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

Abstract

To meeting the miniaturization and compatibility of current micro-nano optical devices, two-dimensional (2D) photonic crystals (PCs), which can manipulate the optical parameters and its propagation with more freedom degree, have...

Modulating Polarization in Second Harmonic Generation through Symmetry Evolution in Plasmonic Lattices

“…The incident light and emission light remain within the same plane, and the lattice's primitive vectors in real space, denoted by a 1 and a 2 , are indicated by black arrows. According to the orthogonal relationship between real space and reciprocal space, 15 the corresponding primitive reciprocal lattice vectors, b 1 and b 2 , are shown by black arrows in Figure 2b. Thus, the reciprocal lattice vectors can be expressed as G ij = ib 1 + jb 2 using vector operations in the light propagation of reciprocal space (Figure 2b), where i and j are integers representing the diffraction order (DO).…”

“…However, surpassing the conversion efficiency of SHG in lattice with centrosymmetric units compared to those with noncentrosymmetric units remains challenging, particularly when systematically investigating the impact of unit symmetry on harmonic generation behaviors, especially concerning variations in centrosymmetric units. Additionally, the optical behaviors of SHG can be influenced by the lattice geometry. − For instance, the dispersion, phase, and group velocity of Bloch modes can be tailored by adjusting the lattice period and arrangement . Bloch modes from a well-defined photonic lattice have a greater capacity to control the directional and polarization emission of SHG compared to those from a disordered lattice .…”

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

“…Considering the collective resonance in plasmonic lattices, its coupling strength and resonance wavelength mainly depend on the diffraction order (DO) modes from the lattice and LSPR modes from individual nanoparticles. Thereinto, DO vectors are determined by the lattice arrangement and constant, 17 and the LSPR mode is dependent on the size, structural symmetry, and material component of nanoparticles. The coupling of the two modes can be presented by angle-resolved spectroscopic system 18 and momentum-space image system, 19 which are preferred for investigating the interaction within plasmonic lattices.…”