NARROW SPECTRAL BANDWIDTHS WITH GRATING WAVE-GUIDE STRUCTURES

Under certain conditions grating/waveguide structures have a resonant behavior with narrow spectral bandwidths. Several such structures were designed, fabricated? and evaluated, demonstrating resonances with na rrow spectral bandwidths ranging to as low as 0.035 nm at full width a t half maximum. These can be exploited as compact spectral filters hav ing high finesse. (C) 1996 American Institute of Physics.