Manufacture of 3-D Microfiber Coil Resonators

Abstract

3D microfiber coil resonators are experimentally demonstrated. Three-turn and four-turn microcoil resonators are fabricated by wrapping a microfiber on a low refractive index rod. The extinction ratio and free spectrum range are ~10dB and ~1nm respectively.

Optical microfibers and nanofibers

“…Using the coupled wave equations, the analytical transmission properties of multicoil resonators can be predicted [138,[140][141][142]. In 2007, Xu et al demonstrated a multicoil resonator by wrapping a 1.5-μm-diameter MNF on a low refractive index rod with diameter of ~560 μm in 2~4 turns [143]. As-fabricated resonator exhibits a transmission spectrum with an extinction ratio of 10 dB and a FSR of 1 nm.…”

Analytical Computation of the Electromagnetic Field Produced by an Optical Fiber Helix

“…Structures of coiled optical fibers, especially of sub-wavelength diameter, are currently attracting interest as sensitive optical microresonators [5,6]. The evanescent field of these ultrathin optical wires is greatly enhanced, causing the periodic interaction between the helix turns and consequently a resonant transmission spectrum.…”

Optical fibre nanowire technology and applications

“…This allows the fabrication of atom guides [9], sensors [10][11][12][13][14][15], high-Q resonators [7,[16][17][18][19][20][21] and particle handling [22]. 2) High nonlinearity: Light can be confined to a very small area over long device lengths allowing the ready observation of nonlinear interactions [23], such as supercontinuum generation [4], at relatively modest power levels.…”

“…Bend radii of the order of a few microns can be readily achieved with relatively low induced bend loss [2, 24] allowing for highly compact devices with complex geometry e.g. 3D multi-ring resonators [16][17][18][19][20]. 4) Low-loss interconnection to other optical fibres and fiberised components: OFNs are fabricated by adiabatically stretching optical fibres and thus preserve the original dimensions of the optical fibre at their input and output allowing ready splicing to standard fibres.…”