arXiv: Optics最新文献_第2页

Inflection point: a new perspective on photonic nanojets 拐点:光子纳米射流的新视角

arXiv: Optics Pub Date : 2020-12-17 DOI: 10.1364/PRJ.419106

Guoqiang Gu, Pengcheng Zhang, Sihui Chen, Yi Zhang, Hui Yang

{"title":"Inflection point: a new perspective on photonic nanojets","authors":"Guoqiang Gu, Pengcheng Zhang, Sihui Chen, Yi Zhang, Hui Yang","doi":"10.1364/PRJ.419106","DOIUrl":"https://doi.org/10.1364/PRJ.419106","url":null,"abstract":"When light propagates through the edge or middle part of microparticle's incoming interface, there is a basic rule that light converges and diverges rapidly or slowly at the output port. These two parts are referred to as region of rapid change (RRC) and region of slow change (RSC), respectively. Finding the boundary point between RRC and RSC is the key to reveal and expound this rule scientifically. Based on the correlation between light convergence-divergence and the slope of emergent light, combined with the relationship between natural logarithm and growth in physical reality and the second derivative of a function in practical significance, we determine the boundary point between RRC and RSC, namely the inflection point. From such perspective, photonic nanojet (PNJ) and near-field focusing by light irradiation on RSC and RRC, as well as the position of the inflection point under different refractive index contrast and the field distribution of light-focusing, are studied with finite-element-method-based numerical simulation and ray-optics-based theoretical analysis. By illuminating light of different field intensity ratios to the regions divided by the inflection point, we demonstrate the generation of photonic hook (PH) and the modulation of PNJ/PH in a new manner.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121940873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

Kelvin's chirality of optical beams 开尔文光束的手性

arXiv: Optics Pub Date : 2020-12-16 DOI: 10.1103/PHYSREVA.103.L031501

S. Nechayev, J. Eismann, R. Alaee, E. Karimi, R. Boyd, P. Banzer

引用次数: 11

Dispersion Scan Frequency Resolved Optical Gating For Evaluation of Pulse Chirp Instability 色散扫描分频光门控对脉冲啁啾不稳定性的评价

arXiv: Optics Pub Date : 2020-12-15 DOI: 10.21203/rs.3.rs-125671/v1

M. Guesmi, P. Veselá, K. Žídek

{"title":"Dispersion Scan Frequency Resolved Optical Gating For Evaluation of Pulse Chirp Instability","authors":"M. Guesmi, P. Veselá, K. Žídek","doi":"10.21203/rs.3.rs-125671/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-125671/v1","url":null,"abstract":"\u0000 The commonly used methods to characterize ultrafast laser pulses, such as frequency-resolved optical gating (FROG) and dispersion scan (d-scan), face problems when they are used on pulses varying within the acquisition time or laser beam. Such chirp variation can be identified by a discrepancy between the measured FROG and d-scan traces and their reconstructed counterparts. Nevertheless, quantification of the instability from the experimental data is a more complex task. In this work, we evaluate the precision of chirp instability quantification based on three different pulse characterization techniques. Two commonly used techniques FROG and d-scan are compared to a new method dispersion scan FROG (D-FROG) that combines the idea of dispersion scanning with the FROG method. We demonstrate the characterization of pulses generated from NOPA together with pulses processed by a 4f-pulse shaper without and with SLM-adjusted phase. In this paper, we validate the performance of the new method to estimate the chirp instability and, therefore, to improve the reconstruction of the measured results. Furthermore, we discuss the instability origin of each measurement case by using fast-scan autocorrelation traces.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114499251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-frequency coherent emission from superstructure thermal emitters 上层建筑热辐射器的多频相干发射

