Geometrical optics ≈ Geometrical optics
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Freeform optics for imaging Open
In the last 10 years, freeform optics has enabled compact and high-performance imaging systems. This article begins with a brief history of freeform optics, focusing on imaging systems, including marketplace emergence. The development of t…
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Meta-Optics with Mie Resonances Open
Optical magnetic responses and subwavelength localization of light, driven by Mie resonances in high-index nanoparticles, could spur new, breakthrough applications for nanoantennas, nanolasers, highly efficient metasurfaces and ultrafast m…
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Artificial Intelligence in Meta-optics Open
Recent years have witnessed promising artificial intelligence (AI) applications in many disciplines, including optics, engineering, medicine, economics, and education. In particular, the synergy of AI and meta-optics has greatly benefited …
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All-dielectric planar chiral metasurface with gradient geometric phase Open
Planar optical chirality of a metasurface measures its differential response between left and right circularly polarized (CP) lights and governs the asymmetric transmission of CP lights. In 2D ultra-thin plasmonic structures the circular d…
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Geometric Phase in Optics: From Wavefront Manipulation to Waveguiding Open
Geometric phase is a unifying and central concept in physics, including optics. As a matter of fact, optics played a pivotal role from the inception of this new paradigm, as some of the first experimental demonstrations have been carried o…
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Metasurface Freeform Nanophotonics Open
Freeform optics aims to expand the toolkit of optical elements by allowing for more complex phase geometries beyond rotational symmetry. Complex, asymmetric curvatures are employed to enhance the performance of optical components while min…
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Computational toolbox for optical tweezers in geometrical optics Open
Optical tweezers have found widespread application in many fields, from\nphysics to biology. Here, we explain in detail how optical forces and torques\ncan be described within the geometrical optics approximation and we show that\nthis app…
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Inverse Designed Metalenses with Extended Depth of Focus Open
Extended depth of focus (EDOF) lenses are important for various applications in computational imaging and microscopy. In addition to enabling novel functionalities, EDOF lenses can alleviate the need for stringent alignment requirements fo…
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Classical and generalized geometric phase in electromagnetic metasurfaces Open
The geometric phase concept has profound implications in many branches of physics, from condensed matter physics to quantum systems. Although geometric phase has a long research history, novel theories, devices, and applications are consta…
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Computational inverse design for cascaded systems of metasurface optics Open
Metasurfaces are an emerging technology that may supplant many of the conventional optics found in imaging devices, displays, and precision scientific instruments. Here, we develop a method for designing optical systems composed of multipl…
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Light propagation beyond the mean-field theory of standard optics Open
With ready access to massive computer clusters we may now study light propagation in a dense cold atomic gas by means of basically exact numerical simulations. We report on a direct comparison between traditional optics, that is, electrody…
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Active flat optics using a guided mode resonance Open
Dynamically-controlled flat optics relies on achieving active and effective control over light-matter interaction in ultrathin layers. A variety of metasurface designs have achieved efficient amplitude and phase modulation. Particularly, n…
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Light Meets Water in Nonlocal Media: Surface Tension Analogue in Optics Open
Shallow water wave phenomena find their analogue in optics through a nonlocal nonlinear Schrödinger (NLS) model in 2+1 dimensions. We identify an analogue of surface tension in optics, namely, a single parameter depending on the degree of …
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Scattering by Curvatures, Radiationless Sources, Transmission Eigenfunctions, and Inverse Scattering Problems Open
We consider several intriguingly connected topics in the theory of wave propagation: geometrical characterizations of radiationless sources, nonradiating incident waves, interior transmission eigenfunctions, and their applications to inver…
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Diffraction of electromagnetic waves in the gravitational field of the Sun Open
We consider the propagation of electromagnetic (EM) waves in the\ngravitational field of the Sun within the first post-Newtonian approximation of\nthe general theory of relativity. We solve Maxwell's equations for the EM field\npropagating…
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Rendering specular microgeometry with wave optics Open
