Аннотация:Visible photonic crystals based on polymer microspheres were widely used in science and its various applications at the beginning of the 21st century as multifunctional materials. They are based on flat or spatial ordered structures of polymer (polystyrene, PMMA and others) submicron-sized microspheres.Such structures are obtained by self-organization on the surface of various solid substrates. A feature of such structures is the presence of a selective spectrum of reflected radiation from their surface when they are irradiated with light with a wide band. Experiments show that changing the size of the microspheres changes the maximum of the spectrum of the reflected radiationaccording to the Bragg-Snell law. The use of polymer microspheres of 6-200 microns in size as elements for creating ordered structures allows us to expand the spectrum of selective reflected radiation up to the radio range.We used monolayers of dense hexagonal packing of polystyrene microspheres with a diameter of 6-200 μm, deposited on a polycarbonate substrate. The sample was irradiated with terahertz radiation with a bandwidth of up to 3.5 THz. The reflected normalized emission spectrum in the figure is represented by a blue line. The graph shows that the width of the reflected signal is at least two times narrower compared to the reference irradiating effect. The data obtained allow us to conclude that ordered structures of polymer microspheres in the region of the terahertz range of wavelengths behave similarly to photonic crystals of the visible range.
