Determination of Zak phase by reflection phase in 1D photonic crystals

Gao, Wensheng; Xiao, Meng; Chan, Che Ting; Tam, Wing Yim

doi:10.1364/ol.40.005259

Cited by 88 publications

(43 citation statements)

References 14 publications

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“…In our experiment, one unit cell of Type I photonic crystals with the inversion center chosen at the low refractive index material, i.e. PC_A, PC_B, and PC_C, contains two half layers of [17].…”

Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

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Controlling interface states in 1D photonic crystals by tuning bulk geometric phases

et al. 2017

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There is no known simple rule that assures the existence of interface states in photonic crystals (PCs). We show here that one can control the existence or absence of interface states in 1D PCs through engineering the bulk geometrical phase such that interface states can be guaranteed in some or all photonic bandgaps. We verify experimentally the interface state design paradigm in 1D multilayered PCs fabricated by electron beam vapor deposition. We obtain the geometrical phases by measuring the reflection phases at the bandgaps of the PCs and achieve good agreement with the theory. Our approach could provide a platform for generating a PC interface state for various applications.

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Section: Sample Fabrication and Characterizationmentioning

confidence: 99%

“…We followed the same procedures as reported earlier, using a thick-gap Fabry-Perot technique, to determine the reflection phases, and hence the Zak phases, of the PCs [16,17]. To measure the reflection phase we placed a thick (~1cm) optically flat glass at ~10-20m above the PC to form an air-gap Fabry-Perot etalon.…”

Section: Determination Of Reflection Phasementioning

confidence: 99%

Controlling interface states in 1D photonic crystals by tuning bulk geometric phases

et al. 2017

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“…Tamm plasmons are surface states that can exist on the interface between the metal surface and a dielectric Bragg mirror (i.e., a one-dimensional photonic crystal). The existence of Tamm plasmon states is protected by the topological propertiesmanifested as geometrical Zak phasesof the optical bands of the photonic crystal [33][34][35][36] rather than by the Jordan's theorem as for the effective-index-matched thin films. The Tamm plasmon sensors can be easily designed to operate at a chosen frequency (or multiple frequencies), can be composed of a variety of plasmonic and dielectric materials, are amenable to fast and large-scale fabrication by either sputtering of vapor deposition techniques, and have high tolerance to fabrication imperfections [22,37].…”

Section: Introductionmentioning

confidence: 99%

Sensitive singular-phase optical detection without phase measurements with Tamm plasmons

Boriskina

Tsurimaki

2018

J. Phys.: Condens. Matter

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Spectrally-tailored interactions of light with material interfaces offer many exciting applications in sensing, photo-detection, and optical energy conversion. In particular, complete suppression of light reflectance at select frequencies accompanied by sharp phase variations in the reflected signal forms the basis for the development of ultra-sensitive singular-phase optical detection schemes such as Brewster and surface plasmon interferometry. However, both the Brewster effect and surface-plasmon-mediated absorption on planar interfaces are limited to one polarization of the incident light and oblique excitation angles, and may have limited bandwidth dictated by the material dielectric index and plasma frequency. To alleviate these limitations, we design narrow-band super-absorbers composed of plasmonic materials embedded into dielectric photonic nanostructures with topologically-protected interfacial Tamm plasmon states. These structures have planar geometry and do not require nanopatterning to achieve perfect absorption of both polarizations of the incident light in a wide range of incident angles, including the normal incidence. Their absorption lines are tunable across a very broad spectral range via engineering of the photon bandstructure of the dielectric photonic nanostructures to achieve reversal of the geometrical phase across the interface with the plasmonic absorber. We outline the design strategy to achieve perfect absorptance in Tamm structures with dissipative losses via conjugate impedance matching. We further demonstrate via modeling how these structures can be engineered to support sharp asymmetric amplitude resonances, which can be used to improve the sensitivity of optical sensors in the amplitude-only detection scheme that does not require use of bulky and expensive ellipsometry equipment.

