Ultrasmooth, biocompatible, and removable nanocoating for hollow-core microstructured optical fibers

Timur Ermatov*, Marina Novoselova, Julia Skibina, Andrey Machnev, Dmitry Gorin, Roman E. Noskov

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Functional nanocoatings of hollow-core microstructured optical fibers (HC-MOFs) have extended the domain of their applications to biosensing and photochemistry. However, novel modalities typically come with increased optical losses since a significant surface roughness of functional layers gives rise to additional light scattering, restricting the performance of functionalization. Here, the technique that enables a biocompatible and removable nanocoating of HC-MOFs with low surface roughness is presented. The initial functional film is formed by a layer-by-layer assembly of bovine serum albumin (BSA) and tannic acid (TA). The alkaline etching at pH 9 results in the reduction of surface roughness from 26 nm to 3 nm and decreases fiber optical losses by three times. The nanocoating can be fully removed within 7 min of the treatment. Natural biocompatibility of BSA alongside antibacterial and antifouling properties of TA makes the presented nanocoating promising for biophotonic applications.

Original languageEnglish
Pages (from-to)4828-4831
Number of pages4
JournalOptics Letters
Issue number19
StatePublished - 1 Oct 2021


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