摘要(英) |
In this thesis, we investigate the coupling behavior of photonic crystal coupled L3 cavities through micro-photoluminescence (μ-PL) spectroscopy. By spatial separation tuning, we found that the mode splitting is proportional to the cavity coupling strength, and both of them decrease with the increasing distance between the two cavities. By air-holes-shift tuning, the movement of air holes results in size detune of the two cavities and decreases the coupling strength. By substrate heating tuning, the rising temperature causes the resonant wavelength red shift, but the change of refractive index of substrate does not influence the coupling strength significantly. By laser local heating tuning, the refractive index detune of the two cavities increases the mode splitting and decreases the cavity coupling strength. While the laser power exceeds 11mW, we observe spectral bifurcation phenomenon which results from the thermal vibration on photonic crystal membrane.
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