Optical Microcavities Formed by Semiconductor Microtubes Using a Bottlelike Geometry

Abstract

We report on the realization of optical microtube resonators with a bottlelike geometry. The measured eigenenergies and the measured axial field distributions of the modes can be described by a straight and intuitive model using an adiabatic separation of the circulating and the axial propagation. The dispersion of the axial mode energies follows a photonic quasi-Schrödinger equation including a quasipotential which can be determined for the actual geometry of the microtube in a precise and simple way. We show that tailoring the geometry of the microtube bottle resonators enables the realization of a wide variety of mode distributions and dispersion relations.

Localized Surface Plasmons Selectively Coupled to Resonant Light in Tubular Microcavities

“…This type of microcavity supports WGM resonances due to self-interference of light propagating along a circular ring trajectory defined by the tube cross section. In addition to the WGMs, the resonant light simultaneously oscillates along the tube axis resulting in the occurrence of well-established axial resonant modes [24][25][26]. The gold-nanogaps were fabricated on microtubular cavities by depositing a thin gold layer on top of the lobepatterned spirally rolled-up nanomembranes.…”

“…A scanning electron microscopy (SEM) image of a rolled-up microtube is shown in Fig. 1a [24,27]. Figure 1c shows the optical field distribution in the lobe region for the first four orders of axial modes (i.e.…”

“…In brief, the mode distribution along the axial direction is determined by the lobe structure as described by a quasi-Schrödinger equation [24,25]:…”

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

“…The resulting axial field dispersion also implies that the wavevector of each confined photon is not only determined by the azimuthal mode number (m) but also directly related to an additional axial mode number ( p) (inset of Fig. 2b), thereby leading to different eigenenergies [7]. We have derived a minimum intrinsic linewidth of 0.5 meV at room temperature, which corresponds to a maximum Q-factor of 2000.…”

Vertical integration of self-rolled-up microtube and silicon waveguides: a two-channel optical add–drop multiplexer

“…A self-rolled-up microtube (SRM), as a novel microresonator, was introduced in the middle 2000s [7,8] . The rolling mechanism for the fabrication of the tubular shape of this structure facilitates the achievement of 3D light confinement in azimuthal, radial, and axial directions [9,10] . Furthermore, several experimental reports on the vertical coupling of this structure and other waveguides, both manually and monolithically, have been presented [11,12] .…”