Inkjet‐Printed Random Lasers

Liao, Yu‐Ming; Liao, Wei-Cheng; Chang, Shu‐Wei; Hou, Chen; Tai, Chia-Tse; Su, Chen-You; Hsu, Yun-Tzu; Wu, Meei-Maan; Chou, R. Yuanying; Lee, Yao-Hsuan; Lin, Shih-Yao; Lin, Win-Li; Chang, Cheng-Han; Haider, Golam; Kataria, Monika; Roy, P.; Bera, Krishna Prasad; Inbaraj, Christy Roshini Paul; Hu, Han‐Wen; Lin, Tai‐Yuan; Chen, Yang‐Fang

doi:10.1002/admt.201800214

Cited by 20 publications

(8 citation statements)

References 56 publications

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“…The extinction spectrum (Figure S9) is comparable with the simulation result of Ag NPs in a PVA environment with a diameter of ∼10 nm. 12,19,21 Standard R6G Solution Synthesis. Sixty milligrams of Rhodamine 6G (R6G) and 0.3 g of PVA were mixed and dissolved in 20 mL of DI water.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The adjective “smart” emphasizes the versatility of this ink, which makes these materials flexible to meet the demands of many purposes, especially the technologies related to optical-encoded systems. Considering the narrow line-width emission spectrum of RLs, this ink is a perfect choice to create wavelength-domain photonics code. ,, Besides, the threshold characteristic requires the excitation power density to be larger than the specified value for achieving the lasing condition, which makes it more difficult to duplicate. These features help in developing a brand new type of security ink that ameliorates the disadvantages of traditional luminescent ink.…”

Section: Introductionmentioning

confidence: 99%

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Multifunctional Random-Laser Smart Inks

Hou

Hsu

et al. 2020

ACS Appl. Mater. Interfaces

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With the superiority of laser-level intensity, narrow spectral line width, and broad-angular emission, random lasers (RLs) have drawn considerable research interests for their potential to carry out a variety of applications. In this work, the applications associated with optical-encoded technologies, including security printing, military friend or foe identification (FFI), and anticounterfeiting of documents are highlighted, and the concept of a transient RL “smart ink” has been proposed. The proof-of-concept was demonstrated as invisible signatures, which encoded the messages through the spectral difference of spontaneous emission and RL under specified conditions. Next, the possibility of encoding the data with multibit signals was further confirmed by exploiting the threshold tunability of RLs. Moreover, the transient characteristic of this smart ink and its capability to be attached on freeform surfaces of different materials were also shown. With the advantages of a facile manufacturing process and multiple purposes, it is expected that this ink can soon be carried out in a variety of practical utilities.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multifunctional Random-Laser Smart Inks

Hou

Hsu

et al. 2020

ACS Appl. Mater. Interfaces

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“…In general, almost all of the so-called wet processing techniques can be applied to fabricate random lasers. For example, Liao and coworkers have shown that polymeric random lasers can be easily printed using inkjet printers [ 35 ] or 3D printers [ 36 ]. More bizarre techniques, more suitable for biomaterials processing, can even involve such techniques as cooking.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Random Lasing Properties by Controlled Phase Separation Process in PMMA:PVK Dye-Doped Polymeric Blends

Cyprych

Sznitko

2021

Polymers

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This article describes the random lasing (RL) phenomenon obtained in a dye-doped, polymeric double-phase system composed of PMMA and PVK polymers. It shows how relative concentrations between mentioned macromolecules can influence lasing parameters of the resulting blends, including obtained emission spectra and threshold conditions. We describe the influence of lasers’ composition on their morphologies and link them with particular RL properties. Our studies reveal that the disorder caused by phase separation can support the RL phenomenon both in the waveguiding and quasi-waveguiding regimes. Changing the relative concentration of polymers enables one to switch between both regimes, which significantly influences threshold conditions, spectral shift, number of lasing modes, and ability to support extended and/or localized modes. Finally, we show that a simple phase separation technique can be used to fabricate efficient materials for RL. Moreover, it enables the tailoring of lasing properties of materials in a relatively wide range at the stage of the laser material fabrication process in a simple way. Therefore, this technique can be seen as a fast, cheap, and easy to perform way of random lasers fabrication.

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“…Since the first theoretical report of Letokhov and experimental breakthrough by Lawandy et al, random lasers have greatly attracted the attention of scientists as a booming laser field. In comparison with regular commercial lasers, the random laser is simpler and less costly to manufacture , and easier to tune. − Therefore, it has potential applications in many fields such as imaging, illumination, , sensing, − and information technology …”

Section: Introductionmentioning

confidence: 99%

Lotus-Leaf-Inspired Flexible and Tunable Random Laser

Líu

et al. 2020

ACS Appl. Mater. Interfaces

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We describe herein a flexible and tunable random laser made from a flexible poly(dimethylsiloxane) substrate. The substrate is prepared by casting via soft lithography from a lotus leaf to produce a micropapilla surface structure similar to that of a lotus leaf. The micropapilla provides efficient multiple scattering for the photons generated in the gain medium, and random lasing emerges because photons undergo closed-loop paths by scattering from three equilaterally arranged micropapillae. Given the diverse distribution of microscale features on the soft substrate, the random laser spectrum can be tuned by as much as 26.0 nm by changing the pump position. Furthermore, the random laser can be easily tuned by about 14 nm by flexing it, which modifies the micropapilla density and thereby changes the reabsorption strength of the laser dye. The photostability of the random laser is ensured by sealing the gain medium (i.e., dye solution) in a closed system. The results provide a promising method to realize a variety of laser-based applications such as optical biosensors on chips, microscale structural alteration detectors, flexible wearable devices, and multicolor (even white) random lasers.

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Inkjet‐Printed Random Lasers

Cited by 20 publications

References 56 publications

Multifunctional Random-Laser Smart Inks

Multifunctional Random-Laser Smart Inks

Tailoring the Random Lasing Properties by Controlled Phase Separation Process in PMMA:PVK Dye-Doped Polymeric Blends

Lotus-Leaf-Inspired Flexible and Tunable Random Laser

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