A signature experiment highlighting the wave-particle duality, uncertainty, delayed-choice and quantum computing is developed at the Physlab. It will introduce students to the concepts using classical light from a laser. For more details visit the experiment website here.
Optical tunneling is demonstrated by frustrated total internal reflection.
- A green laser diode (from a laser pointer) falls on a glass prism. The angle of incidence is greater than a critical angle, resulting in light being totally internal reflection.
- There is evanescent light leaking from the prism. But this light is difficult to tap off, unless a second prism is placed really close to the first one.
the second prism is almost conjoined with the first prism using an index matching fluid (Cargille’s BK 7 Matching Liquid).
- The fluid is able to mate the prisms really well, yet it keeps a small gap between the prisms. Light can tunnel across this classically forbidden region and transmit into the second prism. Total internal reflection has been frustrated.