Lasing action in microdroplets modulated by interfacial molecular forces

Qiao, Zhen; Gong, Xuerui; Guan, Peng; Yuan, Zhiyi; Feng, Shilun; Zhang, Yiyu; Kim, Munho; Chang, Guo‐En; Chen, Yu‐Cheng

doi:10.1117/1.ap.3.1.016003

Cited by 17 publications

(23 citation statements)

References 39 publications

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“…When the microdroplet touched the surface of the silica fiber, the noodle tip was drawn back and a thin solution film was left on the microfiber, and the solution shrank to rapidly form a 3D-curved microcavity due to surface tension . The droplet surface tension was calculated to be 68.04 [mN/m] . Three gain mediums are employed as the active materials, rhodamine 6G (R6G), stilbene 420 (S420), and Uranin (NaFL) (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, due to the strong light–matter interactions, droplet microcavity lasers have emerged as promising platforms to offer a great number of opportunities for chemical detection in lab-in-a-droplet where an optical cavity created with a liquid is both the sensing unit and the sample under analysis. , To achieve single-mode lasing sensing schemes for monitoring the chemical reaction process, the investigation of optical properties of droplet microcavity lasers also requires a further improvement.…”

Section: Introductionmentioning

confidence: 99%

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Direction-Adjustable Single-Mode Lasing via Self-Assembly 3D-Curved Microcavities for Gas Sensing

Zhang

Liang

Shi

et al. 2021

ACS Appl. Mater. Interfaces

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Drop-based microcavity lasers emerged as a promising tool in modern physics investigation and chemical detection owing to their cost-effective fabrication, high luminescence, and sensitive molecule sensing. However, it is of great challenge to achieve highly directional emission along with high quality (Q) factors via traditional droplet self-assembly behavior of the gain medium on a planar substrate. In this work, a single-mode microcavity laser with directional far-field emission is first proposed via droplet self-assembly 3D-curved microcavities, and simultaneously, acetic acid (AcOH) gas sensing is realized. Trichromatic single-mode lasing in 3Dcurved microcavities with distinct organic polymer droplets is constructed on silica fibers via a self-assembly procedure. By regulating the curvature of the substrate, mode selection and directional emission of the lasing action are realized. The measured Q-factor of the proposed anisotropic 3D-curved active microcavity is ∼20k. Furthermore, on account of the sensitive responsiveness of liquid organic polymers, single-mode laser sensors can be realized by measuring the shift of their lasing modes on exposure to organic vapor. Benefiting from chemical reaction with rhodamine 6G, the AcOH gas sensor displays a short response time. These results may open new insights into drop-based quasi-3D-anisotropic whispering-gallery-mode microcavities to improve the development of lab-in-a-droplet, ranging from a tuneable microcavity laser to a chemical gas sensor.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Direction-Adjustable Single-Mode Lasing via Self-Assembly 3D-Curved Microcavities for Gas Sensing

Zhang

Liang

Shi

et al. 2021

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…Besides the semispherical droplets, the bottom DBR reflector also plays an important role in the resonance like reducing the laser threshold or achieving the single-mode laser emission. [86] Vollmer's group presented a plasmonic coupled WGM cavity to boost the limits in single-molecule detection. [87,88] The evanescent field of WGM cavity excites the LSPR of nanorods at the external surface of WGM cavity.…”

Section: Hybrid Cavitiesmentioning

confidence: 99%

Optical Resonator Enhanced Photovoltaics and Photocatalysis: Fundamental and Recent Progress

