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(Color online) (a) Main resonance mode, WGM, with azumithal number 6 (W6 mode) is calculated by 2D FDTD method. Other resonance modes (W3, W4, and W5) near the W6 mode in spectrum are also calculated. (b) Top view and tilted view SEM pictures of a typical DQPC D2 microcavity. The fabricated lattice constant and airhole radius are 600 and .
(Color online) (a) Typical L-L curves of DQPC and triangular PC D2 microcavity lasers. The thresholds of DQPC and PC D2 lasers can be estimated as 0.15 and at similar lasing wavelengths. (b) Typical lasing spectrum of DQPC D2 microcavity laser. The lasing wavelength is and its FWHM is .
(Color online) (a) Illustration of two variation regions, the 12 nearest airholes (denoted by red circles, region A) and the outer airholes (denoted by blue circles, region B) in DQPC D2 microcavity. The mode distortions of these two cases with the same variation degree of 5% are also shown. (b) Lasing spectra of devices with different variation degrees in regions A and B. Lasing wavelength variations for the region-A and -B cases are 19 and .
(Color online) WGM in triangular PC D2 microcavity shows the mismatch between the mode profile and the cavity boundary. Well-confined WGM is sustained in modified PC D2 microcavity by shifting six nearest airholes outward to form a circular cavity boundary.
Observed lasing actions of DQPC D2 microcavity lasers with different variation regions and degrees. The sampling devices are over 300.
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