Optical modes in InGaAs/GaAs quantum dot microtube ring resonators at room temperature

Enhanced axial confinement in a monolithically integrated self-rolled-up SiNx vertical microring photonic coupler

“…Axial confinement in self-rolled-up microtubes had been studied both theoretically and experimentally by a couple of research groups. [14][15][16][17] In all these previous cases, the axial confinement was introduced by a specially designed geometrical shape of a section of the microtube. After being rolled up, the microtube wall will have different thicknesses at different axial locations.…”

Monolithically integrated self-rolled-up microtube-based vertical coupler for three-dimensional photonic integration

“…[7][8][9][10] The tube waveguide has been demonstrated both theoretically and experimentally to support whispering gallery modes (WGM) circulating along its circumference. 6,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] The light can be evanescently coupled between the tube and a straight waveguide once their separation is made adequately small, typically within a fraction of the wavelength of the propagating light. Several research groups have already demonstrated 3D photonic integration using the tube waveguide.…”

Self-rolled-up microtube ring resonators: a review of geometrical and resonant properties

“…The Q factor could be improved by incorporating surface features such as periodic corrugation such in the case of Ref. [46]. However, for sensing large changes of refractive index, the high sensitivity of the rolled-up microcavities provides a cheap and simple way to produce large spectral shifts for detection.…”