Abstract
The mode frequency and the quality factor of nanowire cavities are calculated from the intensity spectrum obtained by the finite-difference time-domain (FDTD) technique and the Padé approximation. In the free-standing nanowire cavity with the dielectric constant 6.0 and the length of 5 μm, the quality factors of 130, 159, and 151 are obtained for HE11 with frequency around 798 THz, at the cavity radius of 60nm, 75nm, and 90nm, respectively. The Q-factor of 78 is also calculated in the nanowire with length of 5 μm and radius of 60nm grown on the sapphire substrate with refractive index 1.8. The obtained mode field distribution of the fundamental transverse mode shows that the mode field confined very well by the nanowire cavity even when the radius of nanowire is much smaller than the mode wavelength.
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