Low threshold incoherent random lasing with spectral overlap optimization of size-tuned plasmonic nanorods

Radhakrishnan, Gayathri; Monika, K; Murukeshan, Vadakke Matham; Vijayan, C.

doi:10.1016/j.optlastec.2021.106959

Cited by 20 publications

(17 citation statements)

References 38 publications

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“…The aspect ratio optimization can be done using theoretical modelling and has been detailed in our previous work. 39 Based on the theoretical modelling, silver nanostructures with aspect ratio in the range 8.6 to 57.7 exhibit optimal scattering and LSPR properties for efficient random lasing in the designed system. Silver nanostructures in this aspect ratio range is synthesized and dispersed in rhodamine 6G (R6G) gain medium (see Methods section for details on the synthesis of nanostructures and the fabrication of random laser).…”

Section: Resultsmentioning

confidence: 99%

“…Based on the theoretical optimization, silver nanostructures with aspect ratio in the range 8.6 to 57.7 exhibits optimal scattering and LSPR properties, and are expected to show better lasing performance. 39 Silver nanorods in this aspect ratio range is synthesized via a solution based two-step injection polyol process. 58 Solutions of PVP (2005 g), and AgNO 3 (2.038 g) are prepared separately in 34 ml and 6 ml of EG, respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Owing to their low spatial coherence, random lasers effectively reduce the speckle contrast instantaneously, and provide a good signal to noise ratio even in highly scattering environments. [37][38][39] Biological samples are oen highly diffusive, which lead to severe scattering, spatial cross talk, and coherent artefacts under conventional laser illumination. In this context, it is worthwhile to investigate the potential of random lasers for bioimaging applications.…”

Section: Introductionmentioning

confidence: 99%

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Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features

et al. 2022

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“…Multicrystalline structures with randomly distributed interfaces have supplied the optical scattering centers in most of the cases. Although random lasers are categorized into coherent [11][12][13][14] and incoherent types [15][16][17], reported random lasing processes using HOIPs are mostly based on incoherent processes, so that broad-band emission spectra are observed for these lasers.…”

Section: Introductionmentioning

confidence: 99%

Substrate Effects on the Random Lasing Performance of Solution-Processed Hybrid-Perovskite Multicrystal Film

2022

Crystals

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We report dependence of random lasing performance of directly spin-coated multicrystalline thin films of an organic–inorganic hybrid, halide perovskite CH3NH3PbBr3 (MAPbBr3), on different substrates. It was discovered that random lasing performance is strongly dependent on the surface energy properties of the substrate, which determine the morphology and crystallization properties of the spin-coated film, and will consequently determine its optical scattering and emission properties. Using indium–tin oxide (ITO)-coated glass, fused silica, and tricyclo[5.2.1.02,6] decanedimethanol diacrylate (ADCP)-coated fused silica as the substrate materials, we compared the spectroscopic response of the random lasers and thus justified the photophysical mechanisms involved. The modification of the surface properties of the substrate enables controlling of the MAPbBr3 crystallization and leads to the changing of the random lasing properties. The discoveries herein are also important for the construction of other types of laser devices, where the substrate effects should be considered during the design and preparation of the micro-/nano structures.

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Stereolithography Assisted Controllable Random Lasing Device for Tunable Threshold, Linewidth, and Wavelength

Gummaluri

Murukeshan

2022

Adv Eng Mater

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Additive manufacturing provides flexibility in making structures according to specific geometry requirements. Advances in this technology, including sophisticated laser‐based stereolithography (SLA) technique, have paved the way to fabricate structures with layer resolutions up to 25 μm. Although the feasibility of random lasing is shown in 3D‐printed structures, a study on varying lasing properties using SLA printing technique with continuous wave laser pumping is not studied yet in depth. Herein, SLA is used to fabricate structures conducive for random lasing. Randomly distributed vertical cylindrical microchannels are fabricated on a 1 cm × 1 cm photoresin chip of thickness 2 mm. The geometry of structures makes it viable for liquid optical gain media to be injected into the cylindrical channels. The random lasing characteristics are demonstrated including threshold and linewidths. Tunability in peak lasing wavelength, required threshold, and minimum achievable linewidth are demonstrated by changing the diameter of the microchannels. Further, it is shown that by changing the hole diameter from 260 to 470 μm, a wavelength tunability of approximately 22 nm is achieved. This structure expects to significantly contribute for its use as an on‐chip photonic sensor, wherein liquid analytes achieved can be injected and sensed using optical parameters, and for on‐chip spectroscopy applications.

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Low threshold incoherent random lasing with spectral overlap optimization of size-tuned plasmonic nanorods

Cited by 20 publications

References 38 publications

Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features

Plasmonic random laser enabled artefact-free wide-field fluorescence bioimaging: uncovering finer cellular features

Substrate Effects on the Random Lasing Performance of Solution-Processed Hybrid-Perovskite Multicrystal Film

Stereolithography Assisted Controllable Random Lasing Device for Tunable Threshold, Linewidth, and Wavelength

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