photonics @ iitm
TRANSCRIPT
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PHOTONICS @ IIT-MADRAS
Current status + Future opportunities
Prof. Anil Prabhakar
Dept. of Electrical Engineering, IIT-Madras
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Photonics in EE
Component Technologies
SubsystemsInstruments
SystemsNetworks
Ananth, AnilBalaji, BijoyShanti
Anil, BalajiDeepa, Shanti
Hari, Mani
Activities span across basic laboratory research to commercialization
LaboratoriesExperimental OpticsFibre Laser LabGrating FabricationIntegrated OpticsOptical Networks
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Funding• Seed – Gururaj Deshpande
• 2.5 Gbps test bed, new lab, new group
• Multiplier Grants• Telecom Centre of Excellence – Fibre Bragg Grating Facility• IRDE, Dehradun – Fibre Laser Laboratory• IRDE, Dehradun – Silicon Photonics• DST – Nanophotonics Centre• DIT – Fibre optic sensors• DBT – Bio-photonics, Metrology
• Opportunities• Telecom: 100 Gbps test bed, QKD, photonic integrated circuits• Fibre Lasers for material processing• Bioengineering and biomedical applications
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Collaborations• Indo-Australian, Indo-Swiss, Indo-German
• Optical MEMS, nano-photonics
• Indo-EU (Dublin, Southampton)• All optical signal processing
• NCBS, Bangalore• Biophotonics
• INO• Passive optical network for the India-based Neutrino Observatory
• LIGO – India (MIT, Caltech, others)• International collaboration to observe gravity waves
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Silicon photonicsDesign Simulation & Analysis Fabrication
Characterization Packaged devices to market
1X8 powersplitter
DWDM channel interleaver
Bijoy K. Das / Integrated Optics Lab
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Directional Coupler on SOI
• Two S-bend waveguides
Cross Port
Bar Port
Input port
Asymmetric ridge waveguides
Bijoy K. Das / Integrated Optics Lab
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Towards an integrated SoI platformRing Resonator Distributed Bragg Reflector
MZI
pin basedMZI
Bijoy K. Das / Integrated Optics Lab
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Tunable MEMS diffraction grating
• Goal• To fabricate a diffraction grating whose period can be tuned
during operation.
• Technique• Surface micromachining• Electrostatic actuation
Grating structure (a) unactuated state (b) actuated state 1 (c) actuated state 2
Fabricated tunable grating structure with 24 microns period
Shanti Bhattacharya / MOEMS
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All optical wavelength conversionFour wave mixing between the CW pump and the pulsed probe result in the transfer of data from probe to the conjugate.
Conjugate
Probe
Data
10 GbpsDeepa V. / Optical Comm
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Fiber Bragg Gratings
• Resonant structures that have wavelength selective reflection
• Make very good sensors
• Fabricated using a phase mask and an excimer laser at 248 nm
0 2 4 6 8 10
6
20
34
48
62
76Temperature Map
Distance(Km)
Tem
pera
ture
[o C
]
Exp. 63 5 63 Deg.
Est. 63 5 63 Deg.
Balajis Srinivasan / Fibre Bragg Grating Faciltiy
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High power pulsed fiber lasers• Compact, rugged multi-KW level pulsed fiber lasers• Seed followed by single or dual stage amplifiers• Double clad or Large Mode Area (LMA) fibres
Balajis S./ Fibre Laser Laboratory
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Active Mode Locked Fibre Lasers
Regenerative mode lockingPulse width of 68ps
Optical cavity
Balajis S./ Fibre Laser Laboratory
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STED Microscopy
Pulsed STED causes less thermal damage to the sample
Must get 2 pulsed high intensity lasers to synchronize
Anil Prabhakar / Imaging and Flow Facility, NCBS
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Dark field plasmon coupled fluorescence
Incident laser beam at 532nm
Glass
Gold
PMMA + R6G
Objective
Anath K./ Experimental Optics Lab
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Label free plasmonic sensor – Reflective configuration
0 10 20 30 40 50 60 70 80 900.4
0.5
0.6
0.7
0.8
0.9
1
Incident angle
Re
flect
ivity
Reflectivity v/s Incident angle with variation in analyte index
1.321.331.341.351.361.37
Anath K./ Experimental Optics Lab
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Optical Coherence Tomography• Experimental Technique (Fourier Domain)
• Low coherence Interferometry
Cucumber slice (1.5 mm x 8 mm)
Human wrist pulse
Scotch tape
Need it for retinal imagingHealthcare Technology Innovation Centre
Shanti Bhattacharya / Experimental Optics Lab
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Microfluidic flow analyzer – HIV detection
Control Flow rate
F2 FluorescenceSi-APD400V bias
1550 nm CW modulated fiber laser + 3dB
635 nm pulsed laser
S
B1 B2
F1
F3a
FBG@635nm
FR1
FR2
Side Scatter @ 1550nm, InGaAs gated APD, 60V bias
1550 nm pulsed laser
F3b
5 deg offset
Anil Prabhakar / Imaging and Flow Facility, CCAMP
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Competitive AnalysisMethod of HIV
detectionMiniature flow
analyzerBC CyAn
ADPGuava
Easy-CyteBD
FACSCalibur
Price (INR) 1-2 lakhs 30-50 lakhs 30-50 lakhs 30-50 lakhs
Quantity of sample required 100-500µl 1-5ml 1-5ml 1-5ml
Cost per sample (INR) 100 500 500 500
Maintenance cost
Low High High High
Expertise requirement Low High High High
Portability High Low Low Low
Detection method
Parameters
Expertiserequirement
1 lakh ~ 1,400 Euro
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Mega Science Projects• Involving multiple universities• International collaborations• Taking on some grand challenges
• What is the role of Photonics?
