Nanobeam extraction with periodic optical grating staircase structure

2018 ◽  
Vol 60 (9) ◽  
pp. 2148-2153 ◽  
Author(s):  
Vishal Sorathiya ◽  
Shobhit Kumar Patel ◽  
Yogeshwar Kosta ◽  
Hardik Dhamecha
Keyword(s):  
Optical Grating ◽  
Staircase Structure

scholarly journals Analysis of Dielectric Waveguide Grating and Fabry–Perot Modes in Elastic Grating in Optical Detection of Ultrasound

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4081
Author(s):  
Suejit Pechprasarn ◽  
Chayanisa Sukkasem ◽  
Phitsini Suvarnaphaet
Keyword(s):  
Optical Properties ◽  
Dielectric Waveguide ◽  
Figure Of Merit ◽  
Pressure Range ◽  
Optical Filter ◽  
Grating Period ◽  
Wave Mode ◽  
Waveguide Grating ◽  
Fabry Perot ◽  
Optical Grating

In our previous work, we have demonstrated that dielectric elastic grating can support Fabry–Perot modes and provide embedded optical interferometry to measure ultrasonic pressure. The Fabry–Perot modes inside the grating provide an enhancement in sensitivity and figure of merit compared to thin film-based Fabry–Perot structures. Here, in this paper, we propose a theoretical framework to explain that the elastic grating also supports dielectric waveguide grating mode, in which optical grating parameters control the excitation of the two modes. The optical properties of the two modes, including coupling conditions and loss mechanisms, are discussed. The proposed grating has the grating period in micron scale, which is shorter than the wavelength of the incident ultrasound leading to an ultrasonic scattering. The gap regions in the grating allow the elastic grating thickness to be compressed by the incident ultrasound and coupled to a surface acoustic wave mode. The thickness compression can be measured using an embedded interferometer through one of the optical guided modes. The dielectric waveguide grating is a narrow bandpass optical filter enabling an ultrasensitive mode to sense changes in optical displacement. This enhancement in mechanical and optical properties gives rise to a broader detectable pressure range and figure of merit in ultrasonic detection; the detectable pressure range and figure of merit can be enhanced by 2.7 times and 23 times, respectively, compared to conventional Fabry–Perot structures.

Width Walk Control in 3D NAND Staircase Structure Etching

2021 ◽  
Author(s):  
Ching-Hung Hsiao ◽  
Chen-Yu Cheng ◽  
Hong-Ji Lee ◽  
Nan-Tzu Lian ◽  
Tzung-Ting Han ◽  
...  
Keyword(s):  
Staircase Structure

Modal Testing and FE Model Updating of a Lively Staircase Structure

2012 ◽  
pp. 547-557 ◽  
Author(s):  
Ali Vasallo Belver ◽  
Stana Zivanovic ◽  
HiepVu Dang ◽  
Melania Istrate ◽  
Antolin Lorenzana Iban
Keyword(s):  
Model Updating ◽  
Modal Testing ◽  
Fe Model ◽  
Staircase Structure ◽  
Fe Model Updating

The Principle and Structure of Novel High-Precision Linear Time Grating Displacement Sensors

2012 ◽  
Vol 236-237 ◽  
pp. 1216-1221
Author(s):  
Dong Lin Peng ◽  
Ji Sen Yang ◽  
Xi Hou Chen ◽  
Zi Ran Chen
Keyword(s):  
Linear Time ◽  
Theoretical Concept ◽  
Electrical Machine ◽  
Displacement Sensors ◽  
Time Space ◽  
Optical Grating ◽  
Testing Technology ◽  
Measurement And Testing ◽  
Space Coordinate ◽  
Physical And Mathematical Models

The existing grating type sensors such as optical grating sensor, have long been designed to rely on the precise mechanical space division technology, which is hard to develop without heavy investment. A theoretical concept, time-space coordinate transformation, was presented to realize measuring spatial displacement with time difference. Similar to the principle of circular time grating based on rotating electrical machine, linear time grating is designed based on the principle of linear motor, with which the physical and mathematical models of linear time grating are established. Based on these models linear time grating mechanical structure is designed, which has commercialization value. The resolution of linear time grating can achieve 0.1μm tested by National Institute of Measurement and Testing Technology.

