Transcript Multi-Channle Fabry Perot Etalon

•Objectives
•Sample Preparation
•Division of Work
•Test Procedure
•Background
•Results
•Mirror Fabrication
•Timeline
•Cavity Fabrication
•Future Work
•Biomaterials
•Conclusion
To design and build a proof of concept
experiment for a novel high sensitivity
biosensor based on a Fabry-Perot
cavity
Division of Work
Rui:
•
•
Initial Design Simulations and Evaluation
o Sims Approach Research and Evaluation
o MS Excel
Biomaterial Sample Prep
Jarrod:
•
Fabricate device for testing
o Obtain materials
o Assemble the prototypes
•
Build test setup
Emile:

Write test programs to acquire data
◦ Control instruments
◦ Demodulate the signal
◦ Graph results
◦ Automate the testing/graphing procedure
Background

R=.3
R=.9
R=.5
λm-1
λm+1
λm
Important Properties of a F-P Cavity:
• Free Spectral Range:  
• Finesse: F 
2
2nL
 m  1  m
 R
1 R
• Resonant Condition:
mm  2nL
where m=1,2,3 …
Glass
Glass
Glass
Glass
Glass
Air
Mirrors
Glass
Glass
Glass
Glass
Glass
Glass
Glass
Air
Glass
Glass
BIO Material
Glass
Glass
Mirror
Glass
Glass
Mirror
Glass
Air
Air
Glass
Glass
Glass
Glass
Mirror
Glass
Glass
Glass
Glass
Air
Air
Glass
Glass
BIO Material
Glass
Mirror
Mirror Fabrication
Mirrors will be formed using AJA 7000 Sputtering System
• Many metal coatings available
• Au, Ag, Al, Ti, Ni, Cr
• Low pressure for high quality films
• Precise control of the thickness
Mirror Fabrication
Gold
Titanium
Glass
Mirror Testing
1
Transmission of Mirrors
0.9
Transmission @ 1.55µm
0.8
0.7
Glass
10Å Ti / 40Å Au
0.6
0.5
0.4
Glass: 87%
10Å Ti / 40Å Au: 47%
10Å Ti / 70Å Au
0.3
10Å Ti / 70Å Au: 18%
0.2
0.1
0
Wavelength (um)
Cavity Fabrication
Cavity Fabrication
Cavity Fabrication
Verification of Cavity
-50
-55
-60
Output Power Spectrum (dBm)
-65
-70
-75
-80
-85
-90
1530
1535
1540
1545
1550
Wavelength (nm)
1555
1560
1565
1570
Cavity Fabrication
Reason for Failure:
•Only 150Å of gold
• Missing the “sticking layer”
Solution:
• Use a sticking layer
• Can be Ni, Ti, Cr
•Biomaterials in cavities:
•Protein G
•IgG
•Fab
•Same Concentration for all experimental setups
Coating Biomaterials
Glass
Protein G
IgG
IgG
Gold
Protein G
Glass
Testing Block Diagram
GPIB/IEEE Cable
PC/Matlab
Single Mode Fiber
Micron Optics si720
Optical Sensing Analyzer
Detected light
Power Input
Test Setup
Start
Folder/File location to save
data
Start/Stop Wavelengths
Figure
Run Matlab GUI
Locate File/Folder Location
to save data
Start/Stop Wavelengths
-Set the Start/Stop Wavelengths
on Optical Analyzer
Start
Show Results
-Start Sweeping through wavelengths
-Get data results and save them
in specified folder
3
0
J
a
n
Literature Review
Simulations
Prepare for Report I and
Presentartion
Procure Raw Materials
Form Mirrors and
Assemble Cavity
Write Code for Testing
Build Test Set up and
Preform Experiments
Prepare for Report II and
Presentation
Data Analysis / Retest
Prepare Final Report and
Presentation
6Feb
13Feb
20Feb
27Feb
5Mar
12Mar
19Mar
26Mar
2Apr
9Apr
16Apr
23Apr
30Apr
714May May
Future Work
1. Multi-channel Fabry-Perot cavity
waveguide structure.
Mirrored Ends
Multiple Channels
Silicon Waveguide
Silicon Substrate
Silicon substrate
Future Work
1. Multi-channel Fabry-Perot cavity
waveguide structure
2. Integrated with microfluidics
Biomaterials
Fluid Cavity
Polymer
Cap
Waveguide with microfluidics
Benefits:
• Reduced device size
• Can create more channels for biomaterials
• Enables mass production
• Uniform device size
Biomaterials
Conclusion
• Fabrication of Cavities is feasible
• Goal has been reached
• Introduce mirror reflectivity as a variable when testing