Yuan

Chen

2021

Laser & Photonics Reviews

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Solar light is recognized as one of the most valuable sustainable energy sources of the future. Finding solutions to enhance energy-conversion efficiency is of paramount significance for realizing more efficient photovoltaic and photocatalytic devices. Remarkable development in chemical and physical strategies has been explored to increase the optical-absorption coefficients, extend the spectral range, and optimize the light-harvesting and conversion efficiency. Optical resonators, which play a ubiquitous role in modern optics, possess the unique ability to provide strong optical confinement and enormous light-matter interactions. Such features have attracted tremendous attention in photoelectric enhancement and applications in photovoltaic, photocatalysis, and even light-emitting devices recently. This review presents theoretical as well as experimental progress on enhanced photovoltaic and photocatalysis by exploiting optical resonators. Fundamentals of various optical cavities are discussed according to confinement and photoelectric enhancing mechanism, including Fabry-Perot, whispering gallery mode, photonic crystal, plasmonics, and hybrid cavities. Finally, the application prospects of cavity-enhanced photoelectric effect, including strong coupling, cavity design, and challenges are discussed. It is envisioned that the successful implementation of optical resonators in photoenergy applications may open a promising avenue for a broad spectrum of light-energy-conversion technologies.

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“…Micro- and nanolasers are introducing paradigms in a broad range of applications, such as integrated photonics, − communication, , lighting, , multicolor display, − and biological detections. − In particular, recent development in programmable microlasers has attracted great attention for its capability to control optical properties in various aspects, including lasing direction, lasing pulses, and lasing emission wavelengths . Numerous investigations on optical cavity structures and materials have been delivered to improve the optical performance of various lasers in the past decade, including semiconductor laser diodes, quantum dot lasers, organic microlaser arrays, plasmonic nanolasers, and optofluidic fiber lasers. − Among these, optofluidic fiber lasers (OFLs), which take advantage of integrating fiber cavities and aqueous gain medium, have contributed significantly to the development of compact photonic devices. − Optofluidics provides the microfluidic reconfigurability and the photonic integration to embrace excellent prospects in developing miniaturized coherent light sources with programmable laser spectrum tuning and reconstruction. − One of the most promising features of OFLs is the ability to achieve multicolor or multi-wavelength lasing emission over a broad spectral range, which is particularly useful in biochemical sensing and imaging. , …”

Section: Introductionmentioning

confidence: 99%

Programmable Rainbow-Colored Optofluidic Fiber Laser Encoded with Topologically Structured Chiral Droplets

et al. 2021

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Optofluidic lasers are emerging building blocks with immense potential in the development of miniaturized light sources, integrated photonics, and sensors. The capability of on-demand lasing output with programmable and continuous wavelength tunability over a broad spectral range enables key functionalities in wavelength-division multiplexing and manipulation of light-matter interactions. However, the ability to control multicolor lasing characteristics within a small mode volume with high reconfigurability remains challenging. The color gamut is also restricted by the number of dyes and emission wavelength of existing materials. In this study, we introduce a fully programmable multicolor laser by encapsulating organic-dye-doped cholesteric liquid crystal microdroplet lasers in an optofluidic fiber. A mechanism for tuning laser emission wavelengths was proposed by manipulating the topologically induced nanoshell structures in microdroplets with different chiral dopant concentrations. Precision control of distinctive lasing wavelengths and colors covering the entire visible spectra was achieved, including monochromatic lasing, dual-color lasing, tri-color lasing, and white colored lasing with tunable color temperatures. Our findings revealed a CIE color map with 145% more perceptible colors than the standard RGB space, shedding light on the development of programmable lasers, multiplexed encoding, and biomedical detection.

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Lasing action in microdroplets modulated by interfacial molecular forces

Cited by 17 publications

References 39 publications

Direction-Adjustable Single-Mode Lasing via Self-Assembly 3D-Curved Microcavities for Gas Sensing

Direction-Adjustable Single-Mode Lasing via Self-Assembly 3D-Curved Microcavities for Gas Sensing

Optical Resonator Enhanced Photovoltaics and Photocatalysis: Fundamental and Recent Progress

Programmable Rainbow-Colored Optofluidic Fiber Laser Encoded with Topologically Structured Chiral Droplets

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