arXiv: OpticsPub Date : 2020-08-09DOI: 10.37190/OA210105
I. Rondón, F. Soto-Eguibar
{"title":"Orbital angular momentum due to modes interference","authors":"I. Rondón, F. Soto-Eguibar","doi":"10.37190/OA210105","DOIUrl":"https://doi.org/10.37190/OA210105","url":null,"abstract":"We present generalized expressions to calculate the orbital angular momentum for invariant beams using scalars potentials. The solutions can be separated into transversal electric TE, transversal magnetic TM and transversal electromagnetic TE/TM polarization modes. We show that the superposition of non-paraxial vectorial beams with axial symmetry can provide a well defined orbital angular momentum and that the modes superposition affects the angular momentum flux density. The results are illustrated and analyzed for Bessel beams.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116698598","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}
arXiv: OpticsPub Date : 2020-08-08DOI: 10.1063/5.0024511
N. Carvalho, R. Benevides, M. Ménard, G. Wiederhecker, N. Frateschi, T. Alegre
{"title":"High-frequency GaAs optomechanical bullseye resonator","authors":"N. Carvalho, R. Benevides, M. Ménard, G. Wiederhecker, N. Frateschi, T. Alegre","doi":"10.1063/5.0024511","DOIUrl":"https://doi.org/10.1063/5.0024511","url":null,"abstract":"The integration of optomechanics and optoelectronics in a single device opens new possibilities for developing information technology and exploring fundamental phenomena. Gallium arsenide is a well-known material that can bridge the gap between the functionalities of optomechanical devices and optical gain media. Here, we experimentally demonstrate a high-frequency GaAs optomechanical resonator with a ring-type bullseye geometry that is unprecedented in this platform. We measured mechanical modes up to 3.4 GHz with quality factors of 4000 (at 77 K) and reached optomechanical coupling rates up to 39 kHz at telecom wavelengths. The temperature dependence of mechanical losses was assessed and demonstrate the efficiency and anisotropy resilience of the bullseye anchor loss suppression. Such characteristics are valuable for active optomechanics, coherent microwave-to-optics conversion via piezo-mechanics and other implementations of high-frequency oscillators in III-V materials.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127041082","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}
arXiv: OpticsPub Date : 2020-08-07DOI: 10.1063/5.0024432
M. Calamai, A. Ranfagni, F. Marin
{"title":"Transfer of a levitating nanoparticle between optical tweezers","authors":"M. Calamai, A. Ranfagni, F. Marin","doi":"10.1063/5.0024432","DOIUrl":"https://doi.org/10.1063/5.0024432","url":null,"abstract":"We demonstrate and characterize the transfer of a levitating silica nanosphere between two optical tweezers, at low pressure. Both optical traps are mounted on the heads of optical fibers and placed on translation stages in vacuum chambers. Our setup allows to physically separate the particle loading environment from the experimental chamber, where the second tweezer can position the particle inside a high Finesse optical cavity. The separation prevents from spoiling the cavity mirrors and the chamber cleanliness during the particle loading phase. Our system provides a very reliable and simply reproducible protocol for preparing cavity optomechanics experiments with levitating nanoparticles, opening the way to systematic studies of quantum phenomena and easing the realization of sensing devices.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"347 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114821105","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}
arXiv: OpticsPub Date : 2020-08-07DOI: 10.1364/osac.418378
Monjurul Meem, Apratim Majumder, R. Menon
{"title":"Free-form broadband flat lenses for visible imaging","authors":"Monjurul Meem, Apratim Majumder, R. Menon","doi":"10.1364/osac.418378","DOIUrl":"https://doi.org/10.1364/osac.418378","url":null,"abstract":"In the absence of separate apertures, the size and focal length of a lens determines both its resolution and light-collection ability defined by numerical-aperture (NA) and f/#, respectively. We utilize free-form broadband-diffractive-optical elements (BDOEs) to create flat lenses that decouple NA from f#, whereby the resolution of the lens may be chosen independently from its light-collection ability. Specifically, we designed, fabricated and characterized three BDOE lenses operating in the visible band (450nm-750nm), each with f/11.25, but with NAs of 0.00075, 0.0067 and 0.054, respectively. Simulations confirm that such decoupling is possible even at much higher NAs. Experiments confirm achromatic focusing and broadband imaging. One of the lenses exhibited a depth-of-focus almost 2 orders of magnitude larger than the diffraction limit. Such BDOE lenses could be very useful in focal-plane arrays with large pixel sizes, where light collection efficiency needs to be maintained. Furthermore, by abandoning rotational symmetry, one can achieve free-form geometries in the focal spot, such as a square that can more closely match the geometry of the sensor pixel.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"135 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114367992","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}
