Transferable microfiber laser arrays for high-sensitivity thermal sensing

• Published in: Nanoscale 2023-11, Vol.15 (42), p.16976-16983
• Main Authors: Ruan, Jun, Li, Yixuan, Lin, Junzhe, Ren, Zihan, Iqbal, Naeem, Guo, Dan, Zhai, Tianrui
• Format: Article
• Language: English
• Subjects: Figure of merit; Laser arrays; Lasing; Membranes; Microfibers; Microlasers; Nanorods; Plasmons; Polydimethylsiloxane; Polymers; Power management; Sensitivity; Tuning
• ISSN: 2040-3364; 2040-3372
• DOI: 10.1039/d3nr03118g

Functional microfibers have attracted extensive attention due to their potential in health monitoring, radiation cooling, power management and luminescence. Among these, polymer fiber-based microlasers have plentiful applications due to their merits of full color, high quality factor and simple fabrication. However, developing a facile approach to fabricate stable microfiber lasing devices for high-sensitivity thermal sensing is still challenging. In this research, we propose a design of a stable and transferable membrane inlaid with whispering-gallery-mode plasmon hybrid microlaser arrays for thermal sensing. By integrating plasmonic gold nanorods with polymer lasing microfiber arrays that are embedded in the polydimethylsiloxane matrix, whispering-gallery-mode lasing arrays with high quality are achieved. Based on the thermo-optical effect of the membrane, a tuning range of 1.462 nm for the lasing peak shift under temperature variation from 30.6 °C to 38.7 °C is obtained. The ultimate thermal sensing sensitivity can reach up to 0.181 nm °C −1 and the limit of detection is 0.131 °C, with a high figure of merit of 2.961 °C −1 . Moreover, a stable laser linewidth can be maintained within the tuning range due to plasmon-improved photon confinement and PDMS-reduced scattering loss. This work is expected to provide a facile approach for the fabrication of high-sensitivity on-chip thermometry devices. We propose a design of stable and transferable membrane inlaid with whispering-gallery-mode plasmon hybrid microlaser arrays for sensitive and stable thermal sensing.