Picosecond Optical Grating Calorimetry of Singlet Methylene in Benzene

1995 ◽  
Vol 117 (24) ◽  
pp. 6635-6636 ◽  
Author(s):  
M. I. Khan ◽  
Joshua L. Goodman
Keyword(s):  
Optical Grating ◽  
Singlet Methylene

Resolution of the inverse problem of optical grating testing by means of a neural network

2004 ◽  
Author(s):  
Stephane Robert ◽  
Alain Mure-Ravaud
Keyword(s):  
Neural Network ◽  
Inverse Problem ◽  
Optical Grating

scholarly journals Tunable two-dimensional polarization grating using a self-organized micropixelated liquid crystal structure

RSC Advances ◽  
2018 ◽  
Vol 8 (72) ◽  
pp. 41472-41479 ◽  
Author(s):  
Reo Amano ◽  
Péter Salamon ◽  
Shunsuke Yokokawa ◽  
Fumiaki Kobayashi ◽  
Yuji Sasaki ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Topological Defects ◽  
Self Organization ◽  
Two Dimensional ◽  
Self Organized ◽  
Optical Grating ◽  
Liquid Crystal Structure ◽  
Polarization Grating

A micro-pixelated pattern of a nematic liquid crystal formed by self-organization of topological defects is shown to work as a tunable two-dimensional optical grating.

RESONANCES IN THE SMITH–PURCELL EFFECT

1964 ◽  
Vol 42 (6) ◽  
pp. 1195-1211 ◽  
Author(s):  
A. Hessel
Keyword(s):  
Millimeter Waves ◽  
Current Sheath ◽  
Rigorous Solution ◽  
Resonance Effects ◽  
Optical Reflection ◽  
Electromagnetic Resonance ◽  
Optical Grating ◽  
Surface Reactance ◽  
Grating Spectroscopy ◽  
Reflection Grating

A rigorous solution is derived for the problem of radiation of the Smith–Purcell type (Smith and Purcell 1953) extracted from a radio-frequency bunched electric-current sheath, above a plane exhibiting a periodically varying surface reactance. The plane is regarded as a model of an optical reflection grating. The solution indicates that the presence of the grating will give rise to electromagnetic resonance effects which are closely related to the so-called Wood anomalies (Wood 1935; Twersky 1956; Hessel 1960; Hessel and Oliner 1962; Stewart and Gallaway 1962), encountered in optical-grating spectroscopy. Utilization of these resonances may be advantageous in the generation of millimeter waves.

scholarly journals Frequency locking in an injection-locked frequency divider equation

2008 ◽  
Vol 465 (2101) ◽  
pp. 283-306 ◽  
Author(s):  
Michele V Bartuccelli ◽  
Jonathan H.B Deane ◽  
Guido Gentile
Keyword(s):  
Output Signal ◽  
Numerical Results ◽  
Frequency Divider ◽  
Driving Frequency ◽  
Devil's Staircase ◽  
Frequency Locking ◽  
Devil’S Staircase ◽  
Explicit Formulae ◽  
Staircase Structure ◽  
Driving Signal

We consider a model for a resonant injection-locked frequency divider, and study analytically the locking onto rational multiples of the driving frequency. We provide explicit formulae for the width of the plateaux appearing in the devil's staircase structure of the lockings, and in particular show that the largest plateaux correspond to even integer values for the ratio of the frequency of the driving signal to the frequency of the output signal. Our results prove the experimental and numerical results available in the literature.

The Membrane Thickness Prediction of Solder Paste Process by Phase-Shifting Projection

2013 ◽  
Vol 284-287 ◽  
pp. 550-556 ◽  
Author(s):  
Yu Fang Chung ◽  
Kun Lin Tsai ◽  
Tzer Long Chen ◽  
Yen Chu Hsu ◽  
Yi Hsuan Yu
Keyword(s):  
Projection Method ◽  
Phase Shifting ◽  
Fringe Projection ◽  
Membrane Thickness ◽  
Solder Paste ◽  
3D Image ◽  
Electronic Products ◽  
Optical Grating ◽  
Surface Image ◽  
Thickness Prediction

Electronic products have become lighter and thinner nowadays. SMT includes three basic steps, namely solder paste print, electronic component adhesion and reflow[1]. This research tends to capture the image of fringe projection based on CCD with optical grating and reconstruct the 3D surface image of solder paste use triangulation measurement. The main ideal is using fringe projection method to observe the distortion of the fringe phenomenon caused by different heights of the surface. Last, the depth of the surface is computed under test variation and the 3D image is reconstructed.

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