arXiv: OpticsPub Date : 2020-08-06DOI: 10.21203/rs.3.rs-59790/v1
J. M. Ratajczak
{"title":"On optical transmittance of ultra diluted gas","authors":"J. M. Ratajczak","doi":"10.21203/rs.3.rs-59790/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-59790/v1","url":null,"abstract":"\u0000 The paper proposes a model of optical transmittance of ultra diluted gas taking into account gas particles non-locality, the quantum effect of wave function spreading derived from solving the Schr ̈odinger equation for a free particle. A significant increase in the transmittance of such gas is envisaged as compared to the classical predictions. Some quantitative and qualitative consequences of the model are indicated and falsifying experiments are proposed. The classic Beer-Lambert law equation within range of its applicability is derived from the model. Remarks to some astrophysical phenomena and possible interpretations of Quantum Mechanics are made. An experiment consistent with the predictions of this model is referenced.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115271530","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}
arXiv: OpticsPub Date : 2020-08-05DOI: 10.1364/optica.404746
P. Boucher, C. Fabre, G. Labroille, N. Treps
{"title":"Spatial optical mode demultiplexing as a practical tool for optimal transverse distance estimation","authors":"P. Boucher, C. Fabre, G. Labroille, N. Treps","doi":"10.1364/optica.404746","DOIUrl":"https://doi.org/10.1364/optica.404746","url":null,"abstract":"We present the experimental implementation of simultaneous spatial multimode demultiplexing as a distance measurement tool. We first show a simple and intuitive derivation of the Fisher information in the presence of Poissonian noise. We then estimate the distance between two incoherent beams in both directions of the transverse plane, and find a perfect accordance with theoretical prediction, given a proper calibration of the demultiplexer. We find that, even though sensitivity is limited by the cross-talks between channels, we can perform measurements in 2 dimensions much beyond Rayleigh limit with a large dynamic.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"293 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124211439","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}
arXiv: OpticsPub Date : 2020-08-04DOI: 10.1615/AnnualRevHeatTransfer.2020032805
Xueji Wang, R. Starko-Bowes, C. Khandekar, Z. Jacob
{"title":"HIGH-TEMPERATURE THERMAL PHOTONICS","authors":"Xueji Wang, R. Starko-Bowes, C. Khandekar, Z. Jacob","doi":"10.1615/AnnualRevHeatTransfer.2020032805","DOIUrl":"https://doi.org/10.1615/AnnualRevHeatTransfer.2020032805","url":null,"abstract":"Controlling and detecting thermal radiation is of vital importance for varied applications ranging from energy conversion systems and nanoscale information processing devices to infrared imaging, spectroscopy and sensing. We review the field of high temperature thermal photonics which aims to control the spectrum, polarization, tunability, switchability and directionality of heat radiation from engineered materials in extreme environments. We summarize the candidate materials which are being pursued by the community that have simultaneous polaritonic/plasmonic properties as well as high temperature stability. We also provide a detailed discussion of the common photonic platforms including meta-gratings, photonic crystals, and metamaterials used for thermal emission engineering. We review broad applications including thermophotovoltaics, high temperature radiative cooling, thermal radiation sources, and noisy nanoscale thermal devices. By providing an overview of the recent achievements in this field, we hope this review can accelerate progress to overcome major outstanding problems in modern thermal engineering.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121411799","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}
arXiv: OpticsPub Date : 2020-08-04DOI: 10.1103/PHYSREVA.103.033709
R. Ikuta, Toshiki Kobayashi, T. Yamazaki, N. Imoto, Takashi Yamamoto
