Hakutulokset - diffraction grating

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Registration of non-stationary processes, namely snapshot hyperspectral imaging that allows to capture data cube I(x,y,λ) in one measurement act, is of interest for imaging spectroscopy.The purpose of the work is increasing of spectral resolution of imaging spectrometers with spatial filtering of ob...

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Planar waveguide structure has benefits to expand the exit pupil of the near-eye display. To achieve a uniform output luminance within the expanded exit pupil, a specific distribution of diffractive efficiency (DE) should be set for the out-coupling grating. In this paper, a physical model is built...

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This paper reports far-field of the electro-optical diffraction grating to the advantage of electro-optic response of 5CB liquid crystal. The diffraction grating was produced by intersacting of two laser beam of laser HeNe 632.8nm wavelength radiation transmitted through a 5CB liquid crystal dopped...

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This paper describes a new method for fabrication of tailorable elastomeric gratings with tunable groove density gradients based on stretching of the grating sample in a direction perpendicular to the grating line within the grating surface. The advantage of this method is that the tunable groove de...

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Volume holographic gratings (VHGs) act as an in-coupler or out-coupler could be applied in holographic waveguide display system in which high diffraction efficiency is one of the key factors. Here, VHGs coupled with Ag thin film to enhance its diffraction efficiency is demonstrated. The first-order...

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The diffraction of a scalar wave field incident on a flat irregular diffraction grating with arbitrarily oriented rectangular apertures is considered. It is shown that if the random grating is illuminated from the far zone (the diffraction problem in the Fraunhofer formulation), then the diffraction...

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A simple and robust testing system based on a laser self-mixing grating interferometer (SMGI) is proposed to determine the sensitivity of accelerometers. Self-mixing grating interference occurs when the light emitted from a laser diode is incident onto a reflective grating at a fixed angle and the f...

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In this paper, a high-precision digital rotary encoder based on dot-matrix gratings (DMGs) is proposed for detecting shaft rotation. The DMG-based encoder is composed of a laser diode, a beam-shaping lens, a code disc, and a detector. In principle, a shaped rectangular beam illuminates a stripe of D...

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The transformation of nanophotonic sensors from laboratory-based demonstrations to a portable system to ensure widespread applicability in everyday life requires their integration with detectors for direct electrical read out. As complementary metal oxide semiconductor (CMOS) technology has revoluti...

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Volumetric imaging of focusing waveguide grating coupler emission with high spatial resolution in the visible ( <inline-formula><tex-math notation="LaTeX">${{\lambda \,= \,637.3\,\text{nm}}}$</tex-math></inline-formula>) is demonstrated using a scanning near-field o...

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The total and individual multipole moments of  magnetic electron scattering form factors in 41Ca  have been investigated using a widely successful model which is the nuclear shell model configurations keeping in mind of 1f7/2 subshell as an L-S shell and Millinar, Baymann, Zamick as L-S shell (F7MB...

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Conventional Dammann grating is a binary-phase (0, &#x03C0;) transmission grating capable of splitting an incoming laser beam into multiple outgoing beams with equal intensity. In this paper, we present an alternative design for Dammann-type beamsplitter with a non &#x03C0;-phase shift value...

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A simulation based on the rate equations was performed to analyze the concentration distribution of molecules in phenanthrenequinone (PQ) doped polymethyl methacrylate (PMMA) polymers (PQ-PMMAs) exposed using a two-beam interference configuration. The concentration distributions were used to predict...

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Spectrometers play a crucial role in photonic applications, but their design involves trade-offs related to miniaturization, spectral fidelity, and their measurement dynamic range. We demonstrated a high-resolution, low-stray-light spectrometer with a compact size comprising two symmetric multiple-d...

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In this paper, we propose and validate a new approach for increasing the optical bandwidth of waveguide grating couplers by using a center-symmetric grating structure. Our results demonstrate state-of-the-art performance in increasing the 1 dB optical bandwidth to 108 nm and experimentally validated...

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Silicon photonic optical phased arrays are promising solutions for solid-state LIDAR. But the nonlinear absorption significantly saturates the optical power in the waveguides at 1.5-&#x03BC;m wavelengths. Besides, the high refractive index contrast of silicon grating exhibits a strong diffractio...

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We present a method to efficiently separate the rectangularly symmetric modes of light with two phase-only holograms. The holograms, known as fan-out elements, can split the input modes into multiple copies. A subsequent lens focuses these modes to different lateral positions. We use two spatial lig...

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In this work we extend the optimum phase triplicator diffraction grating profile to a phase-only hologram. This modified hologram generates three equally-energetic orders with the highest diffraction efficiency, yielding a direct version and an inverted complex conjugate version of the target patter...

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A new design of radially polarized surface-emitting laser (RPSEL) is presented for the first time. RPSEL which has a second-order grating shallowly etched on top of a microcylinder cavity is easy to fabricate. The grating selects a specific whispering-gallery mode with the proper emission pattern (r...

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