Adaptive Wettability of a Programmable Metasurface

Specht, Marius; Berwind, Matthew; Eberl, C.

doi:10.1002/adem.202100680

Cited by 1 publication

(1 citation statement)

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“…Photonic micro-and nano-structuring of substrates is often carried out to achieve control of their hydrophilicity. [45][46][47][48][49][50] In general, two wetting states are possible for a sessile water drop in contact with a structured surface in air: i) a so-called Wenzel state, [51] and ii) a Cassie-Baxter state. [52,53] The main difference between the two of them is that, for the Wenzel state, water molecules can diffuse into the roughness interstitials, thus increasing the wetted surface with respect to the un-patterned flat area.…”

Section: Solubility and Engineering Of The Hydrophobicitymentioning

confidence: 99%

Micro‐ and Nano‐Structured Bacteria Growth Media for Planar Bio‐Photonics

Caligiuri,

Leone,

Favale

et al. 2023

Advanced Optical Materials

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Bio‐inspired and biodegradable quantum optics scenarios constitute a pathway toward environmentally friendly front‐end technologies. Such an inspiring perspective necessitates the replacement of classic gain materials with a biological counterpart like photoluminescent bacteria. It is easy to imagine that, in this case, a planar and cell‐viable substitute of classic bulk solid‐states resonators can be highly beneficial. In this paper a micro‐ and nano‐photonic structuration of both a standard and a functionalized version of a typical bacterial growth medium (Luria‐Bertani Agar – LBA) is successfully realized. Three structures belonging to the categories of photonic crystals are replicated, such as quasi‐crystals and meta‐surfaces, demonstrating how the proposed media can be used as templates for high‐end photonic applications. The optical quality of the replicated structures is confirmed by far‐field diffraction measurements. The structured growth media allow for a broad control of the surface wettability by accessing a so‐called Wenzel state, in which the original hydrophilicity of a material is increased due to the photonic structuration. Finally, the suitability of the nano‐structured LBA as a plasmonic platform is evidenced. The proposed micro‐and nano‐structured photonic growth media constitute the first, fundamental step toward quantum optical frameworks from biological media.

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