DISTANCE (wavelengths) Fig. 4. Propagation of the vector potential from vacuum into a linear medium with a step- yer on th region is the profile of the index of refraction. The field travels to the right and the horizontal tis is scaled to the wavelength. DISTANCE (wavelengths) Fig. 5. Same as Fig 4 after the field has propagated out of the medium through the anti- reflection layer. #77863·S1500USD Received 18 December 2006, accepted 7 January 2007 (C)2007OSA 22 January 2007/ Vol 15, No. 2/OPTICS EXPRESS 722-70 -50 -30 -10 10 30 50 70 DISTANCE (wavelengths) 0.0 0.2 0.4 0.6 0.8 1.0 AMPLITUDE (arb. units) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 REFRACTIVE INDEX (no units) Fig. 4. Propagation of the vector potential from vacuum into a linear medium with a step￾index for the entry and a gradient-index antireflection layer on the exit face. The shaded region is the profile of the index of refraction. The field travels to the right and the horizontal axis is scaled to the wavelength. -70 -50 -30 -10 10 30 50 70 DISTANCE (wavelengths) 0.0 0.2 0.4 0.6 0.8 1.0 AMPLITUDE (arb. units) 1.0 1.1 1.2 1.3 1.4 1.5 1.6 REFRACTIVE INDEX (no units) Fig. 5. Same as Fig. 4 after the field has propagated out of the medium through the anti￾reflection layer. #77863 - $15.00 USD Received 18 December 2006; accepted 7 January 2007 (C) 2007 OSA 22 January 2007 / Vol. 15, No. 2 / OPTICS EXPRESS 722