A humidity-tailored film random laser

Hu, Mengnan; Bian, Yaoxing; Shen, Huihui; Wang, Zhaona

doi:10.1016/j.orgel.2020.105923

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…Basically, RL behaviors are sensitive to variations in random media, such as variations in gain media [ 13 , 53 , 93 , 118 ], scatterers [ 54 , 91 , 111 ] and the refractive index of the solvent [ 55 , 56 , 60 ]. Changes in the external environment, such as the humidity [ 153 ], temperature [ 8 , 154 , 155 ] and PH value [ 59 ], can also lead to variations in RL features. In addition, optomechanical strains have been detected through RL features both in biological hard tissues [ 26 ] and soft tissues [ 57 ].…”

Section: Applications Of Rlsmentioning

confidence: 99%

Properties and Applications of Random Lasers as Emerging Light Sources and Optical Sensors: A Review

Späth

Klämpfl

et al. 2022

Sensors

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In a random laser (RL), optical feedback arises from multiple scattering instead of conventional mirrors. RLs generate a laser-like emission, and meanwhile take advantage of a simpler and more flexible laser configuration. The applicability of RLs as light sources and optical sensors has been proved. These applications have been extended to the biological field, with tissues as natural scattering materials. Herein, the current state of the RL properties and applications was reviewed.

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Section: Applications Of Rlsmentioning

confidence: 99%

Properties and Applications of Random Lasers as Emerging Light Sources and Optical Sensors: A Review

Späth

Klämpfl

et al. 2022

Sensors

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“…Figure 4 a presents the schematic illustration of the wearable sensor attached to different body parts. When the RH of the environment increases, the average refractive index of the polymer film decreases, owing to absorbing the water molecules in the air and leading to the blue-shifting of the spectrum of the random laser [ 36 ]. In addition, the concentration of gain material decreases with water molecules adsorbed into the polymer film, which can also cause the blue-shifting of the lasing mode.…”

Section: Resultsmentioning

confidence: 99%

Large-Area Biocompatible Random Laser for Wearable Applications

Guo

et al. 2021

Nanomaterials

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Recently, wearable sensor technology has drawn attention to many health-related appliances due to its varied existing optical, electrical, and mechanical applications. Similarly, we have designed a simple and cheap lift-off fabrication technique for the realization of large-area biocompatible random lasers to customize wearable sensors. A large-area random microcavity comprises a matrix element polymethyl methacrylate (PMMA) in which rhodamine B (RhB, which acts as a gain medium) and gold nanorods (Au NRs, which offer plasmonic feedback) are incorporated via a spin-coating technique. In regards to the respective random lasing device residing on a heterogenous film (area > 100 cm2), upon optical excitation, coherent random lasing with a narrow linewidth (~0.4 nm) at a low threshold (~23 μJ/cm2 per pulse) was successfully attained. Here, we maneuvered the mechanical flexibility of the device to modify the spacing between the feedback agents (Au NRs), which tuned the average wavelength from 612.6 to 624 nm under bending while being a recoverable process. Moreover, the flexible film can potentially be used on human skin such as the finger to serve as a motion and relative-humidity sensor. This work demonstrates a designable and simple method to fabricate a large-area biocompatible random laser for wearable sensing.

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“…Mengnan Hu et al recently Published a new RL that could be tailored with humidity. 71 In this article, they used materials such as glycerine and chitosan as water absorbers.…”

Section: Rl With Controllable Wavelengths Multi-colour Random Lasers:...mentioning

confidence: 99%

“…Mengnan Hu et al recently Published a new RL that could be tailored with humidity. 71 In this article, they used materials such as glycerine and chitosan as water absorbers. Here the gain is provided by R6G, and optimum feedback is given by silver Nanoflowers (scatterers).…”

Section: Advanced Materials For Enhancing the Performance And Propert...mentioning

confidence: 99%