scholarly journals Mechanical Action of Inhomogeneously Polarized Optical Fields and Detection of the Internal Energy Flows

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
A. Ya. Bekshaev ◽  
O. V. Angelsky ◽  
S. V. Sviridova ◽  
C. Yu. Zenkova
Keyword(s):  
Internal Energy ◽  
Energy Flow ◽  
Plane Waves ◽  
Particle Interaction ◽  
Mechanical Action ◽  
Gradient Force ◽  
Optical Fields ◽  
Energy Flows ◽  
Dipole Force ◽  
Spherical Microparticle

We analyze numerically correspondence between the mechanical action, experienced by a spherical microparticle, and the internal energy flows in the light field incident on the particle. The inhomogeneous incident field is modelled by superposition of two plane waves; the mechanical action is calculated via the Mie theory for dielectric and conducting particles of different sizes and optical properties. It is shown that both spin and orbital components of the field momentum can produce the mechanical action whose value and sign depend on many additional details of the field-particle interaction. Besides, forces that are not associated with any sort of the energy flow (e.g., the gradient force owing to the inhomogeneous intensity and the polarization-dependent dipole force emerging due to inhomogeneous polarization) can strongly modify the observed mechanical action. The polarization-dependent mechanical action on particles can be treated as a form of the spin-orbit interaction of light.

Visualization of internal energy flows in optical fields carrying a pair of fractional vortices

2013 ◽  
Vol 60 (13) ◽  
pp. 1027-1036 ◽  
Author(s):  
Brijesh Kumar Singh ◽  
Dalip Singh Mehta ◽  
Paramasivam Senthilkumaran
Keyword(s):  
Internal Energy ◽  
Optical Fields ◽  
Energy Flows ◽  
Fractional Vortices

scholarly journals Orbital rotation without orbital angular momentum: mechanical action of the spin part of the internal energy flow in light beams

2012 ◽  
Vol 20 (4) ◽  
pp. 3563 ◽  
Author(s):  
O. V. Angelsky ◽  
A. Ya. Bekshaev ◽  
P. P. Maksimyak ◽  
A. P. Maksimyak ◽  
S. G. Hanson ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Internal Energy ◽  
Orbital Angular Momentum ◽  
Energy Flow ◽  
Mechanical Action ◽  
Spin Part ◽  
Orbital Rotation ◽  
Light Beams

scholarly journals Structured Light Control and Diagnostics Using Optical Crystals

2021 ◽  
Vol 9 ◽  
Author(s):  
O. V. Angelsky ◽  
A. Y. Bekshaev ◽  
G. S. Dragan ◽  
P. P. Maksimyak ◽  
C. Yu. Zenkova ◽  
...  
Keyword(s):  
Internal Energy ◽  
Structured Light ◽  
Incident Beam ◽  
Mechanical Action ◽  
Beam Polarization ◽  
Light Fields ◽  
Energy Flows ◽  
Light Waves ◽  
Optical Crystals ◽  
Phase Singularities

We describe experimental results exposing the possibilities of optical crystals, especially anisotropic and birefringent, for creation, control, and diagnostics of structured light fields with singular and extraordinary properties. The efficiency of birefringent media is demonstrated for purposeful generation of optical beams with phase singularities (optical vortices) and desirable patterns of internal energy flows, in both the mono- and polychromatic light. On the other hand, anisotropic micro-objects can be used as probing bodies for investigation of the peculiar features of internal energy flows and corresponding momentum and angular momentum distributions in structured light fields. In particular, the specific mechanical action of light fields, formed under the total-reflection conditions, has been detected that confirms the existence of “extraordinary” dynamical characteristics of evanescent light waves predicted theoretically: the “transverse” momentum and “vertical” spin and their dependence on the incident beam polarization. The results can be useful for the optical trapping and micromanipulation techniques, including the biomedical and pharmaceutical applications.

The mechanical action of the spin part of the internal energy flow

2012 ◽  
Author(s):  
O. V. Angelsky ◽  
A. Y. Bekshaev ◽  
P. P. Maksimyak ◽  
C. Y. Zenkova ◽  
A. P. Maksimyak ◽  
...  
Keyword(s):  
Internal Energy ◽  
Energy Flow ◽  
Mechanical Action ◽  
Spin Part

Statistical energy analysis as a tool for quantifying sound and vibration transmission paths

1994 ◽  
Vol 346 (1681) ◽  
pp. 449-464 ◽  
Keyword(s):  
Energy Flow ◽  
Complex Structure ◽  
Linear Equations ◽  
Least Square ◽  
Net Energy ◽  
Sea Temperature ◽  
Energy Flows ◽  
The Difference ◽  
Symmetry Relations ◽  
Loss Factors

When a complex structure is excited in several different ways by different sources, the sea energy balance equations result in a set of linear equations that can be used to calculate loss factors, coupling loss factors or net energy flows and incoming powers. If certain symmetry relations are used, and/or if some prior knowledge about the system is available, the set of linear equations is overdetermined and can be solved by a least square technique. A good indicator for the direction of the energy flow is the SEA temperature of the subsystems. Experiments and computer simulations performed on three plate arrangements gave in general good results when the coupling was weak and there were more than three modes in the frequency band of interest. Not so good results were obtained when a small energy flow has to be measured as the difference of large quantities.

