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INTERNSHIP PRESENTATION

INTERNSHIP PRESENTATION. DEBASMIT DAS ENROLLMENT NO. – 10115039 BATCH E3. DETAILS ABOUT MY INTERNSHIP. TYPE – RESEARCH INTERNSHIP PLACE – ECOLE POLYTECHNIQUE DE MONTREAL FIELD – PHOTONICS GUIDE – DR. RAMAN KASHYAP LAB- ADVANCED PHOTONICS CONCEPTS LABORATORY

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INTERNSHIP PRESENTATION

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  1. INTERNSHIP PRESENTATION DEBASMIT DAS ENROLLMENT NO. – 10115039 BATCH E3

  2. DETAILS ABOUT MY INTERNSHIP • TYPE – RESEARCH INTERNSHIP • PLACE – ECOLE POLYTECHNIQUE DE MONTREAL • FIELD – PHOTONICS • GUIDE – DR. RAMAN KASHYAP • LAB- ADVANCED PHOTONICS CONCEPTS LABORATORY • DURATION – 13TH MAY TO 19TH JULY, 2013

  3. CONTENTS OF MY INTERNSHIP • FABRICATION OF A 4-PORT OPTICAL FIBER COUPLER • EXPERIMENTAL AND THEORITICAL ANALYSIS OF SURFACE PLASMON DEVICES (SPR) BASED ON OPTICAL FIBER

  4. FABRICATION OF A 4-PORT OPTICAL FIBER COUPLER • AIM OF THIS PROJECT IS TO BUILD A COUPLER THAT CAN BE USED MULTIPURPOSELY FOR DIFFERENT PROJECTS IN THE FUTURE. • I APPLIED THE COUPLER TO OBTAIN THE REFLECTION AND TRANSMISSION SPECTRUM OF A TILTED FIBER BRAGG GRATING. • DETAILS ON THESE IN THE COMING SLIDES……

  5. FIBER OPTIC COUPLER Coupler used to direct light into the Fiber Bragg Grating. LC=Coupling Length ; LW = Waist Length ; LT = Taper length

  6. P1-3 (Power in wave guide 1 to 3) = cos2(kz) P2-4(Power in wave guide 2 to 4) = sin2(kz) Plot of power P1-3 (red) P2-4 (green) with distance along coupling length

  7. FBG and tilted FBG • Resonance condition for FBG λB= 2nt For tilted FBG the condition holds as λB= 2nt cos (x) where x is the angle of tilt But why is the tilted FBG? Because my fiber is DCF (double clad fiber)

  8. Schematic of the Coupler I am to produce

  9. Steps • Etching of two DCF fibers around 15 cm length • Twisting of the two fibers along the etched portion. • Fixing the coupler to a platform to make it ready for measurements • Characterization of the coupler and observing the spectrum of the tilted FBG

  10. DCF before being etched DCF after being etched

  11. Characterization • Excessive Loss = -10 log(P1+P2/Pin) • CR = P2/P1+P2 x 100 % (Coupling Ratio) • For 6 Twists – Pin= 12.35dBm P1=10.45 dBm P2=-32.45 dBm So excessive Loss = 1.5497 dB CR=0.005688 %

  12. Reflection and Transmission Spectrum

  13. SURFACE PLASMON RESONANCE • AIM OF THIS PROJECT IS SIMULATION AND ANALYSIS OF SPR ON A NOVEL H-SHAPED FIBER • SIMULATION HAS BEEN DONE IN MATLAB • PURPOSE OF SIMULATION IS TO ANALYSE AND COMPARE WITH EXPERIMENTAL RESULTS

  14. PHENOMENON OF SPR k*ng *sinθ = k((ns2*εm)/( ns2 + εm))^0.5 MOMENTUM TRANSFER CONDITION

  15. APPLICATION • As a biosensor or a chemical sensor • As refractive index of sensing medium changes so will the resonance wavelength • So the resonance wavelength can plotted with refractive index and this calibration is used to create biosensor • It can indirectly be used to measure concentration of analyte which perturbs refractive index • ADVANTAGE : Very high sensitve sensors ~ 3000 nm/RIU . Apt for the nano world.

  16. The Special H-shaped fiber

  17. Why H-shaped Fiber? • Birefringent fiber with elliptical core • Two orthogonal single modes with no interference in visible region. • Can be used to measure two quantities simultaneously • But for now analysis is done for one axis that is the axis along the cleavage….

  18. N-Layer Model Parameters • N=3 for our cases • n1=core n2=metal n3=dielectric sensing medium • Core diameter =10 nm Metal thickness (gold) =50 nm and Dielectric thickness = 25 nm

  19. THANK YOU !! SPECIAL THANKS TO MITACS FOR FUNDING THE INTERNSHIP

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