1. Total Internal Reflection1

2. Optical Analog to Tunneling: Frustrated Total Internal Reflection
Pick up so-called “evanescent waves” which is exponentially decaying, non-propagating electromagnetic field, analogous to wave function in forbidden region. 2

3. Frustrated Total Internal Reflection
Familiar Example of
Frustrated Total Internal Reflection
Without fingers present, no light from outside of glass would get through because of internal reflection, fingers distort evanescent field, causing propagating light to occur (like measuring particle in classically forbidden region) 3

4. Application I: Touch Screen for
Cell Phone or Tablet
Pick up so-called “evanescent waves” which is exponentially decaying, non-propagating electromagnetic field, analogous to wave function in forbidden region. 4

5. Application I: Multifinger Touch Screens
Pick up so-called “evanescent waves” which is exponentially decaying, non-propagating electromagnetic field, analogous to wave function in forbidden region. 5

6. Fingerprint Biometric Security
Application II:
Fingerprint Biometric Security 6