Wideband trapping of light by edge states in honeycomb photonic crystals

Ouyang, Chunfang; Han, Dezhuan; Zhao, Fangyuan; Hu, Xinhua; Liu, Xiaohan; Zi, Jian

doi:10.1088/0953-8984/24/49/492203

Cited by 6 publications

(4 citation statements)

References 36 publications

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“…It is worth to note that the physical mechanism shown in Fig. 2c is different from those of the previously proposed reciprocal structures 7 8 9 10 11 12 13 14 15 . Firstly, this nonreciprocal structure has a one-way region ( x < x c 1 ) which can prevent the wave propagating in − x direction.…”

Section: Physical Mechanismmentioning

confidence: 57%

“…It aims to trap different frequency components of the wave packet at different positions in space permanently 7 . Various waveguide structures are proposed to achieve the trapped rainbow effect, such as tapered waveguides made by negative or hyperbolic metamaterials 7 8 9 , tapered plasmonic waveguides 10 11 , and tapered photonic crystal waveguides 12 . Some experiments have also been conducted 13 14 15 .…”

mentioning

confidence: 99%

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Truly trapped rainbow by utilizing nonreciprocal waveguides

Liu

2016

Sci Rep

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The concept of a “trapped rainbow” has generated considerable interest for optical data storage and processing. It aims to trap different frequency components of the wave packet at different positions permanently. However, all the previously proposed structures cannot truly achieve this effect, due to the difficulties in suppressing the reflection caused by strong intermodal coupling and distinguishing different frequency components simultaneously. In this article, we found a physical mechanism to achieve a truly “trapped rainbow” storage of electromagnetic wave. We utilize nonreciprocal waveguides under a tapered magnetic field to achieve this and such a trapping effect is stable even under fabrication disorders. We also observe hot spots and relatively long duration time of the trapped wave around critical positions through frequency domain and time domain simulations. The physical mechanism we found has a variety of potential applications ranging from wave harvesting and storage to nonlinearity enhancement.

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Section: Physical Mechanismmentioning

confidence: 57%

mentioning

confidence: 99%

Truly trapped rainbow by utilizing nonreciprocal waveguides

Liu

2016

Sci Rep

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“…The purpose of trapping rainbow is to trap different frequency components of incident light or electromagnetic (EM) waves at different spatial positions [16]. So far, it has been numerically studied in tapered structures such as tapered waveguide based on metamaterial [17,18], tapered photonic crystal waveguides [19], or tapered plasmonic waveguides [20]. It should be mentioned that the incident EM waves in these systems are strongly reflected due to the strong coupling between the forward and backward modes near the critical position [21].…”

Section: Introductionmentioning

confidence: 99%

Trapping a magnetic rainbow by using a one-way magnetostatic-like mode

Shen

Min

et al. 2019

Opt. Mater. Express

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Trapped rainbow effects have been realized in many systems while they are all characterized by electric-field enhancement. The trapped rainbow with strong magnetic-field enhancement has yet to be studied. Here, we achieve the trapped magnetic rainbow effect in a novel metal-air-YIG (yttrium-iron-garnet)-metal (MAYM) waveguide applied with a continuously decreasing magnetic field. The proposed system supports a one-way propagation feature, leading to the suppressed reflection. We systemically analyze the dispersion and the modal properties, showing the transition from the SMP (surface magnetoplasmon)-like mode to magnetostatic-like mode and the change of the group velocity when decreasing the external magnetic field along the propagation direction of the wave. We obtain the trapped magnetic rainbow effects as well as magnetic hotspots both in frequency-and time-domain simulations. The trapped rainbow effect with strong magnetic field enhancement paves a promising way for many applications including magnetic sensing to magnetic non-linearity.

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“…In the past decades, a lot of attention has been focused on slow light and its applications such as optical information processing 1 2 3 4 5 6 7 8 9 . One possible route to realize slow light is the creation of flat bands in photonic crystals 2 3 4 5 6 7 8 9 10 11 12 13 14 15 , which exhibit dramatically small group velocities and high density of states (DOS), and thus provide an efficient method to slow down and control photons. In the typical band structures of photonic crystals, flat bands usually only appear in a small region in k -space, such as the Brillouin zone edge or center 16 17 18 19 20 21 22 23 .…”

mentioning

confidence: 99%

Design of full-k-space flat bands in photonic crystals beyond the tight-binding picture

Wang

Hang

et al. 2015

Sci Rep

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Based on a band engineering method, we propose a theoretical prescription to create a full-k-space flat band in dielectric photonic crystals covering the whole Brillouin Zone. With wave functions distributed in air instead of in the dielectrics, such a flat band represents a unique mechanism for achieving flat dispersions beyond the tight-binding picture, which can enormously reduce the requirement of permittivity contrast in the system. Finally, we propose and numerically demonstrate a unique application based on the full-k-space coverage of the flat band: ultra-sensitive detection of small scatterers.

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Wideband trapping of light by edge states in honeycomb photonic crystals

Cited by 6 publications

References 36 publications

Truly trapped rainbow by utilizing nonreciprocal waveguides

Truly trapped rainbow by utilizing nonreciprocal waveguides

Trapping a magnetic rainbow by using a one-way magnetostatic-like mode

Design of full-k-space flat bands in photonic crystals beyond the tight-binding picture

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