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Optical Antennas for Raman Spectroscopy

Optical Antennas for Raman Spectroscopy. Laura Matloff Mentor: Matteo Staffaroni (EECS) Faculty Sponsor: Prof. Yablonovitch. At Airports. Compact desktop explosives/narcotics detection system. Security Guy. Sample collection swab. Your check-in luggage. nose. Raman Spectroscopy.

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Optical Antennas for Raman Spectroscopy

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  1. Optical Antennas for Raman Spectroscopy Laura Matloff Mentor: Matteo Staffaroni (EECS) Faculty Sponsor: Prof. Yablonovitch

  2. At Airports Compact desktop explosives/narcotics detection system Security Guy Sample collection swab Your check-in luggage

  3. nose

  4. Raman Spectroscopy Pump Photon Virtual Level Pump Photon Excited State Ground State Target Molecule in Ground State

  5. Raman Spectroscopy Pump Photon Virtual Level Stokes-shifted Photon Stokes-shifted Photon Pump Photon Excited State Ground State Target Molecule in Excited State

  6. The likelihood of a Raman scattering event depends on the intensity of the light in the neighborhood of the molecule Pump Photons Photon Counts 554 504 514 524 524 534 544 Wavelength (nm)

  7. For single molecule detection (E-Field enhancement)4 > 1014 Pump Photons Photon Counts Stokes-shifted Photons 554 504 514 524 524 534 544 Wavelength (nm)

  8. The Dipole Antenna

  9. Antenna Arm Length (µm)

  10. Antenna Arm Length (µm)

  11. Antenna Arm Length (µm)

  12. Antenna Arm Length (µm)

  13. Antenna Arm Length (µm)

  14. Antenna Arm Length (µm)

  15. Antenna Arm Length (µm)

  16. Antenna Arm Length (µm)

  17. Antenna Arm Length (µm)

  18. Antenna Arm Length (µm)

  19. Antenna Arm Length (µm)

  20. Antenna Arm Length (µm)

  21. Antenna Arm Length (µm)

  22. Antenna Arm Length (µm)

  23. Antenna Arm Length (µm)

  24. Antenna Arm Length (µm)

  25. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Antenna Antenna Arm Length (µm)

  26. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Antenna

  27. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Antenna

  28. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Antenna

  29. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Grating Coupler Optical Antenna

  30. Grating Coupler

  31. COMSOL Model Without Grating With Grating

  32. Transformer - + - +

  33. 3D Taper (Optical Transformer) Au

  34. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Transformer Grating Coupler Optical Antenna

  35. 2D Taper Au

  36. The Side View

  37. The Side View Au Initial Thickness Taper Angle Final Thickness Au

  38. Optimizing Taper Angle Power Throughput (%) Taper Angle (Degrees) Where Initial Thickness = 50nm and Final Thickness = 5nm

  39. Transformer Action in 2D Vout / Vin 100 nm Air 50 nm 10 1 Final Plate Spacing (nm)

  40. Transformer Action in 2D Vout / Vin 100 nm Air 50 nm 10 1 Final Plate Spacing (nm)

  41. E-Field Enhancement in 2D Eout / Ein

  42. Transformer Action in 3D Vout / Vin

  43. E-Field Enhancement in 3D Eout / Ein

  44. Single molecule detection requires electric field enhancement of 1014 1016 1014 1012 1010 108 106 104 102 1 Optical Transformer Grating Coupler Optical Antenna

  45. Citations Pictures: http://unitedlp.com/images/power_Lines.jpg www.jamd.com/image/g/1714820 http://www.macsparky.com/wp-content/uploads/2008/01/crowd.jpg

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