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Thin Film Interference

Thin Film Interference. Soap Film – Why Color?. iridescence. Reflection and Phase. t. Thin Film Interference. Some light reflects off top layer, some off bottom layer. If crest meets trough  destructive interference. If crest meets crest (trough meets

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Thin Film Interference

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  1. Thin Film Interference

  2. Soap Film – Why Color? iridescence.

  3. Reflection and Phase

  4. t

  5. Thin Film Interference Some light reflects off top layer, some off bottom layer. If crest meets trough  destructive interference If crest meets crest (trough meets trough)  constructive interference

  6. If remove (by destructive interference) a color from white light, will see the complementary color. ex., if yellow light is cancelled, will see blue

  7. What determines the color seen? Thin Film Film material (n) and thickness (t) Angle viewed at

  8. (assume light strikes perpendicular) extra distance (ABC) = 2t phase shift 2t t

  9. phase shift 2t

  10. λ is the wavelength in the film λair λn = --- n

  11. A soap bubble (n = 1.35) appears green (λ = 540 nm) at the point on its front surface nearest the viewer. What is its minimum thickness? 1.0 x 107 m

  12. Iridescent Paint

  13. Stealth Bomber Eliminate radar through thin-film interference

  14. Anti-Reflective Coating

  15. Coated lens reduces reflections through thin-film interference.

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