Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

Zhou, Xin; Leykam, Daniel; Chattopadhyay, Udvas; Khanikaev, Alexander B.; Chong, Yidong

doi:10.1103/physrevb.98.205115

Cited by 13 publications

(8 citation statements)

References 37 publications

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“…We confirm the existence of valley states at one corner of the Brillouin zone but not the other, by direct field mapping of the microwaves refracting into an empty waveguide, as well as non-reciprocal reflection from the surface of the PhC. This work opens up multiple avenues for explorations and applications of the unpaired Dirac point, including one-way Klein tunneling 39 , implementation of magneto-optical near-zero refractive index media 41 , and manipulation of valley states for robust bulk transport 28 .…”

Section: Resultssupporting

confidence: 63%

“…4(b). The wave with incidence angle  near-zero refractive index media 41 , and manipulation of valley states for robust bulk transport 28 .…”

Section: The Effective Hamiltonian Governing the Second And Third Tm mentioning

confidence: 99%

“…Finally, we demonstrate the phenomenon of non-reciprocal reflection, where microwave beams incident from different directions outside the PhC is selectively reflected, depending on the availability of an unpaired Dirac point within the PhC to couple to. The realization of an unpaired photonic Dirac point in a PhC setting opens up many other possibilities for exploring the behavior and applications of 2D Dirac modes, including one-way Klein tunneling 39 , weak antilocalization 31,40 , and enhancement of magneto-optical activity by near-zero effective refractive indices 41 .…”

Section: Introductionmentioning

confidence: 99%

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Observation of an unpaired photonic Dirac point

et al. 2020

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At photonic Dirac points, electromagnetic waves are governed by the same equations as twocomponent massless relativistic fermions. However, photonic Dirac points are known to occur in pairs in "photonic graphene" and other similar photonic crystals, which necessitates special precautions to excite only states near one of the Dirac points. Systems hosting unpaired photonic Dirac points are significantly harder to realize, as they require broken time-reversal symmetry.Here, we report on the first observation of an unpaired Dirac point in a planar two-dimensional photonic crystal. The structure incorporates gyromagnetic materials, which break time-reversal symmetry; the unpaired Dirac point occurs when a parity-breaking parameter is fine-tuned to a topological transition between a photonic Chern insulator and a conventional photonic insulator phase. Evidence for the unpaired Dirac point is provided by transmission and field-mapping experiments, including a demonstration of strongly non-reciprocal reflection. This photonic crystal is suitable for investigating the unique features of two-dimensional Dirac states, such as one-way Klein tunneling.

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Section: Resultssupporting

confidence: 63%

“…4(b). The wave with incidence angle  near-zero refractive index media 41 , and manipulation of valley states for robust bulk transport 28 .…”

Section: The Effective Hamiltonian Governing the Second And Third Tm mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation of an unpaired photonic Dirac point

et al. 2020

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“…[ 27,95,96 ] At the phase transition point, the system hosts a single Dirac cone, which exhibits unusual features, such as weak antilocalization, [ 97 ] one‐way Klein tunneling, [ 27 ] and zero‐index behavior (only when the Dirac cone sits at Brillouin zone center). [ 98 ]…”

Section: T ‐Broken Valley Physicsmentioning

confidence: 99%

Topological Valley Photonics: Physics and Device Applications

Xue

Yang

Baile

2021

Advanced Photonics Research

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Topological photonics has emerged as a promising field in photonics that is able to shape the science and technology of light. As a significant degree of freedom, valley is introduced to design and construct photonic topological phases, with encouraging recent progress in applications ranging from on‐chip communications to terahertz lasers. Herein, the development of topological valley photonics is reviewed, from both perspectives of fundamental physics and practical applications. The unique valley‐contrasting physics determines that the bulk topology and the bulk‐boundary correspondence in valley photonic topological phases exhibit different properties from other photonic topological phases. Valley conservation allows not only robust propagation of light through sharp corners, but also 100% out‐coupling of topological states to the surrounding environment. Finally, robust valley transport requires no magnetic materials or the complex construction of photonic pseudospin and, thus, can be integrated on compact photonic platforms for future technologies.

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“…One major limitation, which was identified in this work and should be further investigated in the future, is the need to tailor the time of flight in the nonlinear SSH and Haldane topological isolators; i.e., the need to choose the input/output ports and propagation distances carefully, which reduces design flexibility. Another problem is that in the nonlinear SSH and coupled ring resonator isolators, asymmetry is introduced by adding input and output losses, which reduces the efficiency of the device.Realization of magneto-optical near-zero index medium by an unpaired Dirac pointMost of the material presented in this chapter was previously published in the journal Physical Review B[158]. Wherever figures and materials from other sources have been taken; the authors have been given due credit.…”

mentioning

confidence: 99%

Two kinds of phase transition in photonic systems with application to optical isolation

Zhou¹

Self Cite

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This thesis contains material from 3 papers published in the following peer-reviewed journalsin which I am listed as an author. Chapter 2 is published as Xin Zhou, and Yidong Chong. "PT symmetry breaking and nonlinear optical isolation in coupled microcavities." Optics Express 24.7 (2016): 6916-6930. The contributions of the co-authors are as follows: • Yidong Chong conceived the idea. • I performed the theoretical investigations and simulations, supervised by Yidong Chong.

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Realization of a magneto-optical near-zero index medium by an unpaired Dirac point

Cited by 13 publications

References 37 publications

Observation of an unpaired photonic Dirac point

Observation of an unpaired photonic Dirac point

Topological Valley Photonics: Physics and Device Applications

Two kinds of phase transition in photonic systems with application to optical isolation

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