layers on a spherical SiO<sub>2</sub> substrate. The proposed structure uses spherical silver nanoparticles on the graphene layers to strengthen the evanescent field profile. We show that the interaction of WGM evanescent field with analytes leads to the absorption of these particles at the resonator's surface. Also, the six-layer graphene in this structure has improved the sensitivity of the biosensor to biological factors. This proposed sensor has the ability to identify virus particles and single proteins with small dimensions, including the protein S and bovine serum albumin (BSA). It is worth mentioning that the S protein is present in the biological structure of the coronavirus. 3D finite-difference time-domain (FDTD) method was used to analyze the effect of proposed solutions on optical performance such as resonance wavelength shift and relative electric field intensity. The structure without silver nanoparticles has a wavelength shift of 0.36 nm and an electric field intensity of 6.8. But these values increase to 0.98 nm and 12.5 respectively in the presence of silver nanoparticles. Also, Fabrication method is described in details.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172194"},"PeriodicalIF":3.1,"publicationDate":"2024-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162554","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

Optical properties of dentin and enamel by spectroscopic ellipsometry

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-20 DOI: 10.1016/j.ijleo.2024.172185

Vitória M. Castilho , Adriana M. Nunes , Leonardo S. Barroso , Ladario da Silva , José A.O. Huguenin

{"title":"Optical properties of dentin and enamel by spectroscopic ellipsometry","authors":"Vitória M. Castilho , Adriana M. Nunes , Leonardo S. Barroso , Ladario da Silva , José A.O. Huguenin","doi":"10.1016/j.ijleo.2024.172185","DOIUrl":"10.1016/j.ijleo.2024.172185","url":null,"abstract":"<div><div>The aim of this study was to explore the extinction coefficient and refractive index of dentin and enamel from human teeth of different anatomical categories and individuals over a wide range of wavelengths. We carried out spectroscopic ellipsometry measurements on dentin and enamel in their natural geometry, investigating three groups of teeth <em>in vitro</em>. The refractive index (<span><math><mi>n</mi></math></span>) and extinction coefficient (<span><math><mi>k</mi></math></span>) were accessed for the <span><math><mrow><mn>400</mn><mo>−</mo><mn>1000</mn><mspace></mspace><mi>n</mi><mi>m</mi></mrow></math></span> range. The results indicate that in the infrared we have lower absorption for some specific wavelengths, while the refractive index shows practically constant behavior. We observed a significant decrease in the extinction coefficient in the <span><math><mrow><mn>815</mn><mo>−</mo><mn>825</mn><mspace></mspace><mi>n</mi><mi>m</mi></mrow></math></span> and <span><math><mrow><mn>875</mn><mo>−</mo><mn>885</mn><mspace></mspace><mi>n</mi><mi>m</mi></mrow></math></span> ranges, even for different geometries and individuals, indicating that this wavelength range is more for suitable laser interaction with teeth <em>in vivo</em> to avoid heating and teeth damage. In recent years, several optical studies have been proposed for dental diagnosis, including backscattering and transillumination. However, to the best of our knowledge, a detailed study on optical properties such as refractive index <span><math><mi>n</mi></math></span> and extinction coefficient <span><math><mi>k</mi></math></span> for human dentin and enamel is lacking in the literature.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172185"},"PeriodicalIF":3.1,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162354","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

Low-voltage electrophoretic deposition of silver nanoparticles on ZnO nanorods thin films for enhanced visible-light photocatalysis

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-20 DOI: 10.1016/j.ijleo.2024.172179

Kittiyaporn Singsumphan , Cheewita Suwanchawalit , Wisit Somsorod , Thanaree Sripathomkul , Pattanawit Sawanglap , Kamon Aiempanakit , Montri Aiempanakit

{"title":"Low-voltage electrophoretic deposition of silver nanoparticles on ZnO nanorods thin films for enhanced visible-light photocatalysis","authors":"Kittiyaporn Singsumphan , Cheewita Suwanchawalit , Wisit Somsorod , Thanaree Sripathomkul , Pattanawit Sawanglap , Kamon Aiempanakit , Montri Aiempanakit","doi":"10.1016/j.ijleo.2024.172179","DOIUrl":"10.1016/j.ijleo.2024.172179","url":null,"abstract":"<div><div>This study focuses on developing visible-light-driven photocatalytic thin films using silver nanoparticle-modified zinc oxide (Ag-ZnO) nanorods. The thin films were prepared using a straightforward electrophoretic deposition method to find the optimal condition, with deposition voltages ranging from 0 to 20 V. Among the samples, the 2V-Ag-ZnO nanorods showed the highest efficiency in degrading indigo carmine dye under visible light. Characterization of the samples confirmed uniform growth of the ZnO nanorods and successful surface modification with Ag nanoparticles. Optical analysis demonstrated that the presence of Ag nanoparticles improved light absorption in the visible range due to the surface plasmon resonance effect, which also helped reduce the recombination of electron-hole pairs. This resulted in better photocatalytic performance compared to unmodified ZnO. Although the reusability tests showed a gradual decrease in photocatalytic efficiency after 4 cycles, the 2V-Ag-ZnO nanorods still performed better than the unmodified ZnO, indicating the benefits of surface modification. The findings suggest that Ag-ZnO nanorod thin films are promising photocatalysts for environmental applications, such as dye degradation, and that electrophoretic deposition is an effective, simple method for fabricating such materials.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172179"},"PeriodicalIF":3.1,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162355","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

