Question 4: Total Internal Refraction and Evanescent Wave You are given a light guide structure with two cladding layers shown below. If you have a light beam (TE wave, wavelength 532 nm, 1 mW) illuminates into the light guide at an angle q, please answer the following questions. (1) What is the maximum angle allowed to ensure light gets total internal reflection at the interface between the core and the cladding layer. (2) If a light beam enters the waveguide at a=30 degrees, what is the penetration depth into the cladding layer? (Penetration depth is defined as intensity decays to 1/e of the intensity at the interface) Cladding n,=1.3 Air Core n;=1.5