Sensitivity Enhancement of Surface Plasmon Resonance Sensor with Two Dimensional Materials Covered on Silver-Nickel Bimetallic Thin Solid Films

2020 ◽  
Vol 18 (10) ◽  
pp. 776-779
Author(s):  
L. Castañeda
Keyword(s):  
2D Materials ◽  
Sensitivity Enhancement ◽  
Thin Solid Films ◽  
Solid Films ◽  
Kretschmann Configuration ◽  
Enhanced Sensitivity ◽  
Resonance Sensor ◽  
Two Dimensional Materials ◽  
Fresnel Equation ◽  
Hybrid Configuration

In this paper a new sensing configuration with enhanced sensitivity utilizing 2D materials on the bimetallic layers of Magnetic Material Ni over Ag for Kretschmann configuration is proposed and analyzed numerically using Fresnel equation and transfer matrix method. Results show that such a hybrid configuration with well optimized thickness of metallic layer and utilization of specific no. of 2D materials can increases the sensitivity as high as 298°/RIU is absorbed for the configuration consist 10 nm of Ni over 40 nm thickness of Ag added with a 2 layers of WSe2.

A Comparison of Transparent Boundary Conditions for the Fresnel Equation

2001 ◽  
Vol 168 (2) ◽  
pp. 433-444 ◽  
Author(s):  
David Yevick ◽  
Tilmann Friese ◽  
Frank Schmidt
Keyword(s):  
Boundary Conditions ◽  
Transparent Boundary Conditions ◽  
Fresnel Equation

Observation of the Berreman Effect in Infrared Reflection-Absorption Spectra of Amorphous Titanium Oxide Thin Films Deposited on Aluminum

2000 ◽  
Vol 54 (5) ◽  
pp. 687-691 ◽  
Author(s):  
B. C. Trasferetti ◽  
C. U. Davanzo ◽  
N. C. da Cruz ◽  
M. A. B. de Moraes
Keyword(s):  
Thin Films ◽  
Absorption Spectra ◽  
Optical Constants ◽  
Polarized Light ◽  
Chemical Vapor ◽  
Layered System ◽  
Infrared Reflection ◽  
Fresnel Equation ◽  
Successful Technique

Infrared reflection-absorption spectra of plasma-enhanced chemical vapor deposition (PECVD) amorphous TiO2 thin films on aluminum were obtained with s- and p-polarized light and oblique incidence angles. Such spectra were analyzed by means of spectral simulations based on a Fresnel equation for a three-layered system. The optical constants used in the simulations were obtained through the Kramers–Krönig analysis of the reflectance spectra of a pellet of powdered amorphous TiO2. LO-TO energy-loss functions were also calculated from these optical constants, and a splitting was observed. A good qualitative agreement between experimental and simulated spectra was achieved, and the Berreman effect was observed in both cases when p-polarized light was used. It was shown, therefore, that the Berreman effect makes infrared reflection-absorption spectroscopy a successful technique for the characterization of an amorphous TiO2 thin layer on aluminum.

scholarly journals Determination of the Optical Properties of Thylakoid Membranes from Whole Leaf Reflectance Measurements Using a Capacitor and Unbound Electron Model

2021 ◽  
Author(s):  
Ranjan S Muttiah
Keyword(s):  
Relaxation Times ◽  
Thylakoid Membranes ◽  
Skin Depth ◽  
Brewster Angle ◽  
Angle Of Incidence ◽  
Electron Model ◽  
Leaf Reflectance ◽  
Fresnel Equation ◽  
Reflectance Measurements