Inverse design method of power beam splitter based on particle swarm optimization and grayscale QR codes

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-19 DOI: 10.1016/j.ijleo.2024.172184

Zhibin Wang, Jiutian Zhang, ZhengYang Li

引用次数: 0

Near infrared emission in garnet structured LiCa3MgV3O12:Nd3+/Yb3+ phosphor

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-19 DOI: 10.1016/j.ijleo.2024.172180

Gopal N. Warutkar , N.S. Ugemuge , Ashvini Pusdekar , Shruti Dhale , Khushbu Sharma , Babasaheb.R. Sankapal , Shilpa Kulkarni , S.V. Moharil

{"title":"Near infrared emission in garnet structured LiCa3MgV3O12:Nd3+/Yb3+ phosphor","authors":"Gopal N. Warutkar , N.S. Ugemuge , Ashvini Pusdekar , Shruti Dhale , Khushbu Sharma , Babasaheb.R. Sankapal , Shilpa Kulkarni , S.V. Moharil","doi":"10.1016/j.ijleo.2024.172180","DOIUrl":"10.1016/j.ijleo.2024.172180","url":null,"abstract":"<div><div>Nd<sup>3+</sup>/Yb<sup>3+</sup> singly as well as co-doped LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> vanadate phosphors producing Near Infrared (NIR) emission have been synthesized using a traditional solid-state reaction route. Diffraction patterns of LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> recorded via Powder X-ray Diffraction (PXRD) and confirmed polycrystalline nature with space group Ia<span><math><mover><mrow><mn>3</mn></mrow><mo>̅</mo></mover></math></span>d corresponds to cubic crystal structure. Surface and elemental mapping have been performed by using SEM and EDX analysis. The investigation of Nd<sup>3+</sup>doped LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> focused on analysing its excitation and emission spectra. By stimulating host material ultraviolet (UV)region with excitation wavelength of 340 nm, the phosphor containing Nd<sup>3+</sup> in LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> exhibited a highly efficient NIR emission at 1069 nm when. In Yb<sup>3+</sup>doped LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub>, a successful demonstration of converting UV light into NIR emission was achieved through down-conversion across a wide spectrum from [VO<sub>4</sub>]<sup>3−</sup> to Yb<sup>3+</sup> ions. Upon UV excitation, a strong emission in NIR region, at approximately 1000 nm was observed which well aligns with the wavelength sensitivity of silicon solar cells. The intensities of NIR emission in the Nd<sup>3+</sup>-Yb<sup>3+</sup> co-doped LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> phosphor exhibited significant enhancement when compared to the singly doped Nd<sup>3+</sup>/Yb<sup>3+</sup> samples. LiCa<sub>3</sub>MgV<sub>3</sub>O<sub>12</sub> vanadate phosphors are highly suitable for solid-state lasers and various significant optical applications.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172180"},"PeriodicalIF":3.1,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162357","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

Design and analysis of 2D photonic crystals biosensor based on a dual-cavity for brain tissue detection

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-18 DOI: 10.1016/j.ijleo.2024.172160

Mohammed Boulesbaa , Boualem Mekimah , Amira Guermache

{"title":"Design and analysis of 2D photonic crystals biosensor based on a dual-cavity for brain tissue detection","authors":"Mohammed Boulesbaa , Boualem Mekimah , Amira Guermache","doi":"10.1016/j.ijleo.2024.172160","DOIUrl":"10.1016/j.ijleo.2024.172160","url":null,"abstract":"<div><div>In this work, a new 2D photonic crystal (PhC) based biosensor is designed to be used in detecting blood molecules. The proposed structure consists of a square array of silicon (Si) rods having a refractive index of 3.5 RIU within an air background of 1 RIU. A rectangular-shaped dual-cavity, coupled to a principal waveguide, is designed. The photonic bandgap (PBG) is calculated using the plane wave expansion (PWE) method. Two wavelength ranges are covered in TE polarization. The first one is located between 864 nm and 954 nm and the second one is between 1242 nm and 1847 nm; covering the two optical windows of 1300 nm and 1550 nm. The transmission spectrum is performed based on the finite difference time domain (FDTD) method. Brain tissue detection is studied and analyzed using the proposed biosensor. The detection principle is based on detecting the changes in the refractive index of molecules. Actually, wavelength undergoes a shift in response to a change in the refractive index, within 1 up to 1.4833 RIU. The results show that the proposed biosensor exhibits a dual-sensitivity behavior with regard to both resonant wavelength and transmission intensity. The sensitivity in resonant wavelength (<span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>o</mi></mrow></msub></math></span>) reaches a peak value of 79.03 nm/RIU with Metastasis. Furthermore, a linear positive correlation between transmission intensity and refractive index variation is achieved with a high sensitivity (<span><math><msub><mrow><mi>S</mi></mrow><mrow><mi>I</mi></mrow></msub></math></span>) of 285.44%/RIU. Indeed, the sensor shows a high selectivity capability in distinguishing between different brain tissues based on the shift in transmission intensity.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172160"},"PeriodicalIF":3.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162206","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

