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Thin Film Optics

Thin Film Optics. Physics of thin film optics Important spectral features BaCuSF data. Optics basics. k wave vector. n = index of refraction a = absorption coefficient k = extinction coefficient e = dielectric constant. Real sample with surfaces. Bulk sample. Absorption. d.

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Thin Film Optics

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  1. Thin Film Optics • Physics of thin film optics • Important spectral features • BaCuSF data

  2. Optics basics k wave vector n = index of refraction a = absorption coefficient k = extinction coefficient e = dielectric constant

  3. Real sample with surfaces Bulk sample Absorption d

  4. Thin Film on substrate r1 t1 r2 n1=n d t2 n2=s r3 t3 • polarization • angle

  5. Surface reflection and transmission

  6. R & T for real sample(no fringes) surface coeffs surface coeffs multiple bounces multiple bounces

  7. R & T for real sample(w/ fringes)

  8. Deduce Abs Coeff from R & T Transmission normalized to what it “should” have been

  9. Thin Film Interference Fringesn=2.5,s=1.5, d=0.4µm m=2 m=1 Transmission Reflection

  10. Thin Film Interference Fringesn=2.5, s=1.5, d=1µm m=7 m=6

  11. Dispersion tightens up fringesn=2.6+, s=1.51, d=1µm

  12. Absorption cuts transmissionn=2.6+, s=1.51, d=1µm, absorption (blue)

  13. Index, absorption model (amorph Si)

  14. Fringes vs angle

  15. Effect of ignoring last surfacen=2.6+, s=1.51, d=1µm, absorption (blue)red=no substrate, black = w/ substrate

  16. Analysis to find absorptionn =2.6+, s=1.51, d=1µmblue=abs, red = R+T, black=T/(1-R)

  17. Determine absn dispersive, s=1.51, d=1µmblue=abs, black = T/(1-R), red=expt abs

  18. Average transmission fringesn dispersive, s=1.51, d=1µm

  19. Average reflection fringesn dispersive, s=1.51, d=1µm

  20. Grating Spectrometer

  21. BaCuSF Transmission

  22. BaCuSF Gap analysis

  23. BaCuSF Gap analysis

  24. BaCuSF R, T Spectra

  25. BaCuSF Index

  26. BaCuSF Reflection (th vs expt)

  27. BaCuSF Transmission (th vs expt)

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