Lasing at Multidimensional Topological States in a Two-Dimensional Photonic Crystal Structure

Han, Changhyun; Kang, Minsu; Jeon, Heonsu

doi:10.1021/acsphotonics.0c00357

Cited by 72 publications

(40 citation statements)

References 51 publications

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“…We have also observed light emission from both edge-state and corner-state in a larger-size photonic cavity with reduced coupling between the corners. Very recently, lasing in a single corner has been reported for similar nanopatterned structures 35,36 . Those corner lasers, however, operate at low temperatures 35 or do not show the unique properties of multipolar lasing in coupled corner modes with different field profiles and Q factors 35,36 .…”

Section: Discussionmentioning

confidence: 96%

“…Very recently, lasing in a single corner has been reported for similar nanopatterned structures 35,36 . Those corner lasers, however, operate at low temperatures 35 or do not show the unique properties of multipolar lasing in coupled corner modes with different field profiles and Q factors 35,36 . In this work, we have conclusively demonstrated the stable multipole corner modes with antinode intensities at two or four corners as a result of coupling between the corners.…”

Section: Discussionmentioning

confidence: 96%

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Multipolar lasing modes from topological corner states

et al. 2020

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Topological photonics provides a fundamental framework for robust manipulation of light, including directional transport and localization with built-in immunity to disorder. Combined with an optical gain, active topological cavities hold special promise for a design of light-emitting devices. Most studies to date have focused on lasing at topological edges of finite systems or domain walls. Recently discovered higher-order topological phases enable strong high-quality confinement of light at the corners. Here, we demonstrate lasing action of corner states in nanophotonic topological structures. We identify several multipole corner modes with distinct emission profiles via hyperspectral imaging and discern signatures of non-Hermitian radiative coupling of leaky topological states. In addition, depending on the pump position in a large-size cavity, we generate selectively lasing from either edge or corner states within the topological bandgap. Our studies provide the direct observation of multipolar lasing and engineered collective resonances in active topological nanostructures.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 96%

Multipolar lasing modes from topological corner states

et al. 2020

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“…On the other hand, the coupled higher-order topological modes can be a useful starting point for higher-order non-Hermitian physics [27,28]. They may also find applications such as topological wave and light confinement [13,29] and topological lasing [30,31].…”

Section: Discussionmentioning

confidence: 99%

Measurement of Corner-Mode Coupling in Acoustic Higher-Order Topological Insulators

Zhang

et al. 2021

Front. Phys.

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Recent developments of band topology have revealed a variety of higher-order topological insulators (HOTIs). These HOTIs are characterized by a variety of different topological invariants, making them different at a fundamental level. However, despite such differences, the fact that they all sustain higher-order topological boundary modes poses a challenge to phenomenologically tell them apart. This work presents experimental measurements of the coupling effects of topological corner modes (TCMs) existing in two different types of two-dimensional acoustic HOTIs. Although both HOTIs have a similar four-site square lattice, the difference in magnetic flux per unit cell dictates that they belong to different types of topologically nontrivial phases—one lattice possesses quantized dipole moments, but the other is characterized by quantized quadrupole moment. A link between the topological invariants and the response line shape of the coupled TCMs is theoretically established and experimentally confirmed. Our results offer a pathway to distinguish HOTIs experimentally.

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“…Despite a number of promising preliminary theoretical considerations 6,22,23 , several experimental studies in dissipative HOTI systems [24][25][26] , as well as the recently demonstrated potential of harnessing tightly localized HOTI corner states for the enhancement of nonlinear processes such as third-harmonic generation 27 , there is only one experimental study at hand, where the evidence of switching into the HOTI phase under the nonlinear action of a homogeneous global pump was reported in electronic circuits 5 . Importantly, to date, research into the wave dynamics of photonic HOTIs in conservative optical systems has been confined to strictly linear conditions, and their extension in the presence of nonlinear self-action has yet to be explored.…”

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confidence: 99%

Nonlinear second-order photonic topological insulators

et al. 2021

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Higher-order topological insulators are a novel topological phase beyond the framework of conventional bulk–boundary correspondence1,2. In these peculiar systems, the topologically non-trivial boundary modes are characterized by a co-dimension of at least two3,4. Despite several promising preliminary considerations regarding the impact of nonlinearity in such systems5,6, the flourishing field of experimental higher-order topological insulator research has thus far been confined to the linear evolution of topological states. As such, the observation of the interplay between nonlinearity and the dynamics of higher-order topological phases in conservative systems remains elusive. Here we experimentally demonstrate nonlinear higher-order topological corner states. Our photonic platform enables us to observe nonlinear topological corner states as well as the formation of solitons in such topological structures. Our work paves the way towards the exploration of topological properties of matter in the nonlinear regime, and may herald a new class of compact devices that harnesses the intriguing features of topology in an on-demand fashion.

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Lasing at Multidimensional Topological States in a Two-Dimensional Photonic Crystal Structure

Cited by 72 publications

References 51 publications

Multipolar lasing modes from topological corner states

Multipolar lasing modes from topological corner states

Measurement of Corner-Mode Coupling in Acoustic Higher-Order Topological Insulators

Nonlinear second-order photonic topological insulators

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