Topological nanophotonics
On the time evolution at a fluctuating exceptional point
We theoretically evaluate the impact of drift-free noise on the dynamics of ${cal P}{cal T}$ -symmetric non-Hermitian systems with an exceptional point, which have recently been proposed for sensors. Such systems are currently considered as promising …
Topologically protected entangled photonic states
Entangled multiphoton states lie at the heart of quantum information, computing, and communications. In recent years, topology has risen as a new avenue to robustly transport quantum states in the presence of fabrication defects, disorder, and other noise …
Bulk-edge correspondence and long-range hopping in the topological plasmonic chain
The existence of topologically protected edge modes is often cited as a highly desirable trait of topological insulators. However, these edge states are not always present. A realistic physical treatment of long-range hopping in a one-dimensional dipolar …
Photonic topological phase transition on demand
On-demand, switchable phase transitions between topologically nontrivial and trivial photonic states are demonstrated. Specifically, it is shown that the integration of a two-dimensional array of coupled ring resonators within a thermal heater array enables …
Simultaneous TE and TM designer surface plasmon supported by bianisotropic metamaterials with positive permittivity and permeability
Surface plasmon polaritons (SPPs) are surface modes existing at the interface between a metal and a dielectric material. Designer SPPs with a customer-defined property can be supported on the surface of suitably engineered metallic structures. They are …
Designing photonic topological insulators with quantum-spin-Hall edge states using topology optimization
Designing photonic topological insulators (PTIs) is highly non-trivial because it requires inversion of band symmetries around the band gap, which was so far done using intuition combined with meticulous trial and error. Here we take a completely different …
Topologically protected broadband rerouting of propagating waves around complex objects
Achieving robust propagation and guiding of electromagnetic waves through complex and disordered structures is a major goal of modern photonics research, for both classical and quantum applications. Although the realization of backscattering-free and …
Singularities in the flying electromagnetic doughnuts
Flying doughnuts (FDs) are exact propagating solutions of Maxwell equations in the form of single-cycle, space-time non-separable toroidal pulses. Here we review their properties and reveal the existence of a complex and robust fine topological structure. In …
Photonic analogues of the Haldane and Kane-Mele models
The condensed matter Haldane and Kane-Mele models revolutionized the understanding of what is an “insulator,” as they unveiled novel classes of media that behave as metals near the surface, but are insulating in the bulk. Here, we propose exact …
Unidirectional Maxwellian spin waves
In this article, we develop a unified perspective of unidirectional topological edge waves in nonreciprocal media. We focus on the inherent role of photonic spin in nonreciprocal gyroelectric media, i.e. magnetized metals or magnetized insulators. Due to the …
Electrically defined topological interface states of graphene surface plasmons based on a gate-tunable quantum Bragg grating
A periodic metagate is designed on top of a boron nitride-graphene heterostructure to modulate the local carrier density distribution on the monolayer graphene. This causes the bandgaps of graphene surface plasmon polaritons to emerge because of either the …
Quantitative robustness analysis of topological edge modes in C6 and valley-Hall metamaterial waveguides
Recent advances in designing time-reversal-invariant photonic topological insulators have been extended down to the deep subwavelength scale, by employing synthetic photonic matter made of dense periodic arrangements of subwavelength resonant scatterers. …