{"title":"Cavity-enhanced broadband photonic Rabi oscillation","authors":"R. Ikuta, Toshiki Kobayashi, T. Yamazaki, N. Imoto, Takashi Yamamoto","doi":"10.1103/PHYSREVA.103.033709","DOIUrl":"https://doi.org/10.1103/PHYSREVA.103.033709","url":null,"abstract":"A coherent coupling among different energy photons provided by nonlinear optical interaction is regarded as a photonic version of the Rabi oscillation. Cavity enhancement of the nonlinearity reduces energy requirement significantly and pushes the scalability of the frequency-encoded photonic circuit based on the photonic Rabi oscillation. However, confinement of the photons in the cavity severely limits the number of interactable frequency modes. Here we demonstrate a wide-bandwidth and efficient photonic Rabi oscillation achieving full-cycle oscillation based on a cavity-enhanced nonlinear optical interaction with a monolithic integration. We also show its versatile manipulation beyond the frequency degree of freedom such as an all-optical control for polarizing photons with geometric phase. Our results will open up full control accessible to synthetic dimensional photonic systems over wide frequency modes as well as a large-scale photonic quantum information processing.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134079384","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}
{"title":"Silicon integrated microwave photonic beamformer","authors":"Chen Zhu, Liangjun Lu, Wensheng Shan, Weihan Xu, Gangqiang Zhou, Linjie Zhou, Jianping Chen","doi":"10.1364/OPTICA.391521","DOIUrl":"https://doi.org/10.1364/OPTICA.391521","url":null,"abstract":"Optical beamforming networks (OBFNs) based on optical true time delay lines (OTTDLs) are well-known as the promising candidate to solve the bandwidth limitation of traditional electronic phased array antennas (PAAs) due to beam squinting. Here we report the first monolithic 1x8 microwave photonic beamformer based on switchable OTTDLs on the silicon-on-insulator platform. The chip consists of a modulator, an eight-channel OBFN, and 8 photodetectors, which includes hundreds of active and passive components in total. It has a wide operating bandwidth from 8 to 18 GHz, which is almost two orders larger than that of electronic PAAs. The beam can be steered to 31 distinguishable angles in the range of -75.51° to 75.64° based on the beam pattern calculation with the measured RF response. The response time for beam steering is 56 {mu}s. These results represent a significant step towards the realization of integrated microwave photonic beamformers that can satisfy compact size and low power consumption requirements for the future radar and wireless communication systems.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125283396","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}
arXiv: OpticsPub Date : 2020-07-31DOI: 10.1117/12.2546243
L. Jia, Dandan Cui, Jiayang Wu, Haifeng Feng, Yunyi Yang, Tieshan Yang, Yang Qua, Y. Duc, W. Hao, B. Jia, D. Moss
{"title":"BiOBr 2D materials for integrated nonlinear photonics devices","authors":"L. Jia, Dandan Cui, Jiayang Wu, Haifeng Feng, Yunyi Yang, Tieshan Yang, Yang Qua, Y. Duc, W. Hao, B. Jia, D. Moss","doi":"10.1117/12.2546243","DOIUrl":"https://doi.org/10.1117/12.2546243","url":null,"abstract":"As a new group of advanced 2D layered materials, bismuth oxyhalides, i.e., BiOX (X = Cl, Br, I), have recently become of great interest. In this work, we characterize the third-order optical nonlinearities of BiOBr, an important member of the BiOX family. The nonlinear absorption and Kerr nonlinearity of BiOBr nanoflakes at both 800 nm and 1550 nm are characterized via the Z-Scan technique. Experimental results show that BiOBr nanoflakes exhibit a large nonlinear absorption coefficient = b{eta} = 10-7 m/W as well as a large Kerr coefficient n2 = 10-14 m2/W. We also note that the n2 of BiOBr reverses sign from negative to positive as the wavelength is changed from 800 nm to 1550 nm. We further characterize the thickness-dependent nonlinear optical properties of BiOBr nanoflakes, finding that the magnitudes of b{eta} and n2 increase with decreasing thickness of the BiOBr nanoflakes. Finally, we integrate BiOBr nanoflakes into silicon integrated waveguides and measure their insertion loss, with the extracted waveguide propagation loss showing good agreement with mode simulations based on ellipsometry measurements. These results confirm the strong potential of BiOBr as a promising nonlinear optical material for high-performance hybrid integrated photonic devices.","PeriodicalId":304443,"journal":{"name":"arXiv: Optics","volume":"17 17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125617419","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}
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