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Square microcavity laser with an output wavegnide is proposed and analyzed by the finite-difference time-domain(FDTD)technique.For a square resonator with refractive index of 3.2,side length of 4μm,and output wavegnide of 0.4-μm width,we have got the quality factors(Q factors)of 6.7×10~2 and 7.3×10~3 for the fundamental and first-order transverse magnetic(TM)mode near the wavelength of 1.5μm,respectively.The simulated intensity distribution for the first-order TM mode shows that the coupling efficiency in the waveguide reaches 53%.The numerical simulation shows that the first-order transverse modes have fairly high Q factor and high coupling efficiency to the output waveguide.Therefore the square resonator with an output wavegnide is a promising candidate to realize single-mode directional emission microcavity lasers.
Square microcavity laser with an output wavegnide is proposed and analyzed by the finite-difference time-domain (FDTD) technique. For a square resonator with refractive index of 3.2, side length of 4μm, and output wavegnide of 0.4-μm width, we have (Q factors) of 6.7 × 10 -2 and 7.3 × 10 -3 for the fundamental and first-order transverse magnetic (TM) mode near the wavelength of 1.5 μm, respectively. The simulated intensity distribution for the first- order TM mode shows that the coupling efficiency in the waveguide reaches 53%. The numerical simulation shows that the first-order transverse modes have the fairly high Q factor and high coupling efficiency to the output waveguide. Herefore the square resonator with an output wavegnide is a promising candidate to realize single-mode directional light emission microcavity lasers.