Relative phase tuning of coupled defects in photonic crystal vertical-cavity surface-emitting lasers
Evanescent coupling can be achieved by patterning the top facet of a vertical-cavity surface-emitting laser (VCSEL) with a multiple defect photonic crystal pattern. We show that for 2×1 coupled defect arrays, the phase between these emission sites changes as the current is varied. The phase variation is manifest in the far field pattern and may be determined using antenna array theory. It is found that the phase varies 81 deg between transversely coupled cavities as the current to the VCSEL is varied by 24 mA. This corresponds to a far field angular change of approximately 1.5 deg.
Surface collisions, Acoustic transducers, Units of measurement, Antennas, Signal processing, Optical properties, Lasers, Photonic crystals, Oxides, Phase variation
Ann C. Lehman, James J. Raftery, Aaron J. Danner, Paul O. Leisher, Kent D. Choquette; Relative phase tuning of coupled defects in photonic crystal vertical-cavity surface-emitting lasers. Appl. Phys. Lett. 9 January 2006; 88 (2): 021102. https://doi.org/10.1063/1.2164347