Design of ultrahigh quality factor photonic crystal nanocylinder cavities
We propose and theoretically investigate a novel one dimensional photonic crystal nanocylinder cavity (PCNC) that can support the second order transverse electric like (TE2 mode. Three dimensional finite difference time domain simulations show that the TE2 mode of the PCNC possesses an ultrahigh quality factor of 1.22 x 108 and a small mode volume of when the PCNC is made of high index material of silicon. For the PCNCs which are made of low index materials, the corresponding quality factors of TE2 modes reach the highest values relative to previously demonstrated PhC nanobeam cavities with the same low index materials to the best of our knowledge. We believe the PCNC will be a highly promising candidate for low threshold high speed nanoscale lasers and cavity optomechanics.