Evolution of High Symmetry Points of Photonic Alumina Superlattices in a Lithography-Free Approach

Abstract

Ceaselessly increasing demands for elaborate nanostructures prompt advanced structure fabrication with good practicability, especially, subwavelength ordered structures in simple lattices even in superlattices over a large area, namely, large-scale photonic lattices, in which lattice arrangement, geometry, and components of unit cells are key factors for their macroscopic optical properties. Moreover, exciting properties always occur at high symmetry points of the lattice; therefore, straightforward modulation of symmetry points over a large area is very important for the investigation and application of photonic lattices. Here, this work establishes a lithography-free approach of undervoltage oxidation (UVO) for regulating high symmetry points in the reciprocal space of a dielectric alumina superlattice. Embedding subunit cells at high symmetry points Γ (M) result in the degenerate energy changing from 1.34 eV (924.6 nm) to 1.87 eV (662.6 nm) under normal excitation at the Γ point, and the degeneracy lifting under off-normal excitation along the Γ–X high symmetry orientation. Furthermore, systematic characterizations of the alumina membrane are presented to learn its dynamic evolution of the morphology on a centimeter scale, and the pore array changes from a hierarchical period to a form of hexagonal close packing, especially at Γ and M points of the square lattice. Therefore, the reported lithography-free alumina-based nanofabrication offers an ability for varying the spatial structure at high symmetry points of photonic lattices, which is of great significance in the fields of nanomanufacturing and has great potential to bring about preferable performances in nanodevices.

Direction- and polarization-tunable spontaneous emission beneficial from diffraction orders of a square R6G-nanopore array

“…[6][7][8] Two-dimensional (2D) photonic crystals (PCs), as an articial periodic structure, 9,10 have attracted extensive attention from the scientic community due to their exibility and controllability in light regulation. 11,12 They show signicant promise in holographic imaging, 13 polarization imaging, [14][15][16] optical communication, 17,18 and optical sensing application potential 19,20 because of the far-eld diffraction in 2D PCs. Therefore, the desired appealing optical parameters can be achieved through the elaborate design of 2D PCs, especially for structural symmetry and the unit cell design.…”

Overview of Engineering Carbon Nanomaterials Such As Carbon Nanotubes (CNTs), Carbon Nanofibers (CNFs), Graphene and Nanodiamonds and Other Carbon Allotropes inside Porous Anodic Alumina (PAA) Templates

“…In particular, for a wide range of applications, such as nanoelectronics devices [ 11 ], filtration membranes [ 12 , 13 ], photodetectors [ 14 ], and charge storage [ 15 ] the fabrication of a membrane with uniform pores is critical for achieving better performance than membranes composed of randomly distributed bundles of carbon (or other) nanostructures. Compared to the relative expensive lithography-based approaches [ 16 ], template-based synthesis approaches provide a relatively simple route to prepare scalable 0-D and 1-D nanostructure arrays.…”

Surface lattice resonances enhanced directional amplified spontaneous emission on plasmonic honeycomb nanocone array

“…10 With the advancement of nanofabrication technology, various configurations of nanostructures for periodic photonic lattices have been developed. 11,12 In particular, the surface electromagnetic waves modulated by the plasmonic lattice and the dipole interaction between adjacent particles may cause an additional collective resonance. 13 This resonant mode is called surface lattice resonance (SLR) and results in a reduction of the dissipation partially and stronger near-field enhancement compared to that of single nanoparticles.…”

“…24 Interestingly, anodized aluminum oxide (AAO) membrane is widely used for preparing ordered large-area nano arrays with controllable parameters. 12,[27][28][29] With the exploration and application of AAO membranes, the residual aluminum substrate is found to be an excellent candidate for constructing tip-feature nanostructures. 13 In this work, a directional and polarized ASE is realized on the tip-featured nanocone array and analyzed from the momentum-space energy band of the honeycomb lattice.…”

“…24 Interestingly, anodized aluminum oxide (AAO) membrane is widely used for preparing ordered large-area nano arrays with controllable parameters. 12,27–29 With the exploration and application of AAO membranes, the residual aluminum substrate is found to be an excellent candidate for constructing tip-feature nanostructures. 13…”