The whispering gallery mode (WGM) optical microresonators formed on the optical fiber surface appear as a promising ultraprecise and ultralow loss technological platform (known as Surface Nanoscale Axial Photonics, SNAP) to create miniature optical devices including delay lines, signal processors, photonic sensors, optical frequency comb generators, etc. It is important to note that applications involving high intracavity power may face intense cavity heating and hence unwanted radius changes. Here we the heating effects in SNAP cavities both experimentally and numerically and reveal the changes in the mode structure induced by the heating due to whispering gallery mode energy dissipation.
In this work we present a novel technique to fabricate whispering gallery modes microresonators on the regular optical fiber surface. We use a high-resistance wire heated by constant electrical current up to temperatures of 1100 °C. Due to higher temperature stability, high reproducibility of the microcavities shaping is ensured. Our method makes it possible to reduce the cost and simplify the production of WGM microresonators on the optical fiber surface.
We propose a new mechanism for fully optical tuning and self-stabilization of microresonators based on optical fibers. We suggest using a fiber with core doped with rare earth active ions. Launching light into the core would result in heating and tuning the microcavity. We also show that utilizing a single laser for both pumping the micro-resonator and heating up the fibre creates a feedback for self-stabilization of the microcavity.
We investigate an impact of a small particle located on the surface of a fiber resonator on the dynamics of the whispering gallery modes (WGM) circulating near the fiber surface. We consider a single molecule of fibrinogen and bovine serum albumin that is put in contact with the surface of the fiber. We have studied both temporal dynamics of optical pulses propagating at the WGM as well as changes in the spectrum of WGM due to impact of the particle.
We show that such modes can be reflected from the optical fiber facet. Due to reflection, a locking effect occurs near the optical fiber facet for the whispering gallery modes with an axial component of the wave vector. Effective locking occurs due to the destructive interference of the waves coming from the excitation source and the waves reflected from the fiber facet. We obtained an analytical expression for determining the resonant wavelengths. We also experimentally characterized the reflectance of the fiber edge by studying dynamics of an optical pulse propagating towards the edge and reflecting from it.
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