Anthony Anderson, Erick Ballesteros, Adam Garcia, Edgar...
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•The photodiode will receive strongest intensity at the critical angle and through this angle we can calculate the index of refraction. •The test setup detects the index of refraction versus angle so a shift in the index of refraction can be seen if there is also a shift in the critical angle. •A fixed laser was aimed at a sample on a pivot. •Sample would rotate and power meter would follow the reflected ray. •Power meter recorded the absorbance as an electrical input. •Intensity vs. Angle was plotted and Critical angle was found. •Critical angle between magnetic field and no magnetic field was compared. •To find a material that displays magnetorefractive properties. •To detect a shift in the index of refraction of the material. •To model setup using MATLAB to verify results. •Magnetorefractive materials show great promise in optical fiber technology. •Theory suggests a dependence of a magnetic field (H) to an index of refraction (n). •To date, no materials have displayed this property. •If such a material is found, then magnetically sensitive optical fibers can be produced. •Lanthanum Strontium Manganite (LSMO) is the first material to hint at this property. •This relationship between the index of refraction and the critical angle (Q c ) allows easy detection of the index of refraction. Fabricating and Characterizing Magnetorefractive Glass NSF Engineering Research Center 11-537 for Translational Applications of Nanoscale Multiferroic Systems (TANMS) Anthony Anderson, Erick Ballesteros, Adam Garcia, Edgar Mendoza, Sabina Ula Scott M. Strutner, Gregory P. Carman Department of Mechanical and Aerospace Engineering - University of California, Los Angeles University of California, Los Angeles University of California, Berkeley Cornell University California State University, Northridge Swiss Federal Institute of Technology, ETH Zurich Acknowledgements This work was supported by the National Science Foundation through the Cooperative Agreement Award EEC-1160504 for Solicitation NSF 11-537 (TANMS) managed by Dr. Deborah J. Jackson Abstract Modern optical fibers are mainly used for telecommunication and transmission of data, but our lab proposes a novel application of optical fibers to detect magnetic fields. Our research focused on the characterization of a novel magnetorefractive glass. Theory and past literature suggests a relationship between the glass’ index of refraction and magnetic field. Our project utilizes an ellipsometer to find the index of refraction, and quantify its change upon application of a magnetic field. Preliminary data of the glass containing Lanthanum Strontium Manganite (LSMO) shows a slight shift in index, but within measurement noise; thus the data is inconclusive. Further experiments must be refined to minimize noise to verify this correlation. Once a confirmed correlation exists, the next step is the fabrication of a magnetorefractive waveguide. Test Setup Key Concepts •Refine setup to eliminate mechanical sources of error and reproduce results shown in preliminary testing. •Fit data to Fresnel’s equation over wide sample set using optimization techniques. •LSMO shows a slight shift in index of refraction when introduced to magnetic field. •Experimentation shows a shift in index from 1.5125 to 1.5127. •The results are within measurement noise and are inconclusive. Data MATLAB Validation of Experimental Data Experimental Data Collision Prevention Objectives H i H n , 4 , ) sin( c prism Sample n n Q Application Optical sensors sensitive to magnetic fields can detect nearby traffic to aid in collision prevention in low visibility Magnetically sensitive optical fibers can detect metal used in under- ground tunnels to aid Homeland Security Detecting Tunnels Intensity (W) Angle( ͦ) Intensity (W) Angle( ͦ) Intensity (W) Angle( ͦ) Results MATLAB simulations validate experimental results Future Work % Intensity (W) Angle( ͦ) Modeled Photodiode Signal vs. Incident Angle for LSMO Intensity vs. Angle Background
Transcript of Anthony Anderson, Erick Ballesteros, Adam Garcia, Edgar...
•The photodiode will receive strongest intensity at the critical angle and through this angle we can calculate the index of refraction.
•The test setup detects the index of refraction versus angle so a shift in the index of refraction can be seen if there is also a shift in the critical angle.
•A fixed laser was aimed at a sample on a pivot.
•Sample would rotate and power meter would follow the reflected ray.
•Power meter recorded the absorbance as an electrical input.
•Intensity vs. Angle was plotted and Critical angle was found.
•Critical angle between magnetic field and no magnetic field was compared.
•To find a material that displays magnetorefractive properties.
•To detect a shift in the index of refraction of the material.
•To model setup using MATLAB to verify results.
•Magnetorefractive materials show great promise in optical fiber technology.
•Theory suggests a dependence of a magnetic field (H) to an index of refraction (n). •To date, no materials have displayed this property.
•If such a material is found, then magnetically sensitive optical fibers can be produced.
•Lanthanum Strontium Manganite (LSMO) is the first material to hint at this property.
•This relationship between the index of refraction and the critical angle (Qc) allows easy detection of the index of refraction.
Fabricating and Characterizing
Magnetorefractive Glass
NSF Engineering Research Center 11-537 for
Translational Applications of Nanoscale Multiferroic Systems (TANMS)
Anthony Anderson, Erick Ballesteros, Adam Garcia, Edgar Mendoza, Sabina Ula
Scott M. Strutner, Gregory P. Carman
Department of Mechanical and Aerospace Engineering - University of California, Los Angeles
University of California, Los Angeles
University of California, Berkeley
Cornell University
California State University, Northridge
Swiss Federal Institute of Technology, ETH Zurich
Acknowledgements This work was supported by the National Science Foundation through the Cooperative Agreement Award EEC-1160504 for Solicitation NSF 11-537 (TANMS) managed by Dr. Deborah J. Jackson
Abstract Modern optical fibers are mainly used for telecommunication and transmission of data, but our lab proposes a novel application of optical fibers to detect magnetic fields. Our research focused on the characterization of a novel magnetorefractive glass. Theory and past literature suggests a relationship between the glass’ index of refraction and magnetic field. Our project utilizes an ellipsometer to find the index of refraction, and quantify its change upon application of a magnetic field. Preliminary data of the glass containing Lanthanum Strontium Manganite (LSMO) shows a slight shift in index, but within measurement noise; thus the data is inconclusive. Further experiments must be refined to minimize noise to verify this correlation. Once a confirmed correlation exists, the next step is the fabrication of a magnetorefractive waveguide.
Test Setup
Key Concepts
•Refine setup to eliminate mechanical sources of error and reproduce results shown in preliminary testing.
•Fit data to Fresnel’s equation over wide sample set using optimization techniques.
•LSMO shows a slight shift in index of refraction when introduced to magnetic field.
•Experimentation shows a shift in index from 1.5125 to 1.5127.
•The results are within measurement noise and are inconclusive.
Data
MATLAB Validation of Experimental Data
Experimental Data
Collision Prevention
Objectives
HiHn
,4,
)sin( c
prism
Sample
nn
Q
Application
Optical sensors sensitive to magnetic fields can detect nearby traffic to aid in collision prevention in low visibility
Magnetically sensitive optical fibers can detect
metal used in under- ground tunnels to aid
Homeland Security
Detecting Tunnels
Inte
nsi
ty (
W)
Angle( ͦ)
Inte
nsi
ty (
W)
Angle( ͦ) In
ten
sity
(W
)
Angle( ͦ)
Results MATLAB simulations validate experimental results
Future Work
% In
ten
sity
(W
)
Angle( ͦ)
Modeled Photodiode Signal vs. Incident Angle for LSMO
Intensity vs. Angle
Background
