Solid-state random microlasers fabricated via femtosecond laser writing

Tomázio, Nathália B.; Sciuti, Lucas F.; Almeida, Guilherme Silva de; Boni, Leonardo De

doi:10.1038/s41598-018-31966-6

Cited by 10 publications

(3 citation statements)

References 31 publications

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“…Generally speaking, scattering is detrimental to laser action because it induces loss to the DFB polymer lasers. However, the combination of multiple scattering and high gain leads to random laser action [17,18,19,20,21,22]. So, simultaneous DFB lasing and random lasing are expected in one single integrated device if the scattering particles are introduced appropriately into the DFB cavity, which forms a periodic-random compound cavity.…”

Section: Introductionmentioning

confidence: 99%

Polymer Lasing in a Periodic-Random Compound Cavity

Zhai

et al. 2018

Polymers

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Simultaneous distributed feedback (DFB) lasing and linear polarized random lasing are observed in a compound cavity, which consists of a grating cavity and a random cavity. The grating cavity is fabricated by interference lithography. A light-emitting polymer doped with silver nanoparticles is spin-coated on the grating, forming a random cavity. DFB lasing and random lasing occur when the periodic-random compound cavity is optically pumped. The directionality and polarization of the random laser are modified by the grating structure. These results can potentially be used to design integrated laser sources.

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Section: Introductionmentioning

confidence: 99%

Polymer Lasing in a Periodic-Random Compound Cavity

Zhai

et al. 2018

Polymers

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“…For specular reflection‐based cavities, the free spectral range (FSR) is the distance between the two consecutive lasing peaks that remains constant in the spectrum. [ 29 ] Here, the FSR values for 26.6 µm‐length cavity showed a significant random variation of 1.85, 1.26, 1.56, 1.26, 1.34, 1.18, 1.81, and 1.64 nm indicating diffuse reflection‐based resonant oscillations.…”

Section: Resultsmentioning

confidence: 81%

Silk Nanocrack Origami for Controllable Random Lasers

Dogru-Yuksel

Jeong

Park

et al. 2021

Adv Funct Materials

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The ancient art of Origami started to evolve as a contemporary technological method for the realization of morphologically induced and unconventional advanced functional structures. Here, directional random lasers (RLs) that are formed by folding (i.e., ori) dye-doped natural protein silk fibroin (SF) film as paper (i.e., kami) are demonstrated. The folding stress induces parallel nanocracks that simultaneously function as diffuse reflectors and laser light outcouplers at the boundaries of the optical gain medium. Random lasing is observed after a threshold energy level of 0.8 nJ µm −2 with an in-plane divergence-angle of 13°. Moreover, the central laser emission wavelength is tuned from 588.7 to 602.1 nm by controlling the adjacent nanocracks distance and additional laser emission directions are introduced by further folding SF at different in-plane angles that induce rectangular and triangular geometries. More significantly, RL is fabricated via a quick, scalable, and environmentally friendly stress-induced nanocracking process maintaining its mechanical and optical properties even after 10,000 times of bending test. Hence, this study introduces a novel form of biocompatible, biodegradable, and large-area protein microlasers by using an unconventional laser fabrication approach.

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“…This close-loop formation can be only possible if we assume there are diffuse reflections at the edge of the microcrack. This assumption is reasonable because the sidewalls of the microcrack are rough and this phenomenon has been proposed previously in microstructures enabled by direct laser writing [41]. It is suggested that more studies including finite-difference time-domain simulation and PL mapping are needed to find the exact lasing mechanism.…”

Section: Lasing Emission From a Single Microcrackmentioning

confidence: 83%

High quality factor, protein-based microlasers from self-assembled microcracks

Nguyen

Hong

Thin

et al. 2021

J. Phys. D: Appl. Phys.

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In the last decade, microlasers with biological origin have shown their great potential in biosensing and bioimaging. Several micro-structures have been developed for high quality (Q) factor biolasers including Fabry–Pérot, distributed feedback and whispering gallery mode cavities. However, the fabrication of these lasers is generally complicated and their operation is strongly affected by cavity defects. In this work, we demonstrate random protein-based microlasers fabricated by a simple one-step self-assembled method. The lasing can be achieved from microcracks with random structures. The lasing threshold is around 14 mJ cm−2 and the quality factor of lasing modes can be up to 3 × 10 3 which are comparable with other conventional biolasers. Our work opens a new possibility for the fabrication of high Q factor microlasers from biocompatible materials, with great potential for biosensing and biomedical applications.

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Solid-state random microlasers fabricated via femtosecond laser writing

Cited by 10 publications

References 31 publications

Polymer Lasing in a Periodic-Random Compound Cavity

Polymer Lasing in a Periodic-Random Compound Cavity

Silk Nanocrack Origami for Controllable Random Lasers

High quality factor, protein-based microlasers from self-assembled microcracks

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