One-dimensional photonic crystals bound by light

Cui, Liyong; Xiao, Lin; Chen, Jun; Cao, Yongyin; Du, Guiqiang; Ng, Jack

doi:10.1103/physreva.96.023833

Cited by 11 publications

(6 citation statements)

References 35 publications

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“…However, these maxima in the histogram are slightly shifted to smaller interparticle spacing corresponding to the Bragg condition in the effective medium having its refractive index slightly higher due to presence of neighboring particles. Thus, the quasi-periodic CW structure effectively acts as a weak photonic crystal (PC), enhancing the scattering of light with wavelength commensurate with the lattice constant of the structure. − Indeed, the simulated CW transmission curve shown in Figure c reveals small local maxima of T CW superimposed on a slowly varying background that arises from the changes of the effective refractive index. These discrete transmission peaks are separated by Δ z Bragg and originate from constructive interference of light scattered from the CW structure.…”

Section: Resultsmentioning

confidence: 99%

Tunable Soft-Matter Optofluidic Waveguides Assembled by Light

et al. 2019

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Development of artificial materials exhibiting unusual optical properties is one of the major strands of current photonics research. Of particular interest are softmatter systems reconfigurable by external stimuli that play an important role in research fields ranging from physics to chemistry and life sciences. Here, we prepare and study unconventional self-assembled colloidal optical waveguides (CWs) created from wavelength-size dielectric particles held together by long-range optical forces. We demonstrate robust nonlinear optical properties of these CWs that lead to optical transformation characteristics remarkably similar to those of gradient refractive index materials and enable reversible all-optical tuning of light propagation through the CW. Moreover, we characterize strong optomechanical interactions responsible for the CW self-assembly; in particular, we report self-sustained oscillations of the whole CW structure tuned so that the wavelength of the laser beams forming the CW is not allowed to propagate through. The observed significant coupling between the mechanical motion of the CW and the intensity of light transmitted through the CW can form a base for designing novel mesoscopic-scale photonic devices that are reconfigurable by light.

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Section: Resultsmentioning

confidence: 99%

Tunable Soft-Matter Optofluidic Waveguides Assembled by Light

et al. 2019

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“…By using the finite difference method, the OFSM ↔ K is calculated [42][43][44][45][46], and the corresponding eigenvalues λ ± against the particle radius is plotted in figure 2(a). The particle used here is a polystyrene sphere with refractive index n = 1.57.…”

Section: Sorting Of Particles With Subtle Difference In Their Radiimentioning

confidence: 99%

“…This non-Hermiticity can be manifested by the non-Hermitian optical force stiffness matrix (OFSM), which act as the Hamiltonian governing the particle motion in a dampingless environment within an optical field. Prior studies have investigated the stability of particle trapping and binding in various optical fields by analyzing the eigenvalues of the OFSM [28,[42][43][44][45][46]. However, there is limited research focused on the motion of particle in a damping environment when the eigenvalues become complex.…”

Section: Introductionmentioning

confidence: 99%

Optical sorting by trajectory tracking with high sensitivity near the exceptional points

Cui,

Liu,

Wang

2023

New J. Phys.

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Exceptional points (EPs) in non-Hermitian systems embody abundant new physics and trigger various novel applications. In the optical force system, the motion of a particle near its equilibrium position is determined by the optical force stiffness matrix (OFSM), which is inherently non-Hermitian when the particle is illuminated by vortex beams. In this study, by exploiting the rapid variations in eigenvalues and the characteristics of particle motion near EPs of the OFSM, we propose a method to sort particles with subtle differences in their radii or refractive indices based on their trajectories in air. We demonstrate that the trajectory of a particle with parameters slightly larger than those corresponding to certain EPs closely resembles an ellipse. The increase in the major axis of the ellipse can be several orders of magnitude larger than the increase in particle radius. Furthermore, even a slight change in the refractive index can not only significantly alter the size of the ellipse but also rotate its orientation angle. Hence, particles with subtle differences can be distinguished by observing the significant disparities in their trajectories. This approach holds promise as a technique for the precise separation of micro and nanoscale particles.

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“…It is a natural question to ask whether one could manipulate Ω + by changing J p laser [4,17,18,54] based on XFEL parameter [49]. In Fig.…”

Section: Transition Induced By Xfel Jp Laser Parametersmentioning

confidence: 99%

“…More recently, the development of a free electron laser (FEL) [12] has lead to further advancements, such as the observation of EUV-FEL-induced SF in Helium gas [13], XUV-FEL-induced SF in Xenon gas [14] and FEL superfluorescence [15]. Apart from typical three-level-Λ type atomic systems [6,13,[16][17][18], a V-type one [19,20] has also been theoretically investigated.…”

Section: Introductionmentioning

confidence: 99%

Transition between amplified spontaneous emission and superfluorescence in a longitudinally pumped medium by an x-ray free-electron-laser pulse

Kuan

Liao

2020

Phys. Rev. A

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The transition from the amplification of spontaneous emission to superfluorescence in a three-level and sweptgain medium excited by an X-ray free electron laser pulse is theoretically investigated. Given the specific time scale of X-ray free electron laser pulse, we investigate the swept pumping process in detail and our results show that the temporal structure of an X-ray free electron laser pulse plays a more critical role than its peak intensity does for producing population inversion. The typical watershed of two radiant regions depends on the optical depth of the gain medium for a given coherence time, namely, particle number density and the medium length are equally important. However, we find that medium length plays more important role than particle density does for making the forward-backward asymmetry. The transient gain length and the total medium length are identified as two important factors to observe length induced backward transition. The present results suggest an application of parametric controls over a single-pass-amplified light source.

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One-dimensional photonic crystals bound by light

Cited by 11 publications

References 35 publications

Tunable Soft-Matter Optofluidic Waveguides Assembled by Light

Tunable Soft-Matter Optofluidic Waveguides Assembled by Light

Optical sorting by trajectory tracking with high sensitivity near the exceptional points

Transition between amplified spontaneous emission and superfluorescence in a longitudinally pumped medium by an x-ray free-electron-laser pulse

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