scholarly journals 3D-Integrated metasurfaces for full-colour holography

2019 ◽  
Vol 8 (1) ◽  
Author(s):  
Yueqiang Hu ◽  
Xuhao Luo ◽  
Yiqin Chen ◽  
Qing Liu ◽  
Xin Li ◽  
...  
Keyword(s):  
Information Processing ◽  
High Efficiency ◽  
Optical Systems ◽  
Data Recording ◽  
3D Integration ◽  
Optical Elements ◽  
Multiple Functions ◽  
Fabry Perot ◽  
Integration Concept ◽  
Dual Functions

Abstract Metasurfaces enable the design of optical elements by engineering the wavefront of light at the subwavelength scale. Due to their ultrathin and compact characteristics, metasurfaces possess great potential to integrate multiple functions in optoelectronic systems for optical device miniaturisation. However, current research based on multiplexing in the 2D plane has not fully utilised the capabilities of metasurfaces for multi-tasking applications. Here, we demonstrate a 3D-integrated metasurface device by stacking a hologram metasurface on a monolithic Fabry–Pérot cavity-based colour filter microarray to simultaneously achieve low-crosstalk, polarisation-independent, high-efficiency, full-colour holography, and microprint. The dual functions of the device outline a novel scheme for data recording, security encryption, colour displays, and information processing. Our 3D integration concept can be extended to achieve multi-tasking flat optical systems by including a variety of functional metasurface layers, such as polarizers, metalenses, and others.

scholarly journals A review of dielectric optical metasurfaces for wavefront control

Nanophotonics ◽  
2018 ◽  
Vol 7 (6) ◽  
pp. 1041-1068 ◽  
Author(s):  
Seyedeh Mahsa Kamali ◽  
Ehsan Arbabi ◽  
Amir Arbabi ◽  
Andrei Faraon
Keyword(s):  
High Efficiency ◽  
Chromatic Dispersion ◽  
Phase Control ◽  
Diffractive Optics ◽  
Optical Systems ◽  
Optical Elements ◽  
Wavefront Control ◽  
The Past ◽  
Recent Developments ◽  
Dielectric Structures

AbstractDuring the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here, we review some of these recent developments, with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then, we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome.

scholarly journals Ultrawide-angle and high-efficiency metalens in hexagonal arrangement

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Chun-Yuan Fan ◽  
Chia-Ping Lin ◽  
Guo-Dung J. Su
Keyword(s):  
High Efficiency ◽  
Numerical Aperture ◽  
Vital Role ◽  
Optical Systems ◽  
Wide Field ◽  
Wide Angle ◽  
Camera Systems ◽  
Single Lens ◽  
Hexagonal Arrangement ◽  
Virtual And Augmented Reality

Abstract Wide-angle optical systems play a vital role in imaging applications and have been researched for many years. In traditional lenses, attaining a wide field of view (FOV) by using a single optical component is difficult because these lenses have crucial aberrations. In this study, we developed a wide-angle metalens with a numerical aperture of 0.25 that provided a diffraction-limited FOV of over 170° for a wavelength of 532 nm without the need for image stitching or multiple lenses. The designed wide-angle metalens is free of aberration and polarization, and its full width of half maximum is close to the diffraction limit at all angles. Moreover, the metalens which is designed through a hexagonal arrangement exhibits higher focusing efficiency at all angles than most-seen square arrangement. The focusing efficiencies are as high as 82% at a normal incident and 45% at an incident of 85°. Compared with traditional optical components, the proposed metalens exhibits higher FOV and provides a more satisfactory image quality because of aberration correction. Because of the advantages of the proposed metalens, which are difficult to achieve for a traditional single lens, it has the potential to be applied in camera systems and virtual and augmented reality.

The Research of Word Similarity in Semantic Retrieval

2014 ◽  
Vol 701-702 ◽  
pp. 413-417
Author(s):  
Jie Ran ◽  
Ji Ya Huang ◽  
Zu Xiao
Keyword(s):  
Information Processing ◽  
High Efficiency ◽  
Processing Technology ◽  
Semantic Retrieval ◽  
Word Similarity ◽  
Crucial Question ◽  
Computing Method

Word similarity computing is a crucial question in information processing technology. In this paper, an integrated word similarity computing method is proposed by analyzed morpheme's similarity, word order's similarity and word length's similarity, and parameters of the method are decided by experiments. The experiments show that this method has high efficiency.

scholarly journals Amplitude electro-optical modulation of radiation by sequences of Fabry-Perot resonators

2020 ◽  
Vol 56 (2) ◽  
pp. 217-223
Author(s):  
V. B. Zalesski ◽  
A. I. Konoiko ◽  
V. M. Kravchenko ◽  
H. S. Kuzmitskaya
Keyword(s):  
Lithium Niobate ◽  
High Efficiency ◽  
Optical Modulation ◽  
Operating Point ◽  
Optical Modulator ◽  
Control Voltage ◽  
Clock Frequency ◽  
Fabry Perot ◽  
In Series ◽  
Light Signals

