Ultrafast volume holography for stretchable photonic structures.
TLDR
This work proposes the concept of "ultrafast volume holography" for the fabrication of stretchable photonic structures such as tunable VPGs directly in unmodified PDMS, and translates insights in heat regulation via fs repetition rate control into volumetric patterning, forming periodic refractive index modulation in PDMS without post-processing.Abstract:
Stretchability and flexibility are two key requirements for manipulating the propagation of light in compact and high-performance lab-on-a-chip systems. These requirements are best met by embedding stretchable and flexible tuning elements such as volume phase gratings (VPGs) in polydimethylsiloxane (PDMS), making them attractive alternatives to conventional rigid optical elements. However, fabrication of these PDMS VPGs is a challenge, requiring extensive modifications to PDMS or complex multi-step processes that require long processing times. In this context, we propose the concept of “ultrafast volume holography” for the fabrication of stretchable photonic structures such as tunable VPGs directly in unmodified PDMS. Our concept translates insights in heat regulation via fs repetition rate control into volumetric patterning, forming periodic refractive index modulation of 1.95 × 10−4 in the PDMS without post-processing. VPGs formed are further demonstrated as active beam steering units and tunable spectroscopic optical elements.read more
Citations
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From flexible electronics to flexible photonics: A brief overview
Giancarlo C. Righini,Justyna Krzak,Anna Lukowiak,Guglielmo Macrelli,Stefano Varas,Maurizio Ferrari +5 more
TL;DR: A brief overview of this broad area is presented, underlining the achievements and the remaining challenges in the different routes to the manufacturing of flexible photonic devices, and it is interesting to note that glassy materials still constitute a fundamental piece in the present and future scenario.
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Fabrication of PDMS-based volume Bragg gratings by stitching of femtosecond laser filament
Kentaro Homma,Wataru Watanabe +1 more
TL;DR: In this paper, the authors demonstrate the fabrication of poly-(dimethylsiloxane) (PDMS)-based volume Bragg gratings (VBGs) by stitching of femtosecond laser filament.
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New Approach toward Laser-Assisted Modification of Biocompatible Polymers Relevant to Neural Interfacing Technologies.
N.E. Stankova,A.S. Nikolov,Ekaterina Iordanova,G. Yankov,Nikolay N. Nedyalkov,Petar A. Atanasov,Dragomir Tatchev,Eugenia Valova,Konstantin Kolev,Stephan Armyanov,Daniela Karashanova,Naoki Fukata +11 more
TL;DR: In this paper, a laser assisted modification of biocompatible polydimethylsiloxane (PDMS) elastomers relevant to the fabrication of stretchable multielectrode arrays (MEAs) devices for neural interfacing technologies is reported.
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Laser Written Stretchable Diffractive Optic Elements in Liquid Crystal Gels
Bohan Chen,Zimo Zhao,Camron Nourshargh,Chao He,Patrick S. Salter,Martin J. Booth,Steve J. Elston,Stephen Morris +7 more
TL;DR: In this article , a method of fabricating mechanically tunable diffraction gratings in stretchable liquid crystal gels is demonstrated using a combination of two-photon polymerization direct laser writing (TPP-DLW) and ultraviolet (UV) irradiation.
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Few-mode elastomeric optical fibers
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TL;DR: In this article, a new approach for producing elastomeric optical fibers with an optical behavior corresponding to a few-mode optical fiber is presented, and the fiber potential has been assessed through two basic experiments, highlighting the benefits of elasticity and a reduced core diameter.
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