Photonic crystals have a unique optical properties and are characterized by a periodic structure. Photonic glass, on the contrary, have a disordered structure, but also interesting from the point of view of use in future optical devices. Is it possible to combine two mutually exclusive properties in one material? This question is answered by an international team of researchers, which includes the owner megagranta
It is known that
Scientists continue this analogy and suggested that in photonics, along with regular structures can be created and some amorphous, disordered material. Such material
An international team of researchers from the
The synthesis of nanostructures was implemented using a three-dimensional laser lithography, which consisted of layered processing photosensitive material with a laser beam. The sequential scanning laser polymerization occurs in the areas of the photoresist in which the beam is in focus, while the rest of the structure of the material remained unchanged. Then, with a developer scientists removed the material is not exposed to intense laser radiation. The very process of the beam was controlled by a complex system of positioning, which was ruled by a computer program.
The problem of synthesis of photonic glasses researchers solved in two stages. At the first stage of the method described above was obtained classical photonic crystal in which the interlayer air alternated with cylinders with a diameter of 740 nm photoresist. Successive field of air cylinders and form a periodic structure, which gave special photonic crystal optical properties.
At the second stage, the researchers modified the synthesis parameters: increased scanning speed, the power of the laser radiation and limited acceleration, the system of positioning in the horizontal plane. The result was also obtained by the periodic structure of alternating areas air cylinder, but in this case the cylinders were not homogeneous and consist of small voids and different elements.
Thus, the very structure of the periodic properties of the material on him closer to a photonic crystal and a disordered structure of the components of its cylinders — to the photon glass. Study of the optical properties of photonic kvazistekla that the type of structure is located between the two materials antagonist, is an interesting and non-trivial task, which the authors have promised to work to implement in their next article.
This work was supported
Source of information:
II Shishkin, KB Samusev, MV Rybin, MF Lemons, YS Kivshar, A. Gaydukeviychute, RV Kiyan, BN Chichkov "glassy nanostructure fabricated by laser lithography."