Propagation properties and radiation forces of the Hermite–Gaussian vortex beam in a medium with a parabolic refractive index

2020 ◽  
Vol 59 (27) ◽  
pp. 8342 ◽  
Author(s):  
You Wu ◽  
Jinhong Wu ◽  
Zejia Lin ◽  
Xinming Fu ◽  
Huixin Qiu ◽  
...  
Keyword(s):  
Refractive Index ◽  
Vortex Beam ◽  
Radiation Forces ◽  
Propagation Properties

SPATIAL XPM-PAIRED SOLITONS IN NONLINEAR METAMATERIALS

2013 ◽  
Vol 22 (01) ◽  
pp. 1350009
Author(s):  
ANLE FANG ◽  
YUANJIANG XIANG ◽  
BINXIAN ZHUANG ◽  
LEYONG JIANG ◽  
XIAOYU DAI ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fibers ◽  
Function Method ◽  
Hyperbolic Function ◽  
Nonlinear Polarization ◽  
Dark Solitons ◽  
Nonlinear Metamaterials ◽  
Theoretical Predictions ◽  
Hyperbolic Function Method ◽  
Propagation Properties

We investigate spatial XPM-paired solitons in nonlinear metamaterials (MMs) based on the (1 + 1)-dimensional coupled nonlinear Schrodinger equation (NLSE) describing the co-propagation of two optical beams of different frequencies in the MM with a Kerr-type nonlinear polarization. Three types of XPM-paired solitons including bright-bright, bright-dark and dark-dark solitons for different combination of the signs of refractive index experienced by the two beams, respectively, are obtained by using a generalized hyperbolic function method, which makes the temporal XPM-paired solitons in optical fibers find their spatial counterparts in MMs. Numerical simulations are performed to confirm the theoretical predictions and further identify the propagation properties of the spatial XPM-paired solitons in MMs described by Drude model.

Radiation forces of focused partially coherent vortex beam acting on Rayleigh particles with different refractive indices

2011 ◽  
Vol 23 (2) ◽  
pp. 319-324
Author(s):  
程科 Cheng Ke ◽  
向安平 Xiang Anping ◽  
钟先琼 Zhong Xianqiong ◽  
吕百达 Lü Baida
Keyword(s):  
Refractive Indices ◽  
Vortex Beam ◽  
Partially Coherent ◽  
Radiation Forces ◽  
Coherent Vortex

Refractive-Index Sensor Based on Metal-Insulator-Metal Waveguides

2015 ◽  
Vol 742 ◽  
pp. 46-49 ◽  
Author(s):  
Ting Ting Tang ◽  
Li Luo
Keyword(s):  
Refractive Index ◽  
Refractive Index Change ◽  
Dielectric Materials ◽  
Refractive Index Sensor ◽  
Total Size ◽  
Metal Insulator ◽  
Coupled Mode ◽  
Metal Insulator Metal ◽  
Structure Of Metal ◽  
Propagation Properties

We propose a refractive sensor based on directional coupling between two metal-insulator-metal (MIM) waveguides to measure the refractive index change of the insulator, which is designed to be with a structure of metal-insulator-metal-insulator-metal (MIMIM) in which surface plasmon waves (SPW) are excited. The propagation properties are analyzed by coupled mode theory, and the expressions about the coupling coefficient, coupling length and sensitivity are derived. The sensing properties based on simulation results are also discussed. Compared with a dielectric waveguide, the total size of our sensor with MIMIM waveguide is about one tenth that with dielectric materials, while the sensitivity is improved ten times larger than the former.

Radiation forces on a microsphere in an arbitrary refractive index profile

2012 ◽  
Vol 29 (3) ◽  
pp. 407 ◽  
Author(s):  
Kang Soo Lee ◽  
Sang Youl Yoon ◽  
Kyung Heon Lee ◽  
Sang Bok Kim ◽  
Hyung Jin Sung ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Profile ◽  
Index Profile ◽  
Radiation Forces

scholarly journals Propagation Properties of an Off-Axis Hollow Gaussian-Schell Model Vortex Beam in Anisotropic Oceanic Turbulence

2021 ◽  
Vol 9 (10) ◽  
pp. 1139
Author(s):  
Xinguang Wang ◽  
Le Wang ◽  
Shengmei Zhao
Keyword(s):  
Dissipation Rate ◽  
Beam Width ◽  
Average Intensity ◽  
Vortex Beam ◽  
Oceanic Turbulence ◽  
Beam Characteristic ◽  
Anisotropic Coefficient ◽  
Higher Temperature ◽  
Inner Scale ◽  
Propagation Properties

Based on the extended Huygens–Fresnel principle and the power spectrum of anisotropic oceanic turbulence, the analytical expressions of the average intensity and coherence properties of an off-axis hollow Gaussian-Schell model (OAHGSM) vortex beam propagating through anisotropic oceanic turbulence were derived. The effects of turbulent ocean and beam characteristic parameters on the evolution properties of the OAHGSM vortex beam were analyzed in detail. Our numerical simulation results showed that the OAHGSM vortex beam with a larger position factor is more focusable. Meanwhile, the OAHGSM vortex beam eventually evolves into a Gaussian-like beam after propagating through the anisotropic oceanic turbulent channel. The speed of this process can be accelerated by the decrease of the hollow order, topological charge, beam width, and transverse coherence width of the beam. The results also indicated that the normalized average intensity spreads more greatly and the spectral degree of coherence decays more rapidly for the smaller dissipation rate of the kinetic energy per unit mass of fluid, the smaller anisotropic coefficient, the smaller inner scale factor, the larger dissipation rate of the mean-squared temperature, and the higher temperature–salinity contribution ratio.

scholarly journals Effect of the turbulent biological tissues on the propagation properties of coherent Laguerre-Gaussian beams

2021 ◽  
Author(s):  
Ahmed Abdulrab Ali Ebrahim ◽  
Abdelmajid Belafhal
Keyword(s):  
Refractive Index ◽  
Biological Tissue ◽  
Propagation Distance ◽  
Biological Tissues ◽  
Gaussian Beams ◽  
Beam Spot ◽  
Spot Radius ◽  
Structural Constant ◽  
Propagation Properties ◽  
Effective Beam

Abstract In this paper, the effects of turbulent biological tissues (TBT) on the propagation properties of the coherent Laguerre-Gaussian (CLG) beams are studied. Based on the turbulence theory and using the power spectrum refractive-index model, the expression formulae of the average irradiance intensity and spreading properties of a CLG beam propagating in TBT are derived. The influence of propagation distance, beam orders, wavelengths and tissue turbulence parameters are then investigated numerically. It found that, the central dark zone of the circular/elliptical LG beams rises more rapidly as the propagation distance and the structural constant of the refractive index of the biological tissue increase and the beams become eventually more like Gaussian beams in the far-field under the influence of the turbulence biological tissues. Also, the numerical results proved that the effective beam spot radius increases as turbulence, wavelength, and propagation distance are increasing. Ultimately, the beams become circular under the influence of the turbulence of the biological tissue. As found that the effective beam spot radius along the x-axis becomes equal to that of the y-axis in high TBT which explain why an elliptical LG beam is converted into a circular one in higher structural constant of the turbulent tissue. Moreover, our results show that, the influence of the beam order m slightly greater than that of l on the beam spreading.

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