| dc.description.abstract | In this thesis, the photonic crystal double coupled cavities’ modes are tuned by water infiltrated. The coupling strength between two cavities can be obtained by analyzing the splitting between MS and MA modes, and the FWHM of these two modes from micro-PL spectrum.
There are two water infiltrated ways, one is airgap infiltration (water infiltrated below the slab), and another one is airhole infiltration (water infiltrated into local airholes). Airgap infiltration will induce the same influence to both cavities. In this experiment, we can find the evanescent wave can extend over 0.20μm. As the water in airgap decreasing, the variation of coupling strength is 0.20meV, and the quality factor upraise to 1.4 – 2 times.
Airhole infiltration will induce the different influence to each cavity. The purpose of airhole infiltration is trying to tune one cavity to be identical with the other one. When these two cavities are identical, the minimum of two modes splitting and the crossing of two modes FWHM should be observed. Finally, we observe those phenomena, and we can compute the coupling strength of double coupled cavities is 9.19meV. | en_US |