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- Title
Shaping in the Third Direction: Self-Assembly of Convex Colloidal Photonic Crystals on an Optical Fiber Tip by Hanging Drop Method.
- Authors
Sandu, Ion; Antohe, Iulia; Fleaca, Claudiu Teodor; Dumitrache, Florian; Urzica, Iuliana; Brajnicov, Simona; Iagaru, Romulus; Sava, Bogdan Alexandru; Dumitru, Marius
- Abstract
High-quality convex colloidal photonic crystals can be grown on the tip of an optical fiber by self-assembly using the hanging drop method. They are convex-shaped, produce the diffraction of reflecting light with high efficiency (blazing colors), and have a high curvature. The convex colloidal crystals are easily detachable and, as free-standing objects, they are mechanically robust, allowing their manipulation and use as convex reflective diffraction devices in imaging spectrometers. Currently, the same characteristics are obtained by using gratings-based structures. The optical fiber/colloidal crystal interface is disordered; thus, no light diffraction can be registered. The ordering at this interface was highly increased by forming a polystyrene spacer on the optical fiber tip, which served as a self-assembly substrate for silica colloid, as a mechanical bond between the fiber and the crystal, and as a filler reservoir for an inverse-opal synthesis. The silica opal-like grown on the optical fiber tip can be transformed into a high-quality polystyrene (blazing colors) inverse-opal by using the polystyrene spacer as a filler. We found that the colloidal crystal axisymmetric self-assembles onto the optical fiber tip only if a maximum volume of the colloid drop is settled on a flat end of the polystyrene spacer.
- Subjects
PHOTONIC crystal fibers; COLLOIDAL crystals; OPTICAL fibers; CRYSTAL whiskers; OPTICAL diffraction; PHOTONIC crystals
- Publication
Polymers (20734360), 2024, Vol 16, Issue 1, p33
- ISSN
2073-4360
- Publication type
Article
- DOI
10.3390/polym16010033