Optical fiber inclinometer with dynamically controllable excitation length of quantum dots liquid-core waveguide based on a photo-controlled bubble

Weijiang Xu; Yi Liu; Jinke Bai; Yan Li; Shiliang Qu

doi:10.1364/OL.483220

Optics Letters
Vol. 48,
Issue 6,
pp. 1403-1406
(2023)
•https://doi.org/10.1364/OL.483220

Optical fiber inclinometer with dynamically controllable excitation length of quantum dots liquid-core waveguide based on a photo-controlled bubble

Weijiang Xu, Yi Liu, Jinke Bai, Yan Li, and Shiliang Qu

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Weijiang Xu, Yi Liu, Jinke Bai, Yan Li, and Shiliang Qu, "Optical fiber inclinometer with dynamically controllable excitation length of quantum dots liquid-core waveguide based on a photo-controlled bubble," Opt. Lett. 48, 1403-1406 (2023)

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Abstract

An ultracompact fiber inclinometer based on a bubble controlled by Marangoni force is proposed in this Letter. By coupling a 980-nm laser, the bubble can suspend in a quantum dots (QDs) liquid-core waveguide (LCW) due to the Marangoni effect. Under the excitation of a 405-nm laser, QDs LCW exhibit green emissions centered at 523 nm. When the tilt angle changes, the position of the bubble changes as well, which causes the variation of the 523-nm fluorescence intensity. The experimental results show that the sensitivity based on the peak intensity ratio (PIR) reaches 0.22/° with a linearity of 0.979 from 0° to 35°. Furthermore, the sensor has excellent stability and repeatability.

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Supplementary Material (3)

Name	Description
Supplement 1	Descriptions of attached movies. Study of the effective excitation length of the QDs liquid core waveguide (LCW) with bubbles and and bubbles of different sizes.
Visualization 1	When a 980 nm laser with the out power of 12.743 mW is coupled to the structure via MMF, the bubble moves down vertically and then suspends in the thick HCF. When the laser is turned off, the micro-bubble returns to the top of the thick HCF.
Visualization 2	After the driven power is increased to 17.570 mW, the bubble takes 1.1 s to move to the bottom of the thick HCF and subsequently stays still. When the laser is turned off, the micro-bubble returns to the top of the thick HCF after 1.0 s.

Data availability

The data that support the finding of this study are available from the corresponding author upon reasonable request.

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