scholarly journals Reciprocating propagation of laser pulse intensity in free space

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Zhaoyang Li ◽  
Yanjun Gu ◽  
Junji Kawanaka
Keyword(s):  
Free Space ◽  
Light Propagation ◽  
Radiation Force ◽  
Longitudinal Axis ◽  
Straight Line ◽  
Longitudinal Effects ◽  
Potential Applications ◽  
Laser Pulse Intensity ◽  
Control Light ◽  
Backward Propagation

AbstractConstant-speed straight-line propagation in free space is a basic characteristic of light, and spatiotemporal couplings recently were used to control light propagation. In the method of flying focus, where temporal chirp and longitudinal chromatism were combined, tunable-velocities and even backward-propagation were demonstrated. We studied the transverse and longitudinal effects of the flying focus in space-time and found in a specific physics interval existing an unusual reciprocating propagation that was quite different from the previous result. By increasing the Rayleigh length in space and the temporal chirp in time, the created flying focus can propagate along a longitudinal axis firstly forward, secondly backward, and lastly forward again, and the longitudinal spatial resolution improves with increasing the temporal chirp. When this light is applied in a radiation pressure simulation, a reciprocating radiation-force can be produced accordingly. This finding extends the control of light and might enable important potential applications.

scholarly journals Reciprocating propagation of laser pulse intensity in free space

2021 ◽  
Author(s):  
Zhaoyang Li ◽  
Yanjun Gu ◽  
Junji Kawanaka
Keyword(s):  
Free Space ◽  
Light Propagation ◽  
Coherent Control ◽  
Radiation Force ◽  
Longitudinal Axis ◽  
Longitudinal Effects ◽  
Pressure Experiment ◽  
Potential Applications ◽  
Control Light ◽  
Backward Propagation

Abstract The constant-speed straight-line propagation in free space is a basic characteristic of light. Recently, several novel spatiotemporal coupling methods, for example, flying focus (or named sliding focus), are developed to control light propagation including velocity and direction. In the method of flying focus, where temporal chirp and longitudinal chromatism are combined to increase the degree of freedom for coherent control, tunable-velocities and even backward-propagation have been demonstrated. Herein, we studied the transverse and longitudinal effects of the flying focus in space and time, respectively, and found in a specific physics interval existing an unusual reciprocating propagation that was quite different from the previous result. By significantly increasing the Rayleigh length in space and the temporal chirp in time, the newly created flying focus can propagate along a longitudinal axis firstly forward, secondly backward, and lastly forward again, and the longitudinal spatial resolution for a clear reciprocation flying focus improves with increasing the temporal chirp. When this new type of light is applied in the radiation pressure experiment, a reciprocating radiation-force can be produced in space-time accordingly. This finding further extends the control of light and might enable important potential applications.

scholarly journals Tunable Channel Drop Filter in a Two-Dimensional Photonic Crystal Modulated by a Nematic Liquid Crystal

2006 ◽  
Vol 2006 ◽  
pp. 1-6 ◽  
Author(s):  
Chen-Yang Liu ◽  
Lien-Wen Chen
Keyword(s):  
Liquid Crystals ◽  
Integrated Circuits ◽  
Wavelength Division Multiplexing ◽  
Light Propagation ◽  
Nematic Liquid Crystals ◽  
Fdtd Method ◽  
Wavelength Division ◽  
Resonance Frequencies ◽  
Potential Applications ◽  
Control Light

Photonic crystals (PCs) have many potential applications because of their ability to control light-wave propagation and because PC-based waveguides may be integrated into optical circuits. We propose a novel tunable PC channel drop filter based on nematic liquid crystals and investigate its properties numerically by using the finite-difference time-domain (FDTD) method. The refractive indices of liquid crystals can be actively modulated after infiltrating nematic liquid crystals into the microcavity in PC waveguides with square lattices. Then we can control light propagation in a PC waveguide. We analyze theQ-factors and resonance frequencies of a tunable PC channel drop filter by considering various indices modulation of liquid crystals. The novel component can be used as wavelength division multiplexing in photonic integrated circuits.

Light propagation: beams and guides

Optics f2f ◽  
2018 ◽  
pp. 177-194
Author(s):  
Charles S. Adams ◽  
Ifan G. Hughes
Keyword(s):  
Free Space ◽  
Light Propagation ◽  
Laser Beams ◽  
Optical Fibres

This chapter considers the propagation of laser beams in free space and laser cavities, and light propagating in waveguides such as optical fibres.

scholarly journals Nonparaxial Propagation Properties of Specially Correlated Radially Polarized Beams in Free Space

2019 ◽  
Vol 9 (5) ◽  
pp. 997
Author(s):  
Lina Guo ◽  
Li Chen ◽  
Rong Lin ◽  
Minghui Zhang ◽  
Yiming Dong ◽  
...  
Keyword(s):  
Free Space ◽  
Degree Of Polarization ◽  
Average Intensity ◽  
Polarized Beams ◽  
Diffraction Integral ◽  
Spectral Density Matrix ◽  
Potential Applications ◽  
Spectral Degree ◽  
Propagation Properties ◽  
Radially Polarized

A specially correlated radially polarized (SCRP) beam with unusual physical properties on propagation in the paraxial regime was introduced and generated recently. In this paper, we extend the paraxial propagation of an SCRP beam to the nonparaxial regime. The closed-form 3 × 3 cross-spectral density matrix of a nonparaxial SCRP beam propagating in free space is derived with the aid of the generalized Rayleigh–Sommerfeld diffraction integral. The statistical properties, such as average intensity, degree of polarization, and spectral degree of coherence, are studied comparatively for the nonparaxial SCRP beam and the partially coherent radially polarized (PCRP) beam with a conventional Gaussian–Schell-model correlation function. It is found that the nonparaxial properties of an SCRP beam are strikingly different from those of a PCRP beam. These nonparaxial properties are closely related to the correlation functions and the beam waist width. Our results may find potential applications in beam shaping and optical trapping in nonparaxial systems.

