Light trapping at Dirac point in 2D triangular Archimedean-like lattice photonic crystal

Abstract

Optical cavities and waveguides are critical parts of modern optical devices. Traditionally, optical cavities and waveguides rely on photonic bandgaps, or total internal reflection, to achieve light trapping. It has been reported that a novel light trapping, which exists in triangular and honeycomb lattices, is attributed to the so-called Dirac point. Our analysis reveals that 2D triangular Archimedean-like lattice photonic crystals also can support this Dirac mode with similar characteristics. This is a new type of localized mode with a different algebraic field profile at a different specified Dirac frequency, which is also beyond any complete photonic bandgap. The new wave localization has different features and can be applied to the design of new optical devices.

Observation of trapped light induced by Dwarf Dirac-cone in out-of-plane condition for photonic crystals

“…Earlier, light confining at a true DC has been reported. [17][18][19] It is already mentioned that the present case is not similar to those in Refs. [17]- [19] and these DDCs cannot support localized modes, [19] for these are points in the continuum.…”

“…[15] Dirac points in a 2D core-shell PC [16] have also been reported recently. By creating the appropriate defect, trapping of light [17,18] with frequencies at the Dirac point has been shown. Recently, Dirac point based guidance in optical fiber has also been demonstrated.…”

M-Point Lasing in Hexagonal and Honeycomb Plasmonic Lattices

“…T wo-and three-dimensional periodic dielectric structures known as photonic crystals can display photonic band gaps. 1,2 These stop bands at high-symmerty points in the first Brillouin zone of the reciprocal lattices can trap light 3 in the form of standing waves 4 as well as facilitate single-molecule detection and fluorescence enhancement. 5−7 Two-dimensional lattices of plasmonic metal nanoparticles (NPs) can support surface lattice resonances (SLRs), hybrid collective excitations that form between the localized surface plasmons (LSPs) of the NPs in the array and the diffractive photonic modes of the lattice.…”

“…Two- and three-dimensional periodic dielectric structures known as photonic crystals can display photonic band gaps. , These stop bands at high-symmerty points in the first Brillouin zone of the reciprocal lattices can trap light in the form of standing waves as well as facilitate single-molecule detection and fluorescence enhancement. − Two-dimensional lattices of plasmonic metal nanoparticles (NPs) can support surface lattice resonances (SLRs), hybrid collective excitations that form between the localized surface plasmons (LSPs) of the NPs in the array and the diffractive photonic modes of the lattice. − At the resonance condition, the SLR mode strongly localizes light at subwavelength volumes around the NPs and shows long-range standing wave characteristics at the band edge. − The optical band structure of SLRs can be exquisitely engineered by tuning NP characteristics (size, shape, and material) − or lattice parameters (symmetry and periodicity). − …”

Double resonance between corner states in distinct higher-order topological phases

“…This fact opens the possibility of investigating the emergence of corner states in other topological systems where there is no band gap, as in the case of the Dirac semimetals. In photonics, Dirac semimetals make their analogous appearance in photonic crystals (PhC) without photonic band gaps but in the presence of spectrally isolated Dirac points where the density of states (DOS) vanishes [19][20][21][22]. In Dirac photonic materials, the occurrence of power-law interactions leads to the exciting existence of topological [23] or pseudo-diffusive [24] photonic transport, Klein tunnelling [25], single-mode Berkeley Surface Emitting Lasers [26] and the possibility of obtaining decoherence-free interactions [27,28].…”