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Orientation-dependent bending properties of selectively-filled photonic crystal fibres

Orientation-dependent bending properties of selectively-filled photonic crystal fibres
Orientation-dependent bending properties of selectively-filled photonic crystal fibres
A selective-filling technique was demonstrated to improve the optical properties of photonic crystal fibres (PCFs). Such a technique can be used to fill one or more fluid samples selectively into desired air holes. The technique is based on drilling a hole or carving a groove on the surface of a PCF to expose selected air holes to atmosphere by the use of a micromachining system comprising of a femtosecond infrared laser and a microscope. The exposed section was immersed into a fluid and the air holes are then filled through the well-known capillarity action [1, 2]. Provided two or more grooves are fabricated on different locations and different orientation along the fibre surface, different fluids may be filled into different air-holes to form a hybrid fibre. As an example, we filled half of a pure-silica PCF by a fluid with n=1.480 by carving a rectangular groove on the fibre (Figure 1). Consequently, the half-filled PCF became a bandgap-guiding structure (upper half), resulted from a higher refractive index in the fluid rods than in the fibre core [3], and three bandgaps were observed within the wavelength range from 600 to 1700 nm. Whereas, the lower half (unfilled holes) of the fibre remains an air/silica index-guiding structure (Figure 1(b)). When the hybrid PCF is bent, its bandgaps gradually narrowed, resulted from the shifts of the bandgap edges. The bandgap edges had distinct bend-sensitivities when the hybrid PCF was bent toward different directions. Especially, the bandgaps are hardly affected when the half-filled PCF was bent toward the fluid-filled region. Such unique bend properties could be used to monitor simultaneously the bend directions and the curvature of the engineering structures.
Wang, Yiping
3da133a6-980c-4622-9c63-4e691fc0cae1
Jin, Wei
ced7b68f-0cb0-4c24-9ccf-194e6c629256
Tan, Xiaoling
b2d5441c-af05-4cec-b189-2709d2e8ee5d
Liu, Shujing
3d8de1e5-783f-4856-9710-fbdaf088f2d3
Wang, Yiping
3da133a6-980c-4622-9c63-4e691fc0cae1
Jin, Wei
ced7b68f-0cb0-4c24-9ccf-194e6c629256
Tan, Xiaoling
b2d5441c-af05-4cec-b189-2709d2e8ee5d
Liu, Shujing
3d8de1e5-783f-4856-9710-fbdaf088f2d3

Wang, Yiping, Jin, Wei, Tan, Xiaoling and Liu, Shujing (2010) Orientation-dependent bending properties of selectively-filled photonic crystal fibres. Photon 10, United Kingdom. 22 - 25 Aug 2010. 1 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

A selective-filling technique was demonstrated to improve the optical properties of photonic crystal fibres (PCFs). Such a technique can be used to fill one or more fluid samples selectively into desired air holes. The technique is based on drilling a hole or carving a groove on the surface of a PCF to expose selected air holes to atmosphere by the use of a micromachining system comprising of a femtosecond infrared laser and a microscope. The exposed section was immersed into a fluid and the air holes are then filled through the well-known capillarity action [1, 2]. Provided two or more grooves are fabricated on different locations and different orientation along the fibre surface, different fluids may be filled into different air-holes to form a hybrid fibre. As an example, we filled half of a pure-silica PCF by a fluid with n=1.480 by carving a rectangular groove on the fibre (Figure 1). Consequently, the half-filled PCF became a bandgap-guiding structure (upper half), resulted from a higher refractive index in the fluid rods than in the fibre core [3], and three bandgaps were observed within the wavelength range from 600 to 1700 nm. Whereas, the lower half (unfilled holes) of the fibre remains an air/silica index-guiding structure (Figure 1(b)). When the hybrid PCF is bent, its bandgaps gradually narrowed, resulted from the shifts of the bandgap edges. The bandgap edges had distinct bend-sensitivities when the hybrid PCF was bent toward different directions. Especially, the bandgaps are hardly affected when the half-filled PCF was bent toward the fluid-filled region. Such unique bend properties could be used to monitor simultaneously the bend directions and the curvature of the engineering structures.

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e-pub ahead of print date: 24 August 2010
Venue - Dates: Photon 10, United Kingdom, 2010-08-22 - 2010-08-25
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 340273
URI: http://eprints.soton.ac.uk/id/eprint/340273
PURE UUID: 3d48e8c8-5fbd-455f-a2f4-de8bb4215dc5

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Date deposited: 18 Jun 2012 13:15
Last modified: 02 Oct 2020 16:33

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