1. M.-K. Lee, C.-H. Chu, Y.-H. Wang, Opt. Lett. 26, 3 (2001).
2. J.E. Carey, C.H. Crouch, M. Shen, E. Mazur, Opt. Lett. 30, 14 (2005).
3. J.M. Martinez-Duart, R.J. Martin-Palma, Phys. Stat. Sol. 232(1), 81 (2002).
4. S.M. Vernon, N.M. Kalkhoran, H.P. Maruska, W.D. Halverson, First IEEE–WCPEC, 1583 (1994).
5. A. Halimaoui, in Properties of Porous Silicon, ed. by L.T. Canham (INSPEC, London, 1997), p. 12 and p. 167.