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India-based Neutrino Observatory
Madurai
IIT Madras
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Iron Calorimeter (ICAL) Modules
Each module has 10,000 detectorsMagnetized iron plates (a very large electromagnet)
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Large Passive Optical Network
1 Mbps from each detector. 5 Mbps worst case8 rows x 8 columns on each plane, in each module
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Resistive Plate Chamber
64 c
hann
els
from
eac
h R
PC
for
x,y
loca
lizat
ion
Neutrinos ionize the inert gas, and generate an avalanche pulse picked up by 2” strips
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PON hardware – corner of each RPC
• Tx at 1310nm, -10 dBm, 1-5 Mbps• Rx at -35dBm• We can also look at 1x64 splitter• Need monitoring, timing, (x,y) and trigger information
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Gravitational-Wave Detectors
image credit: Luis Calcada
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Advanced LIGO
x10 better amplitude sensitivity
⇒ x1000 rate=(reach)3
⇒ 1 day of Advanced LIGO
» 1 year of Initial LIGO !
Slides on LIGO are courtesy the LIGO Scientific CollaborationSource: R. Adhikari, Caltech
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LIGO• Detection confidence
• Locate sources• Decompose the
polarization of gravitational waves
GEO VirgoTAMA/LCGT
A Global Network
1 2
θΔL =
c δt
INDIGO?
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Geographical relocation: science gains
Source localization error
Original plan2 +1 LIGO USA+ Virgo
LIGO-India plan1+1 LIGO USA+ Virgo+ LIGO India
LIGO-Aus plan1+1 LIGO USA+ Virgo+ LIGO Aus
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Advanced LIGO detectors
LASERAEI, Hannover
Germany
SuspensionGEO, UK
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Courtesy: Stan Whitcomb 30
Advanced LIGO Laser
• Design: Albert Einstein Institute, Germany• Higher power (reduce photon shot noise)
– 10W 180W• 10x improvement in intensity and frequency stability
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31Quadruple Suspensions
• Quadruple pendulum:
• ~107 attenuation @10 Hz
• Controls applied to upper layers; noise filtered from test masses
• Seismic isolation and suspension together:
• 10-19 m/rtHz at 10 Hz
Fused silica fiber Welded to ‘ears’, hydroxy-catalysis bonded to optic
Magnet Actuator
Electrostatic Actuator
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Courtesy: Stan Whitcomb 32
Advanced LIGO Mirrors• Larger size
– 11 kg -> 40 kg• Smaller figure error
– 0.7 nm -> 0.35 nm• Lower absorption
– 2 ppm -> 0.5 ppm• Lower coating thermal noise
• All substrates delivered• Polishing underway• Reflective Coating process starting up
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Caltech LIGO Laboratory MIT
LIGO Hanford Observatory LIGO Livingston Observatory
University of Adelaide ACIGA
Australian National University ACIGA
Balearic Islands University (Mallorca !)Caltech LIGO
Caltech Experimental Gravitation CEGG
Caltech Theory CART
University of Cardiff GEO
Carleton College
Cornell University
Embry-Riddle Aeronautical University
University of Florida-Gainesville
Glasgow University GEO
NASA-Goddard Spaceflight Center
Hobart – Williams University
India-IUCAA
IAP Nizhny Novgorod
Iowa State University
INDIGO, India
Loyola New Orleans
Louisiana State University
Louisiana Tech University
MIT LIGO
Max Planck (Hannover) GEO
Max Planck (Potsdam) GEO
University of Michigan
Moscow State University
NAOJ - TAMA
Northwestern University
University of Oregon
Pennsylvania State University
Southeastern Louisiana University
Southern University
Stanford University
Syracuse University
University of Texas-Brownsville
Washington State University-Pullman
University of Western Australia ACIGA
University of Wisconsin-Milwaukee
LIGO Scientific Collaboration~40 institutions, ~550 scientists
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Unilumen Photonics Pvt Ltd• Incubated by IIT Madras• Registered in 2012
• High power fibre lasers• Optoelectronics design
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• 8 faculty in EE, 40 post-grad students• Another 6 in Physics, Engineering Design, Applied
Mechanical
• Growing visibility in international community• Larger role in developing Photonics in India• Need to form collaborations and teams• New opportunities in biophotonics, silicon photonics,
telecommunications, defense
• Organizers for Photonics 2012, in December.
Photonics @ IIT Madras