arXiv: Optics Pub Date : 2020-12-15 DOI: 10.1063/5.0048514

Guanyu Lu, M. Tadjer, J. Caldwell, T. Folland

{"title":"Multi-frequency coherent emission from superstructure thermal emitters","authors":"Guanyu Lu, M. Tadjer, J. Caldwell, T. Folland","doi":"10.1063/5.0048514","DOIUrl":"https://doi.org/10.1063/5.0048514","url":null,"abstract":"Long-range spatial coherence can be induced in thermal emitters by embedding a periodic grating into a material supporting propagating polaritons or dielectric modes. However, the emission angle and frequency cannot be defined simultaneously and uniquely, resulting in emission at unusable angles or frequencies. Here, we explore superstructure gratings (SSGs) to control the spatial and spectral properties of thermal emitters. SSGs have long-range periodicity, but a unit cell that provides tailorable Bragg components to interact with light. These Bragg components allow simultaneous launching of polaritons with different frequencies/wavevectors in a single grating, manifesting as additional spatial and spectral bands upon the emission profile. As the unit cell period approaches the spatial coherence length, the coherence properties of the superstructure will be lost. Whilst the 1D k-space representation of the grating provides insights into the emission, the etch depth of the grating can result in strong polariton-polariton interactions. An emergent effect of these interactions is the creation of polaritonic band gaps, and defect states that can have a well-defined frequency and emission angle. In all, our results show experimentally how even in simple 1D gratings there is significant design flexibility for engineering the profile of thermal emitters, bound by finite coherence length.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127820143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Measurements of Polarization Dependencies in Parametric Down-Conversion of X-rays into Ultraviolet Radiation. x射线参量下转换为紫外辐射时偏振依赖性的测量。

arXiv: Optics Pub Date : 2020-12-14 DOI: 10.1103/PhysRevB.104.085207

S. Sofer, O. Sefi, A. Nisbet, S. Shwartz

引用次数: 0

Free electron nonlinearities in heavily doped semiconductors plasmonics 重掺杂半导体等离子体中的自由电子非线性

arXiv: Optics Pub Date : 2020-12-11 DOI: 10.1103/PHYSREVB.103.115305

F. De Luca, M. Ortolani, C. Ciracì

引用次数: 7

Suppression of Surface-Related Loss in a Gated Semiconductor Microcavity 门控半导体微腔中表面相关损耗的抑制

arXiv: Optics Pub Date : 2020-12-09 DOI: 10.1103/PHYSREVAPPLIED.15.044004

D. Najer, N. Tomm, A. Javadi, A. Korsch, B. Petrak, D. Riedel, V. Dolique, S. Valentin, R. Schott, A. Wieck, A. Ludwig, R. Warburton

引用次数: 8

Optical rogue waves in multifractal photonic arrays 多重分形光子阵列中的光学异常波

arXiv: Optics Pub Date : 2020-12-08 DOI: 10.1103/PhysRevB.103.195403

F. Sgrignuoli, Yuyao Chen, S. Gorsky, Weasley A. Britton, L. D. Negro

引用次数: 6

Dielectric microcylinder makes a nanocylindrical trap for atoms and ions 电介质微柱为原子和离子制造了一个纳米圆柱形陷阱

arXiv: Optics Pub Date : 2020-12-08 DOI: 10.1103/PHYSREVB.103.165405

V. Klimov, R. Heydarian, C. Simovski

引用次数: 2

Double-layer metasurface for enhanced photon up-conversion 增强光子上转换的双层超表面

arXiv: Optics Pub Date : 2020-12-07 DOI: 10.1063/5.0040839

P. Manley, M. Segantini, Doğuşcan Ahiboz, M. Hammerschmidt, G. Arnaoutakis, Rowan W. MacQueen, S. Burger, C. Becker

{"title":"Double-layer metasurface for enhanced photon up-conversion","authors":"P. Manley, M. Segantini, Doğuşcan Ahiboz, M. Hammerschmidt, G. Arnaoutakis, Rowan W. MacQueen, S. Burger, C. Becker","doi":"10.1063/5.0040839","DOIUrl":"https://doi.org/10.1063/5.0040839","url":null,"abstract":"We present a double-layer dielectric metasurface obtained by stacking a silicon nanodisc array and a silicon photonic crystal slab with equal periodicity on top of each other. We focus on the investigation of electric near-field enhancement effects occurring at resonant excitation of the metasurface and study its optical properties numerically and experimentally. We find that the major difference in multi-layer metasurfaces when compared to conventional single-layer structures appears to be in Rayleigh-Wood anomalies: they are split into multiple different modes which are themselves spectrally broadened. As a proof of concept we cover a double-layer metasurface with a lanthanide-doped up-conversion particle layer and study its interaction with a 1550 nm photoexcitation. We observe a 2.7-fold enhancemed up-conversion photoluminescence by using the stacked metasurface instead of a planar substrate, although only around 1% of the up-conversion material is exposed to enhanced near-fields. Two mechanisms are identified explaining this behavior: First, enhanced near-fields when exciting the metasurface resonantly, and second, light trapping by total internal reflection in the particle layer when the metasurface redirects light into high-angle diffraction orders. These results pave the way for low-threshold and, in particular, broadband photon up-conversion in future solar energy and biosensing applications.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116820442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9