Results 51 to 60 of about 7,097 (301)
Physical Review X, 2017 The angular response of thin diffractive optical elements is highly correlated. For example, the angles of incidence and diffraction of a grating are locked through the grating momentum determined by the grating period.
Seyedeh Mahsa Kamali +5 more
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Misalignment resilient diffractive optical networks [PDF]
Nanophotonics, 2018 Abstract As an optical machine learning framework, Diffractive Deep Neural Networks (D 2 NN) take advantage of data‐driven training methods used in deep learning to devise light–matter interaction in 3D for performing a desired statistical inference task. Multi‐layer optical
Deniz Mengu +5 more
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Advanced Engineering Materials, EarlyView.Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios +5 more
wiley +1 more source
Large area optimization of meta-lens via data-free machine learning
Communications Engineering, 2023 Sub-wavelength diffractive optics, commonly known as meta-optics, present a complex numerical simulation challenge, due to their multi-scale nature. The behavior of constituent sub-wavelength scatterers, or meta-atoms, needs to be modeled by full-wave ...
Maksym Zhelyeznyakov +6 more
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Issues in Optical Diffraction Theory [PDF]
Journal of Research of the National Institute of Standards and Technology, 2009 This paper focuses on unresolved or poorly documented issues pertaining to Fresnel's scalar diffraction theory and its modifications. In Sec. 2 it is pointed out that all thermal sources used in practice are finite in size and errors can result from insufficient coherence of the optical field. A quarter-wave criterion is applied to show how such errors
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Advanced Engineering Materials, EarlyView.A hierarchical porous copper current collector is fabricated via three‐dimensional printing combined with pressureless sintering to stabilize lithium metal anodes. The interconnected architecture lowers local current density, guides uniform Li deposition within pores, and suppresses dendrite growth.
Alok Kumar Mishra, Mukul Shukla
wiley +1 more source
Field Guide to Diffractive Optics
, 2011 This SPIE Field Guide provides the operational principles and established terminology of diffractive optics as well as a comprehensive overview of the main types of diffractive optics components.
Soskind, Yakov, Yakov G. Soskind
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International Journal of Optics, 2010 A novel study has been undertaken for the coupling efficiency enhancement on planar (refractive and diffractive) microlenses as coupling elements with various geometrical shapes in fibre optics communication. When the dispersion of the planar diffractive
S. Selvanandan, P. M. Anbarasan
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Quasi-optical diffraction tomography
MMET Conference Proceedings. 1998 International Conference on Mathematical Methods in Electromagnetic Theory. MMET 98 (Cat. No.98EX114), 2002 Tomographical methods of image reconstruction of two-dimensional cross-sections of volumetric objects in the millimeter wavelength band are suggested and considered. Experimental images obtained using antennas of dielectric type and radiation frequency f/spl ap/136 GHz are represented.
Vertiy, AA +3 more
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Advanced Engineering Materials, EarlyView.Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth +6 more
wiley +1 more source