Orbital angular momentum microlaser

Miao, Pei; Zhang, Zhifeng; Sun, Jingbo; Walasik, Wiktor; Longhi, Stefano; Litchinitser, Natalia M.; Feng, Liang

doi:10.1126/science.aaf8533

Cited by 589 publications

(357 citation statements)

References 33 publications

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“…In one approach, ultra-compact siliconintegrated optical vortex emitters, whichrely on whispering gallery modes of a circular resonator,weredemonstrated to emit abeam with well-controlled amounts of OAM into free space ( figure 16(A)) [111]. Very recently, a microring laser producingsingle-mode OAM vortex lasing with the ability to precisely define the topological charge of the OAM mode was reported ( figure 16(B)) [112].…”

Section: Current and Future Challengesmentioning

confidence: 99%

Roadmap on structured light

Rubinsztein‐Dunlop

Forbes

Berry

et al. 2016

J. Opt.

1,131

630

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Structured light refers to the generation and application of custom light fields. As the tools and technology to create and detect structured light have evolved, steadily the applications have begun to emerge. This roadmap touches on the key fields within structured light from the perspective of experts in those areas, providing insight into the current state and the challenges their respective fields face. Collectively the roadmap outlines the venerable nature of structured light research and the exciting prospects for the future that are yet to be realized.

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Section: Current and Future Challengesmentioning

confidence: 99%

Roadmap on structured light

Rubinsztein‐Dunlop

Forbes

Berry

et al. 2016

J. Opt.

1,131

630

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show abstract

“…For instance, a grating of wide metallic strips periodically loaded with lumped elements has been proposed to design the metasurfaces with gain for microwave cloaking [50]. In addition, subwavelength structures with a large amount of gain can be realized by using multilayered structures [48], microwave and optical metastructures with gain [71][72][73][74][75], etc. In particular, the effective gain media with pure permittivity or permeability have also been demonstrated in core-shell composites [76].…”

Section: (C)mentioning

confidence: 99%

Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

Luo

Lai

2018

Phys. Rev. X

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Impurities usually play an important role in modifying the bulk properties of electronic or electromagnetic materials. In this work, we demonstrate a way to break this discipline and realize the extraordinary physical property of impurity-immunity, which leads to perfect transmission irrespective of embedded impurities of almost any material and shape. This extraordinary property comes from the exceptional points of a pair of parity-time (PT)-symmetric metasurfaces sandwiching a slab of epsilonnear-zero medium. By systematically investigating the PT-symmetric metasurfaces sandwiching a slab of dielectrics or metamaterials, we obtain the two complementary solutions of exceptional points corresponding to perfect transmission. Interestingly, when the permittivity of the slab approaches zero, the two solutions of exceptional points coalesce into one exceptional point. At such a critical point, we find that the original "doping" effect of impurities in epsilon-near-zero media, proposed by Nader Engheta's group very recently [I. Liberal et al., Science 355, 1058(2017], is significantly suppressed. Our work shows that exceptional points can be used to eliminate scattering of impurities in a bulk medium.

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“…Moreover, PT symmetric band structures can exhibit non-Hermitian degeneracies known as exceptional points (EPs), where a pair of eigenstates coalesce and the Hamiltonian becomes defective [22][23][24][25][26][27] . EPs can give rise to a wide variety of interesting phenomena, including unidirectional invisibility, chiral lasing, and enhanced spontaneous emission [28][29][30][31][32] . An important question is whether the existence of flat bands is compatible with non-Hermiticity, and if so whether the presence of EPs might alter the behavior of the flat band states.…”

Section: Introductionmentioning

confidence: 99%

Flat bands in lattices with non-Hermitian coupling

2017

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We study non-Hermitian photonic lattices that exhibit competition between conservative and non-Hermitian (gain/loss) couplings. A bipartite sublattice symmetry enforces the existence of non-Hermitian flat bands, which are typically embedded in an auxiliary dispersive band and give rise to non-diffracting "compact localized states". Band crossings take the form of non-Hermitian degeneracies known as exceptional points. Excitations of the lattice can produce either diffracting or amplifying behaviors. If the non-Hermitian coupling is fine-tuned to generate an effective π flux, the lattice spectrum becomes completely flat, a non-Hermitian analogue of Aharonov-Bohm caging in which the magnetic field is replaced by balanced gain and loss. When the effective flux is zero, the non-Hermitian band crossing points give rise to asymmetric diffraction and anomalous linear amplification.

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Orbital angular momentum microlaser

Cited by 589 publications

References 33 publications

Roadmap on structured light

Roadmap on structured light

Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

Flat bands in lattices with non-Hermitian coupling

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