In this paper, we considered the method of amplitude electro-optical modulation of radiation using sequences of Fabry-Perot resonators based on the transverse electro-optical effect on the example of lithium niobate LiNbO3. With this method, it is possible to significantly reduce the voltage of the control electromagnetic field of the electro-optical amplitude modulator operating in the transmission mode of the light beam while maintaining its high efficiency. The reduction of the control voltage is achieved by increasing the number of Fabry-Perot resonators installed in series and the phase shift relative to the extremum of the transmittance function. This method allows to diminish the duration of the received light signals which leads to an increase in the clock frequency while maintaining a high efficiency of the radiation modulation. Diminishing the duration of light signals is achieved by using separate modulation channels of two sequences of electro-optical Fabry-Perot resonators, the first of which works on the transmission and the second one on the reflection. Increasing the clock frequency at the output of the modulator is achieved by summing the signals coming from several modulation channels. It is shown that the value of the control voltage for an amplitude electro-optical modulator based on a sequence of Fabry-Perot resonators made of lithium niobate LiNbO3, with an operating wavelength of 1.307 microns, can be 4 V in the case when its initial operating point corresponds to the maximum transmittance. The control voltage is 2 V if the initial operating point is shifted in phase relative to the extremum of the transmittance function.

High Efficiency Single Wafer Cleaning for Wafer Bonding-Based 3D Integration Applications

2012 ◽  
Vol 187 ◽  
pp. 269-272 ◽  
Author(s):  
Don Dussault ◽  
F. Fournel ◽  
V. Dragoi
Keyword(s):  
Removal Efficiency ◽  
Wafer Bonding ◽  
High Efficiency ◽  
Current Work ◽  
Particle Removal ◽  
3D Integration ◽  
Production Scale ◽  
Megasonic Cleaning ◽  
Wafer Cleaning ◽  
Transducer Design

Current work describes development, testing and verification of a single wafer megasonic cleaning method utilizing a transducer design that meets the extreme particle neutrality, Particle Removal Efficiency (PRE), and repeatability requirements of production scale wafer bonding and other applications requiring extremely low particle levels.

scholarly journals Bi-phase emulsion droplets as dynamic fluid optical systems

2019 ◽  
Vol 215 ◽  
pp. 13003
Author(s):  
Sara Nagelberg ◽  
Amy Goodling ◽  
Kaushikaram Subramanian ◽  
George Barbastathis ◽  
Moritz Kreysing ◽  
...  
Keyword(s):  
Critical Role ◽  
Optical Systems ◽  
Emulsion Droplet ◽  
Optical Elements ◽  
Optical Components ◽  
Micro Scale ◽  
Emulsion Droplets ◽  
Spectral Separation ◽  
Optical Behavior ◽  
Scatter Light

Micro-scale optical components play a critical role in many applications, in particular when these components are capable of dynamically responding to different stimuli with a controlled variation of their optical behavior. Here, we discuss the potential of micro-scale bi-phase emulsion droplets as a material platform for dynamic fluid optical components. Such droplets act as liquid compound micro-lenses with dynamically tunable focal lengths. They can be reconfigured to focus or scatter light and form images. In addition, we discuss how these droplets can be used to create iridescent structural color with large angular spectral separation. Experimental demonstrations of the emulsion droplet optics are complemented by theoretical analysis and wave-optical modelling. Finally, we provide evidence of the droplets utility as fluidic optical elements in potential application scenarios.

Optical Systems for Spectroscopic Telescopes

1969 ◽  
Vol 1 (6) ◽  
pp. 291-293 ◽  
Author(s):  
T. Dunham
Keyword(s):  
Polar Axis ◽  
Optical Systems ◽  
Fourier Spectroscopy ◽  
Low Resolution ◽  
Primary Mirror ◽  
Fabry Perot ◽  
Light Efficiency ◽  
The Ideal

Astronomical spectrographs are usually mounted at one of three focal positions on a reflecting telescope: (1) the Newtonian focus, at the top of the telescope tube, with only one reflection from the primary mirror, where the spectrograph must be small and light, and designed for low resolution on faint objects; (2) the Cassegrain focus, behind the cell of the primary mirror, with a total of two reflections, where the spectrograph can be appreciably larger, to give intermediate resolution; and (3) the coude focus, at a fixed location below the end of the polar axis, with three, four or five reflections, where there is no limit to the size of the instrument, and where resolution is limited only by the brightness of the object and the light efficiency of the system. This is the ideal location for image tubes, Fabry-Perot interferometers, and equipment for Fourier spectroscopy.

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