Near-field effect involving photonic bands

The relationship between the excitation of photonic bands and the enhancement of local-field intensity is discussed. Using the time reversal symmetry, it is shown that the local held induced by a plane-wave light at a point near the arrayed dielectrics is essentially the same as the optical signal of a light emitted from that point and detected by a remote recorder. For a periodic monolayer of dielectric spheres, a variety of the frequency-and position-dependences of the local field are presented numerically and their origins are discussed in relation to the optical near-field microscopy (SNOM) signals. (C) 1997 Elsevier Science S.A.