Diffusion equation modelling for energy flow analysis in reverberation chambers

2021 ◽  
Vol 263 (1) ◽  
pp. 5637-5642
Author(s):  
Ryan Hao ◽  
Ning Xiang
Keyword(s):  
Diffusion Equation ◽  
Energy Flow ◽  
Flow Analysis ◽  
Equation Model ◽  
Computationally Efficient ◽  
Reverberation Chamber ◽  
Sound Fields ◽  
Energy Flows ◽  
Standardized Measurement ◽  
Reverberation Chambers

Noise is a growing concern in the built environment. Sound absorbers are a viable option for noise treatment. However, the characterization of their absorption coefficient in standardized measurement chambers still show challenges for high accuracy as required in practice. In recent years, experimental analysis has shown that assumptions of diffuse sound fields made in well-known reverberation chambers are unfulfilled. Specifically, that sound intensities in chamber-based measurement methods are presumed to be isotropic or diffuse. Diffusion equation models have shown dramatic changes in energy flow in the presence of highly absorptive materials under test. This has been attributed to well-documented inconsistencies reported from reverberation chamber measurements across different laboratories. This work will demonstrate that the diffusion equation model is proving to be a computationally efficient and viable method for predicting sound energy flows, garnering an increasing amount of interest from the acoustical community.

Optomechanical Interactions

2020 ◽  
pp. 105-128
Author(s):  
Ivan Favero
Keyword(s):  
Radiation Pressure ◽  
Hamiltonian Formulation ◽  
Mechanical Action ◽  
Gradient Force ◽  
Optical Forces ◽  
Hamiltonian Description ◽  
Optomechanical Systems ◽  
Equal Footing ◽  
Scientific Potential ◽  
Effects Of Radiation

Light exerts mechanical action on matter through various mechanisms, the most famous being radiation pressure, with the associated picture of a photon bouncing on a perfectly reflective movable mirror and transferring twice its momentum. But still today, unambiguously observing the effects of radiation pressure remains a challenge. In the quantum domain, the radiation pressure interaction between a moving mirror and light stored in a cavity accepts a simple Hamiltonian formulation. But this Hamiltonian description is sometimes oversimplified and underestimates or misses other mechanical effects of light accompanying radiation pressure in experiments. In this chapter, we will not only address radiation pressure but also other relevant optical forces such as the optical gradient force, electrostriction, or the photothermal and optoelectronic forces, which are key in micro- and nanoscale devices and must all be controlled on an equal footing to fully harness the technological and scientific potential of miniature optomechanical systems.

Energy Balance of Indian Villages: A Case Study of Seven Villages

2018 ◽  
Vol 1 (1) ◽  
pp. 77-103
Author(s):  
Amit Garg ◽  
Jaypalsinh Chauhan ◽  
Abha Chhabra ◽  
Tirthankar Nag
Keyword(s):  
Energy Balance ◽  
Energy Flow ◽  
Flow Model ◽  
Crop Yields ◽  
Gujarat State ◽  
Forest Density ◽  
Residential Sector ◽  
Energy Flows ◽  
Stock Change

This paper estimates the rural energy balance of 7 Indian villages of different agro-climate zones. This was done through primary survey of households in each village covering energy consumption, production, export, import and stock change across Crop, Livestock, Industry/Trade, Tree outside forest/plantations and Residential Sector. An energy flow model was created to capture all the various energy flows at household levels. Two villages are showing Negative annual energy balance—one is the desert village of Gujarat state and another is a tribal village of Mizoram state. All other villages were found to be energy positive mainly due to high forest density and high crop yields.

Study of internal energy flows in dipole vortex beams by knife edge test

2013 ◽  
Vol 293 ◽  
pp. 15-21 ◽  
Author(s):  
Brijesh Kumar Singh ◽  
Monika Bahl ◽  
Dalip Singh Mehta ◽  
Paramasivam Senthilkumaran
Keyword(s):  
Internal Energy ◽  
Knife Edge ◽  
Energy Flows ◽  
Dipole Vortex ◽  
Vortex Beams
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