Phys 200B – HW14/15

Due Tuesday 08-Mar-05 10:00AM to Norm Paris

15-1. Consider an s-polarized wave that is totally internally reflected from the interface (in the x-y plane) between two dielectric media. Determine the energy flow in the evanescent wave parallel to the interface. Consider the wave (wave length l) to be incident on the boundary with q_i, the media to have m_i, e_i and m_t, e_t. What is the energy flow when the incident wave is p-polarized?

15-2. Light of wavelength l in vacuum is incident normal to substrate on which there is a coating of thickness d. If the indices of the incident medium, the coating, and the substrate are n_i, n_c, and n_s (all real), determine R (the reflection coefficient). Solar cells made from Si have an SiO anti-reflection coating to increase their efficiency. What is the reflectance from uncoated Si, and what is the minimum reflectance from coated Si?

15-3. Problem 7.22 in Jackson