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“…Topologically protected edge states in photonic crystals show great potential for applications in the fields of integrated photonic circuits and ultrahigh‐speed information processing chips owing to their unique properties including the elimination of backscattering and immunity to structural disorder. Various approaches have been proposed to demonstrate topological edge modes in photonic crystals, such as the use of 1D dielectric photonic crystals, 1D lattices of evanescently coupled optical waveguide, diatomic chains of nanoparticles, 2D photonic crystals composed of ferromagnetic garnet rods or high‐dielectric cylinders, honeycomb photonic lattices, photonic crystals (PCs) with C 6 v symmetry, and 3D gyroid photonic crystals . The topological edge state (TES) plays a key role in the study of topological physics for bulk‐edge correspondence.…”

Section: Introductionmentioning

confidence: 99%

“…Chan et al first used the Zak phase to predict the photonic TES in the 1D PC heterostructure system. The method they proposed was convenient for designing a TES in different bandgaps of the 1D PC heterostructure . The edge local TES can induce photons to transmit through the PCs at frequencies in the bandgap, which offers a new way to control photon transportation.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐optical Tunable Ultracompact Chip‐Integrated 1D Photonic Topological Insulator

Gao

et al. 2017

Advanced Optical Materials

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study of topological physics for bulk-edge correspondence. It is difficult to directly observe the topological properties of the bulk band, but instead one can explore it by probing the TES. [28][29][30] Although the topological edge state in 2D-and 3D-topological systems can transport unidirectionally, this requires complex design and fabrication processes; hence, very few of these structures have an experimentally observed TES at optical or communication frequencies. [30,31] Chan [1] et al. first used the Zak phase [32] to predict the photonic TES in the 1D PC heterostructure system. The method they proposed was convenient for designing a TES in different bandgaps of the 1D PC heterostructure. [2,4,5] The edge local TES can induce photons to transmit through the PCs at frequencies in the bandgap, which offers a new way to control photon transportation. However, the use of a PC heterostructure to control photon transportation in 1D PCs means that the light should propagate normal to the films, which is unsuitable for integrated photonic circuits.To extend applications of photonic topology in integrated photonic circuits, we propose the use of 1D-grating heterostructures to generate topological edge states. The grating resembles the 1D PC according to the similarity of the Bragg scattering effect when photons propagate along lattice periods. The 1D-grating heterostructure has advantages in terms of both ease of design and the relatively simple fabrication processes compared with those for 2D-and 3D-topological systems. Furthermore, the film-parallel transportation, communication wavelength range design and the compact size might allow for practical integration of 1D photonic topology with on-chip platforms. We first designed grating heterostructures from a 1D PC heterostructure and showed their similarity and the feasibility of constructing a TES in the grating heterostructure. We then fabricated the Si/SiO 2 grating heterostructure to verify the TES transmission peak in an experiment. Finally, we realized a thermally tunable topological grating heterostructure with a metalinsulator transition material vanadium dioxide (VO 2 ), enabling control of the TES and photon propagation in the bandgap. From 1D PC to GratingWe start from the TES in a two joint 1D-perfect photonic crystal and then show that the grating structures on the chip An on-chip integrated one-dimension topological insulator in the optical communication range is realized directly in an integrated photonic circuit. The system takes on a configuration of a 220 nm thick 1D photonic crystal heterostructure sandwiched between two gold films. A photonic topological edge state centered at 1550 nm is obtained for the chip-integrated onedimension topological insulator made of a silicon/SiO 2 photonic crystal heterostructure with a feature size of only 2.25 µm integrated with a silicon waveguide. On/off switching of the photonic topological edge state was also achieved in a 1D topological insulator made of a VO 2 /SiO 2 photonic crystal heterostructure based o...

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Determination of Zak phase by reflection phase in 1D photonic crystals

Cited by 88 publications

References 14 publications

Controlling interface states in 1D photonic crystals by tuning bulk geometric phases

Controlling interface states in 1D photonic crystals by tuning bulk geometric phases

Sensitive singular-phase optical detection without phase measurements with Tamm plasmons

Thermo‐optical Tunable Ultracompact Chip‐Integrated 1D Photonic Topological Insulator

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