Light intensity fluctuations on a layered microsphere irradiated by a monochromatic light wave: Modeling of an inhomogeneous cellular surface with numerical elements

2007 ◽  
Vol 137 (1-3) ◽  
pp. 138-143 ◽  
Author(s):  
Moon Kyu Choi
Keyword(s):  
Light Intensity ◽  
Light Wave ◽  
Monochromatic Light ◽  
Wave Modeling ◽  
Intensity Fluctuations

scholarly journals Prediction of the Bandgap of a Core-Shell Microsphere via Light Intensity Fluctuations

2011 ◽  
Vol 2011 ◽  
pp. 1-6
Author(s):  
Moon Kyu Choi ◽  
Youngjin Choi
Keyword(s):  
Numerical Simulation ◽  
Refractive Index ◽  
Boundary Element Method ◽  
Light Intensity ◽  
Boundary Element ◽  
Light Wave ◽  
Monochromatic Light ◽  
Wavelength Shift ◽  
Core Shell ◽  
Absorption Wavelength

It has been experimentally observed that in the case of microspheres irradiated by light, the absorption wavelength shift occurs, known as the blueshift, with changing shell materials (i.e., by decreasing the refractive index of the shell). In the present investigation, we want to demonstrate it numerically by using the boundary element method. The material used for the simulation is a core-shell (SiO2and another material of a larger refractive index) microsphere and it is irradiated by unpolarized monochromatic light wave. This paper intends to demonstrate that it is possible to predict the bandgap of a core-shell microsphere resulting from two different bandgap materials and that the numerical simulation employed produces the blueshift.

Trends in the development of sensor devices based on surface plasmon resonance (Review)

2021 ◽  
Vol 56 ◽  
pp. 5-26
Author(s):  
A. V. Samoylov ◽  
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmons ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Light Wave ◽  
Monochromatic Light ◽  
Dielectric Substrate ◽  
Spr Imaging ◽  
Imaging Sensors ◽  
Polarization Contrast

Trends in the development of modern sensory devices based on surface plasmon resonance (SPR) are considered. The basic principles of construction of SPR sensor are given. For excitation of surface plasmons on the surface of sensitive elements of biosensory, a prism of total internal reflection is used or a dielectric substrate are used. A thin (dozens nm) film of high-conductive metal (mainly gold or silver) is applied to the working surface of the prisms or dielectric substrate. In a typical observation experiment, SPR is measured dependence on the angle of increasing light intensity, reflected by the resonance sensitive surface of the prism (chip). The optical schemes and principles of work of various SPR sensors are considered: - SPR Sensors with angular modulation, which are the most commonly used method based on the corner registration, in which the SPR occurs. The surface of the metal film is irradiated by monochromatic light and scans on a certain range of angles. There is a kind of SPR sensors with angular modulation, in which there is no mechanical scan of the angle of fall. Such sensors are entirely necessary for excitation of PPRs a set of angles is obtained due to a divergent or convergent light beam. - PPR sensors with a wavelength modulation is based on fixing an angle of falling light at a certain value and modulation of the wavelength of the incident light. Excitation of surface plasmons leads to a characteristic failure in the spectrum of reflected radiation. - Phase sensitive SPR sensors in which a change in the phase of the light wave associated with the surface plasma is measured on one corner of the fall and the wavelength of the light wave and is used as the output signal. - SPR imaging sensors in which the Technology of SPR imaging (SPRi) combines the sensitivity of the SPR with spatial image capabilities. The SPRI circuit uses as a fixed angle (as a rule, a slightly left angle of the SPR) and a fixed wavelength to measure changes in the reflection ability (Δ% R) that occur when the curve of the SPR is shifted due to the change in the refractive index above the surface of the sensor element. - SPR imaging sensors polarization contrast. In order to improve the quality of high-performance SPR imaging sensors in terms of sensitivity and resolution, the method of polarization contrast is used Disadvantages and advantages of SPR sensors are constructed with different principles are considered. The design and prospect of the use of achromatic and suburchast wave plates in the PPR imaging sensors with polarization contrast are considered.

Light intensity fluctuations in backscatter from a turbulent medium

1984 ◽  
Vol 27 (10) ◽  
pp. 890-894 ◽  
Author(s):  
S. S. Kashkarov ◽  
T. N. Nesterova ◽  
A. S. Smirnov
Keyword(s):  
Light Intensity ◽  
Turbulent Medium ◽  
Intensity Fluctuations

Phase coherence in multiple scattering: weak and intense monochromatic light wave propagating in a cold strontium cloud

2005 ◽  
Author(s):  
David Wilkowski ◽  
Yannick Bidel ◽  
Thierry Chaneliere ◽  
Robin Kaiser ◽  
Bruce Klappauf ◽  
...  
Keyword(s):  
Multiple Scattering ◽  
Light Wave ◽  
Monochromatic Light ◽  
Phase Coherence
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