Simulation of light reflection from specular surfaces is a core problem of computer graphics. Existing solutions either make the approximation of providing only a large-area average solution in terms of a fixed BRDF (ignoring spatial detai…
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Physical-geometric optics method for large size faceted particles Open
A new physical-geometric optics method is developed to compute the single-scattering properties of faceted particles. It incorporates a general absorption vector to accurately account for inhomogeneous wave effects, and subsequently yields…
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Identifying pre-service physics teachers’ misconceptions and conceptual difficulties about geometrical optics Open
This study investigated pre-service physics teachers' (PSPTs) misconceptions and conceptual difficulties about geometrical optics in the contexts of plane mirrors (single and hinged), spherical mirrors (concave and convex) and lenses (conv…
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A computational-observer model of spatial contrast sensitivity: Effects of wave-front-based optics, cone-mosaic structure, and inference engine Open
We present a computational-observer model of the human spatial contrast-sensitivity function based on the Image Systems Engineering Toolbox for Biology (ISETBio) simulation framework. We demonstrate that ISETBio-derived contrast-sensitivit…
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Unsupervised Learning of Depth, Optical Flow and Pose With Occlusion From 3D Geometry Open
In autonomous driving, monocular sequences contain lots of information.\nMonocular depth estimation, camera ego-motion estimation and optical flow\nestimation in consecutive frames are high-profile concerns recently. By\nanalyzing tasks ab…
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Singularities in Physics and Engineering Open
Singularities are pervasive throughout nature and this book is one of the first to combine all aspects of singular optics and to give a detailed view of the subject. Singularities in Optical Physics and Engineering give a thorough introduc…
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Modeling physical optics phenomena by complex ray tracing Open
Physical optics modeling requires propagating optical wave fields from a specific radiometric source through complex systems of apertures and reflective or refractive optical components, or even complete instruments or devices, usually to …
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Aberration correction for direct laser written waveguides in a transverse geometry Open
The depth dependent spherical aberration is investigated for ultrafast laser written waveguides fabricated in a transverse writing geometry using the slit beam shaping technique in the low pulse repetition rate regime. The axial elongation…
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Inverse designed extended depth of focus meta-optics for broadband imaging in the visible Open
We report an inverse-designed, high numerical aperture (∼0.44), extended depth of focus (EDOF) meta-optic, which exhibits a lens-like point spread function (PSF). The EDOF meta-optic maintains a focusing efficiency comparable to that of a …
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Multislice does it all—calculating the performance of nanofocusing X-ray optics Open
We describe an approach to calculating the optical performance of a wide range of nanofocusing X-ray optics using multislice scalar wave propagation with a complex X-ray refractive index. This approach produces results indistinguishable fr…
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Experimental validation of the vectorial complex ray model on the inter-caustics scattering of oblate droplets Open
We report the first experimental validation of the Vectorial Complex Ray Model (VCRM) using the scattering patterns of large oblate droplets trapped in an acoustic field. The two principal radii and refractive index of the droplets are ret…
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Comparison of microfacet BRDF model to modified Beckmann-Kirchhoff BRDF model for rough and smooth surfaces Open
A popular class of BRDF models is the microfacet models, where geometric optics is assumed. In contrast, more complex physical optics models may more accurately predict the BRDF, but the calculation is more resource intensive. These seemin…
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Fully controllable adiabatic geometric phase in nonlinear optics Open
We propose and analyze a new way for obtaining an adiabatic geometric phase for light, via the sum-frequency-generation nonlinear process. The state of light is represented by the complex amplitudes at two different optical frequencies, co…
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Linear assignment problem in the design of freeform refractive optical elements generating prescribed irradiance distributions Open
We consider the problem of calculating the eikonal function defined on a certain curved surface from the condition of generating a prescribed irradiance distribution on a target surface. We show that the calculation of the "ray mapping" co…
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Investigating the Refractive Index Sensitivity of U-Bent Fiber Optic Sensors Using Ray Optics Open
Geometrically modified fiber optic sensors (FOS), particularly U-bent FOS, have gained significant attention due to their remarkably high refractive index (RI) and evanescent wave absorbance (EWA) sensitivity, as well as their ergonomic de…