Electron spin states embedded in localized states for opening spin levels effect in silicon nanowires doped with impurities

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-12-18 DOI: 10.1016/j.ijleo.2024.172181

Wei-Qi Huang , Yin-Lian Li , Zhong-Mei Huang , Hao-Ze Wang , Shi-Rong Liu

{"title":"Electron spin states embedded in localized states for opening spin levels effect in silicon nanowires doped with impurities","authors":"Wei-Qi Huang , Yin-Lian Li , Zhong-Mei Huang , Hao-Ze Wang , Shi-Rong Liu","doi":"10.1016/j.ijleo.2024.172181","DOIUrl":"10.1016/j.ijleo.2024.172181","url":null,"abstract":"<div><div>We measure a dramatic increase of spin states splitting in the localized states in silicon [001] nanowire doped with impurities. To verify the opening spin levels effect, we conduct fine IV measurements under laser irradiation, and observe their change under magnetic field in the novel photo-electron conductivity detection. A strong spin oscillation occurs in the fine IV measurement of oxygen doped nanowires only under a laser illumination at wavelength of 633 nm. In room temperature photo-luminescence, the spin splitting of the emission peaks is dramatically opened to spin gap of 140 meV. These behaviors are attributed to the spin states embedded in the localized states. This hypothesis can be supported by an atomic model of coupling between the spin states and the localized states in the first principle simulation platform. We believe the incorporation of oxygen in silicon nanowire leads symmetry broken which is heavily dependent on the silicon nanostructure. Our simulation reveals that splitting of the electronic spin levels as large as 320 meV can be obtained in the localized states of Si<img>O double bond. The formula is found to describe the relationship between the opening gap of spin levels splitting and the symmetry broken degree.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"322 ","pages":"Article 172181"},"PeriodicalIF":3.1,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143162356","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

Weak mode locking dynamics in a thulium-doped fiber laser 掺铥光纤激光器的弱锁模动力学

IF 3.1 3区物理与天体物理

Optik Pub Date : 2024-11-26 DOI: 10.1016/j.ijleo.2024.172153

L.M. Gonzalez-Vidal , O. Pottiez , L.A. Rodriguez-Morales , H.E. Ibarra-Villalon , M. Bello-Jimenez , J.P. Lauterio-Cruz , J.C. Hernandez-Garcia

{"title":"Weak mode locking dynamics in a thulium-doped fiber laser","authors":"L.M. Gonzalez-Vidal , O. Pottiez , L.A. Rodriguez-Morales , H.E. Ibarra-Villalon , M. Bello-Jimenez , J.P. Lauterio-Cruz , J.C. Hernandez-Garcia","doi":"10.1016/j.ijleo.2024.172153","DOIUrl":"10.1016/j.ijleo.2024.172153","url":null,"abstract":"<div><div>In this work, we study partial mode locking dynamics in a figure-eight thulium-doped fiber laser. With this particular laser design, which includes a long, highly power-imbalanced NOLM, two regimes are successively identified as pump power is raised, both characterized by a narrow-linewidth emission consisting of broad periodic pulses emerging from a dominant background radiation. In each case, peculiar dynamics are identified. In the first regime, the pulses undergo dynamical evolution at two different time scales: at the scale of hundreds of cycles, a slow quasi-periodic modulation affects both the pulse intensity and temporal position, whereas at the scale of the pulse duration, the inner details of its complex profile are found to drift under the pulse envelope. These phenomena are interpreted in terms of slow and fast gain dynamics, respectively. In the second regime, the waveform displays large Q-switched-like oscillations whose details reveal both the peak power clamping effect of the NOLM nonlinear transmission and competition between the pulse and the spurious background radiation. Finally, reducing pump power yields a quasi-continuous-wave regime in which the temporal waveform displays a self-imaging effect, as complex features in the temporal map repeat with a periodicity of 4.81 cavity cycles. Such behavior strongly contrasts with the stochasticity expected for this type of regime. These results illustrate the complex operation of long thulium-doped fiber lasers producing pulses in the 2-micron region, which are attractive for fundamental research, and also for applications such as surgery.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"321 ","pages":"Article 172153"},"PeriodicalIF":3.1,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142742995","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