Abstract
We present both numerical and experimental studies of an all-fiber device based on the integration of metallic electrodes into photonic crystal fibers (PCF). The device operation consists on applying electrical current to the electrodes which, by Joule effect, expand and squeeze the PCF microstructure in a preferential direction, altering both phase and group birefringence. We investigate the effect of integrating electrodes into the fiber and the dependence of the device sensitivity on the electrode configuration and composition.
Highlights
Optical devices permit one to controllably change properties of light propagating through a medium
In photonic crystal fibers (PCF)’s, on the other hand, the main approach is to insert electro-magneto-temperature sensitive materials inside the fiber. This approach does not explore the possibility of creating all-fiber devices
We fabricated a special kind of PCF with two external holes that can be used to squeeze the microstructure during fabrication, making ultra-high birefringent fibers [7] or, in a post-process step, be used to integrate electrodes [8]
Summary
Optical devices permit one to controllably change properties of light propagating through a medium. In PCF’s, on the other hand, the main approach is to insert electro-magneto-temperature sensitive materials inside the fiber (e.g. liquid crystals [5] or temperature dependent polymers [6]) This approach does not explore the possibility of creating all-fiber devices. The alloy was inserted in the liquid state and cooled down to room temperature [2,3,4, 8] Devices made with these fibers can work applying electric field or electrical current in the electrode(s). Temperature causes the electrodes to expand inducing mechanical stress These two effects depend linearly on the square of the electrical current since they come from power dissipation. We present a numerical and experimental study of the thermo-mechanical-optical behavior of a PCF with integrated electrodes aiming the adjustment of its optical properties
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