Nonlinear conversion processes in one-dimensional photonic band gap structures: blue and green light emission

Summary form only given. One of the most interesting aspects related to the /spl chi/(2) response of photonic band gap (PBG) crystals is the possibility of greatly enhancing the conversion efficiency of nonlinear processes. The enhancement of second harmonic generation (SHG) is perhaps the best example that we could cite, although in general our discussion is valid for initial-wave mixing processor. The processes that we discuss owe their increased efficiency to the simultaneous availability of (1) exact phase matching conditions, and (2) high localization of the fields with frequencies tuned at transmission resonances near the photonic band edge.