Optically Controlled Light Propagation in Dye-Doped Nematic Liquid Crystals with Homogeneous Alignment

2011 ◽  
Vol 497 ◽  
pp. 142-146
Author(s):  
Tomoyuki Sasaki ◽  
Kenta Miura ◽  
Hiroshi Ono ◽  
Osamu Hanaizumi
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Absorption Band ◽  
Temperature Variation ◽  
Light Propagation ◽  
Light Signal ◽  
Photothermal Effect ◽  
Absorption Of Light ◽  
Control Light

Light propagation in an optical waveguide fabricated by employing a dye-doped liquid crystal (DDLC) was observed. The propagation of a light signal in the waveguide was varied by irradiation with a control light whose wavelength was in the absorption band of the DDLC. By considering the photothermal effect of the DDLC, which enables the change of the refractive index due to temperature variation based on the absorption of light, we qualitatively explained the observed light propagation and demonstrated manipulation of the propagation.

Three-dimensional extension of Bresenham's algorithm and its application in straight-line interpolation

2002 ◽  
Vol 216 (3) ◽  
pp. 459-463 ◽  
Author(s):  
X-W Liu ◽  
K Cheng
Keyword(s):  
Line Segment ◽  
Three Dimensional ◽  
Straight Line Segment ◽  
Numerical Control ◽  
Interpolation Algorithm ◽  
Straight Line ◽  
Actual Error ◽  
Potential Applications ◽  
Sample Position ◽  
Straight Lines

Conventional straight-line generating algorithms, such as the digital differential analyser (DDA), Bresenham's algorithm and the mid-point algorithm, are suitable only for planer straight lines on the coordinate planes, of which Bresenham's algorithm is the most efficient. In this paper, the authors have extended Bresenham's algorithm to spatial straight lines. Given a spatial straight-line segment with two end-points, the authors have applied Bresenham's algorithm to the projections of the line segment on two of the three coordinate planes, which is determined by the largest of the coordinate lengths of the line segment, thereby obtaining a three-dimensional extension of the algorithm. In a case study, the authors calculated the distance between each sample position and the given line segment. The result reveals that the actual error at each sample position is smaller than the maximum theoretical error, and the performance of the three-dimensional extension of Bresenham's algorithm is as good as that of Bresenham's original planer algorithm. One of its potential applications is the three-dimensional step straight-line interpolation used in computer numerical control (CNC) systems of machine tools and rapid prototyping machines. Application of the algorithm is contrasted with that of the traditional DDA step straight-line interpolation algorithm. The result confirms that the three-dimensional extension of Bresenham's algorithm is much better than the DDA straight-line interpolation algorithm.

Diffusive reflectance for the free-space light propagation theory

2010 ◽  
Vol 96 (1) ◽  
pp. 013702 ◽  
Author(s):  
Yuanzheng Si ◽  
Heng Mao ◽  
Bin Zhang ◽  
Ming Jiang
Keyword(s):  
Free Space ◽  
Light Propagation ◽  
Propagation Theory

Soliton-Like Light Propagation through Coupled Resonators Constructed with Periodic Metal-Dielectric Layers

2013 ◽  
Vol 339 ◽  
pp. 706-713
Author(s):  
Yu Guang Zhu ◽  
Yun Tuan Fang ◽  
Wei Li Hu ◽  
Wei Zhong Yan
Keyword(s):  
Group Velocity ◽  
Free Space ◽  
Light Propagation ◽  
Tight Binding ◽  
Coupled Resonators ◽  
Light Velocity ◽  
One Dimensional ◽  
Resonator Structure ◽  
Transmission Mechanisms ◽  
Dielectric Layers

in order to obtain a soliton-like light propagation, we design a coupled resonator structure constructed with one-dimensional periodic metal-dielectric layers. Through tight-binding analysis and the Blochs theorem, we study its transmission mechanisms. Basing on the transmission mechanisms, we achieve a soliton-like light propagation in it with a group velocity being smaller light velocity in free space.

Biopolymeric photonic structures: design, fabrication, and emerging applications

2020 ◽  
Vol 49 (3) ◽  
pp. 983-1031 ◽  
Author(s):  
Rui Xiong ◽  
Jingyi Luan ◽  
Saewon Kang ◽  
Chunhong Ye ◽  
Srikanth Singamaneni ◽  
...  
Keyword(s):  
Light Propagation ◽  
Hierarchical Structures ◽  
Photonic Structures ◽  
Control Light

Biological photonic structures can precisely control light propagation, scattering, and emission via hierarchical structures and diverse chemistry, enabling biophotonic applications for transparency, camouflaging, protection, mimicking and signaling.

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