Abandoned Functionality of Thin‐Film Opal Photonic Crystals

Abstract

Angle‐resolved polarized transmission spectra of thin‐film opals are studied experimentally and theoretically as a function of the azimuthal rotation of the plane of incidence at different angles of light incidence. In such 3‐dimensional lattices, the refraction acquires the form of diffraction orders, each with a distinct spectrum, that propagate simultaneously along different directions. The corresponding continuous and patchy stop‐bands in the photonic energy band structure of the opal photonic crystal are determined numerically. For diffraction at high Miller index planes, the diffraction pattern is often distorted due to multiple‐wave diffraction. The finite stacking of hexagonally close‐packed layers leads to an intrinsic 3‐fold rotation symmetry of these spectra, which is particularly pronounced in transmission for frequencies that correspond to wave vectors within the 1st Brillouin zone. Despite the cubic symmetry of the opal lattice, cross‐polarization coupling effects occur in the volume of the opal crystal. These effects are associated with the fact that, the opal eigenmodes are Bloch waves whose electromagnetic field distributions and dispersion relations are markedly different from plane waves.

Polarization-selective branching of stop gaps in three-dimensional photonic crystals

“…This is assisted with branching of stop gaps in the optical reflectivity or transmission measurements [14][15][16]. Multiple Bragg diffraction in 3D photonic crystals has been a topic of intense research [17][18][19][20][21][22] and generally interpreted as the inherent property of photonic crystals using non-polarized light [19,[21][22][23][24][25][26]. Howbeit, formation of stop gap is a strong polarization-dependent process and hence polarization-resolved multiple Bragg diffraction is highly desirable.…”

Transformation of light polarization in thin-film opal photonic crystals

“…Specifically, the resonances are fully determined by the diffraction resonances in the co-polarized spectra (see Fig.10b). Thus, in all spectra the resonances correspond to the interaction of opal eigenmodes 10 . On the other hand, the resonance shape is different in the 700-850 nm spectral range, where Tsp looks like the inversion of the T+-spectrum.…”

“…It is worth noting that anti-crossing effects look different under p-polarized transmission (p-polarized incidence and p-polarized transmittance). Further details of the polarization anisotropy were described in our previous works 8 , 10 . Conversely, the pattern in the right panel of Fig.5 shows a doubling of the rotation symmetry from three-fold to six-fold.…”

“…This topic was extensively studied 3 , 4 , 5 , 6 , 7 and resulted in valuable information concerning mode dispersion, mode symmetry and further more specific features of light-matter interaction, notably for the lattice-specific high-symmetry directions of light propagation were the interaction between different plane waves is particularly strong 8 . Very recently, we demonstrated that opals provide complex polarization properties 9 , 10 .…”

Особенности Дифракции Света В Упорядоченном Монослое Сфер

“…С целью селективного возбуждения различных собственных резонансов изме-няют, как правило, угол падения света, его поляризацию и ориентацию плоскости падения света относительно решетки кристалла [21,22]. При этом порядки дифракции выше нулевого остаются неучтенными.…”