Direct Measurement of the Guided Modes in LiNbO3 Waveguides
01 January 2002
Mode profiles of the light coming out of Ti diffused waveguides formed in LiNbO3 crystals was imaged using a near field optical microscope (NSOM). We find that the transverse magnetic mode has a smaller spatial dimension and is closer to the surface of the waveguide than the transverse electric mode. By incorporating the NSOM in an interferometer, we measure directly the phase and intensity distribution of the guided optical modes.