Study of Fiber Taper Diameter Characterization Using Forward Brillouin Scattering (CAT#: STEM-ST-0122-YJL)

Name: Study of Fiber Taper Diameter Characterization Using Forward Brillouin Scattering
SKU: STEM-ST-0122-YJL
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Introduction

Light confinement in fiber tapers, especially in the subwavelength regime, enables a variety of applications in nonlinear optics, supercontinuum generation, Brillouin scattering, and quantum optics. Additionally, these micro-wires can be used to couple light into and out of photonic circuits and special fibers. In many of these applications, fine control of the micro-wire diameter is critical. Similarly, quantum optics experiments rely on strict control of the evanescent field in order to trap atoms/particles. Controlling the propagation properties, such as the effective index and the depth of the evanescent field, becomes even more difficult for wires with sub-micron diameter, as these parameters change quite rapidly. It is therefore of great importance to precisely characterize the diameter of the wire as well as its uniformity along its length.

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Principle Applications Procedure Materials

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.