Low-threshold topological nanolasers based on second-order corner state

Abstract

The topological lasers, which are immune to imperfections and disorders, have been recently demonstrated based on many kinds of robust edge states, being mostly at microscale. The realization of 2D on-chip topological nanolasers, having the small footprint, low threshold and high energy efficiency, is still to be explored. Here, we report on the first experimental demonstration of the topological nanolaser with high performance in 2D photonic crystal slab. Based on the generalized 2D Su-Schrieffer-Heeger model, a topological nanocavity is formed with the help of the Wannier-type 0D corner state. Laser behaviors with low threshold about 1 $\mu W$ and high spontaneous emission coupling factor of 0.25 are observed with quantum dots as the active material. Such performance is much better than that of topological edge lasers and comparable to conventional photonic crystal nanolasers. Our experimental demonstration of the low-threshold topological nanolaser will be of great significance to the development of topological nanophotonic circuitry for manipulation of photons in classical and quantum regimes.

15 pages, 4 figures

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• Second Order Topological Insulator State in Hexagonal Lattices and its Abundant Material Candidates
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• Room-temperature continuous-wave Dirac-vortex topological lasers on silicon
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• Topological photonics: fundamental concepts, recent developments, and future directions
• Realization of a Z classified chiral-symmetric higher-order topological insulator in a coupling-inversion acoustic crystal
• Fano resonance from a one-dimensional topological photonic crystal
• Dual-Polarization Second-Order Photonic Topological Insulators
• Exact Higher-order Bulk-boundary Correspondence of Corner-localized States
• Higher-order topological states mediated by long-range coupling in $D_4$-symmetric lattices
• Topologically protected second-harmonic generation via doubly resonant high-order photonic modes
• Higher-order topology in monolayer graphene
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• Observation of $\pi$ solitons in oscillating waveguide arrays
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• Observation of Large-Number Corner Modes in $\mathbb{Z}$-class Higher-Order Topolectrical Circuits
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• Optimization and robustness of topological corner state in second-order topological photonic crystal
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• Floquet Mode Resonance: Trapping light in the bulk mode of a Floquet topological insulator by quantum self-interference
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• Single-mode lasing based on PT-breaking of two-dimensional photonic higher-order topological insulator
• Tunable two-dimensional laser arrays with zero-phase locking
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• Dirac cones and higher-order topology in quasi-continuous media
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• Observation of nonlinear topological corner states originating from different spectral charges
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• Engineering rich two-dimensional higher-order topological phases by flux and periodic driving
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• A new class of higher-order topological insulators that localize energy at arbitrary multiple sites
• Third-order Orbital Corner State and its Realization in Acoustic Crystals
• Topological Photonics on a Small Scale
• Nanoimprinted topological laser in the visible
• Phase fields in momentum space of photonic crystal slabs
• Layer-number parity induced topological phase transition