Scattering-Assisted and Logic-Controllable WGM Laser in Liquid Crystal Micropillar

Zhang, Jin Chuan; Zhu, Hong; Zhang, Yan Li; Zhu, Xiao Mei; Wang, Zhao; Chen, Fei Liang; Li, Ké; Li, Xiao Feng; Zhang, Wei Li

doi:10.1109/jlt.2022.3176401

Cited by 5 publications

(9 citation statements)

References 45 publications

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“…The mixed solution was siphoned into the core of a hollow-core optical fiber (HOF) with a diameter of 150 μm, and the outer diameter of the HOF is 365 μm. 44 The ends of a single-mode fiber (SMF) and a MMF were both perpendicularly cleaved and inserted into the HOF. The segment of the HOF between the fiber end faces is filled with gain medium to form a fiber microcavity confined by the inner wall of HOF.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The mechanism of such WGM lasing has been analyzed in our previous work. 44 Case II is the same as case I except that the SMF is uncoated. The results of case II are similar to those of case I except that the threshold of complexing lasing is higher for the same cavity length because the coating of the SMF can provide stronger feedback that helps laser emission.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In addition to the feedback effect of the cavity boundary, the weak scattering of LC molecules also builds efficient coupling channels in the medium inside the cavity, and both effects contribute to the construction of the self-guided liquid complex lasers. 44 Figure 2f gives the lasing threshold as a function of the cavity length for two cases. It shows that with increasing L, the external confinement gradually fails and the absorption loss in the nonpumped region increases, which leads to a higher lasing threshold.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The gain medium of our proposed laser is composed of 99.5 wt % eutectic mixture of nematic LC (see details in Figure S1) and 0.5 wt % laser dye pyrromethene 597 (from Exciton Company). The mixed solution was siphoned into the core of a hollow-core optical fiber (HOF) with a diameter of 150 μm, and the outer diameter of the HOF is 365 μm . The ends of a single-mode fiber (SMF) and a MMF were both perpendicularly cleaved and inserted into the HOF.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental setup of complex lasing is illustrated in Figure a. The laser was pumped by a 532 nm Q -switched laser (linearly polarized output) . To monitor the phase state of the gain medium as well as the position of the pump spot, a white light (WL) source, two polarizers ( P 1 and P 2 ), and a microscopic CCD were used together to photograph the samples through a polarized optical microscope.…”

Section: Resultsmentioning

confidence: 99%

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Photothermal Effect Controlled Complex Lasing for Decentralized Key Distribution

Zhu

Zhang

2022

ACS Photonics

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Laser emission in complex structures actively generates unclonable randomness in multidimensional domains, which has great potential for information security. Especially, developing security protocols with extended functions is urgently demanded by the Internet of Things and blockchain applications. Here, a fiber-type microcavity complex laser is developed with a random output spectrum and a bistable output intensity, wherein the dye-doped liquid crystal is used as the gain and hystereticmemory medium. The laser emits multiple spikes that vary randomly pulse-by-pulse in a relatively wide spectral band, and the logical/bistable "0" and "1" states of emission can be controlled by the photothermal effect. The lasers are proposed to act as active encryption units of end nodes in a network, wherein the spectra randomness is used to form random bit strings and the logical states are used to define the classification. Taking advantage of this hybrid advantage of complex lasing, a decentralized key distribution method is proposed with the function of key self-generation and self-direction at individual end nodes. This work would pave the way for information security in the decentralized network of multiscenario applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Photothermal Effect Controlled Complex Lasing for Decentralized Key Distribution

Zhu

Zhang

2022

ACS Photonics

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Microcavity Complex Lasers: from Order to Disorder

Zhu,

He,

Wang

et al. 2024

Annalen der Physik

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Microstructures, characterized by gain, nonlinearity, internal scattering, and boundary effects, offer an exceptional platform for exploring complex optical phenomena such as random lasing, chaos, and multidimensional speckles. Specifically, complex lasers generated within microcavities and optical fibers, where strong light confinement and scattering play diverse roles, have become a significant branch of laser research. Recently, the rapid advancement of materials, micro‐nano technologies, and artificial intelligence has introduced new opportunities and challenges for the generation, control, and application of complex lasers. This review systematically examines various types of microcavity complex lasers from the perspective of microcavity structures with different degrees of disorder. It primarily focuses on the historical development, characteristics, regulation, and applications of disordered microcavity lasers and concludes with a discussion on the future trends in the development of microcavity complex lasers.

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