This paper demonstrates that a capacitor equivalent along with unbound electrons can be used to model thylakoid membranes in grana stacks. From whole leaf reflectance measurements at normal incidences at 660nm wavelength and taken from the literature, refractive indices are obtained from the Fresnel equation for transverse electric (TE) and transverse magnetic (TM) polarization. The TE and TM polarizations for external reflectance depict the Brewster angle at which the magnitude of the reflected electric vector is zero; the internal reflections show that there is a narrow angle window of about 10 degrees before the internally refracted light goes into critical angle. The clustering and separation of reflection measurements with angle of incidence is explained using Fresnel equation; the cross-over angle is located beyond the Brewster angle for internal reflection. The predicted relaxation times from a capacitor and unbound electron model gave favorable comparisons against commonly reported fluorescence times in the 0.1 to 1 ns range (our results gave 0.5-0.8 ns). The di-electric constant for the membrane is estimated to be 5. The stacking number (number of grana layers) is consistent with the light penetration depth (skin depth). The magnetic permeability was shown to be close to that of vacuum and therefore the thylakoid lacks any magnetic properties as would be expected for such a transparent media. An in-vivo estimate based on thermal equilibrium of molecules for the permanent dipole moment of the chlorophyll molecule gave 2,025D (Debye).

Solving Fresnel equation for refractive index using reflected optical power obtained from Bessel beam interferometry

2019 ◽  
Vol 90 (1) ◽  
pp. 015110 ◽  
Author(s):  
Pooja Gupta ◽  
Amit Pandey ◽  
Kaushal Vairagi ◽  
Samir K. Mondal
Keyword(s):  
Refractive Index ◽  
Bessel Beam ◽  
Optical Power ◽  
Fresnel Equation

A Side-Coupled Optical-Fiber Liquid Level Sensor

2011 ◽  
Vol 128-129 ◽  
pp. 487-490
Author(s):  
Cheng Rui Zhao ◽  
Lin Ye ◽  
Jun Feng Ge ◽  
Yi Cheng
Keyword(s):  
Optical Fiber ◽  
The Other ◽  
Liquid Level ◽  
Instrumentation Amplifier ◽  
Parallel Side ◽  
Level Sensor ◽  
Fresnel Equation ◽  
Signal Processing Circuit ◽  
Liquid Level Sensor ◽  
Processing Circuit

A side-coupled optical-fiber liquid level sensor is proposed to realize intrinsically safe measurement to liquid level in flammable environments. The sensor consists of two parallel side-polished fibers is based on the different coupling coefficient between the fibers in different media according to the Fresnel equation. One of the fibers is for emitting and the other is for receiving, and a reflector is attached to the end of the fibers to enhance the power of light. The power of the light from the top of receiving fiber is measured by the signal processing circuit which is mainly organized by an instrumentation amplifier and a correlator. This sensor is fabricated in the laboratory and the results of the experiments show good performance. It is demonstrated that the sensor is safe and sensitive, but there is still a lot of work to do before its commercial usage.

scholarly journals GENERALLY COVARIANT FRESNEL EQUATION AND THE EMERGENCE OF THE LIGHT CONE STRUCTURE IN LINEAR PRE-METRIC ELECTRODYNAMICS

2002 ◽  
Vol 11 (08) ◽  
pp. 1227-1242 ◽  
Author(s):  
GUILLERMO F. RUBILAR ◽  
YURI N. OBUKHOV ◽  
FRIEDRICH W. HEHL
Keyword(s):  
Light Cone ◽  
Electromagnetic Waves ◽  
Light Propagation ◽  
Electromagnetic Excitation ◽  
Independent Components ◽  
Cone Structure ◽  
Axion Field ◽  
Fresnel Equation ◽  
Generally Covariant ◽  
Cubic Function

We study the propagation of electromagnetic waves in a spacetime devoid of a metric but equipped with a linear electromagnetic spacetime relation H ~ χ · F. Here H is the electromagnetic excitation [Formula: see text] and F the field strength (E,B), whereas χ (having 36 independent components) characterizes the electromagnetic permittivity/permeability of spacetime. We derive analytically the corresponding Fresnel equation and show that it is always quartic in the wave covectors. We study the "Fresnel tensor density" [Formula: see text] as (cubic) function of χ and identify the leading part of χ (20 components) as indispensable for light propagation. Upon requiring electric-magnetic reciprocity of the spacetime relation, the leading part of χ induces the light cone structure of spacetime (9 components), i.e., the spacetime metric up to a function. The possible existence of an Abelian axion field (1 component of χ) and/or of a skewon field (15 components) and their effect on light propagation is discussed in detail. The newly introduced skewon field is expected to be T-odd and related to dissipation.

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