Adiabatic elimination-based coupling control in densely packed subwavelength waveguides

Mrejen, Michael; Suchowski, Haim; Hatakeyama, Taiki; Wu, Chihhui; Feng, Liang; O’Brien, Kevin; Wang, Yuan; Zhang, Xiang

doi:10.1038/ncomms8565

Cited by 89 publications

(61 citation statements)

References 41 publications

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“…Furthermore, it is shown that STIRAP is exceedingly robust against controlling parameters under perturbations. The SITRAP has already been widely used in various domains, such as atomic molecular and optical physics [27,28], waveguide coupler [29,30], graphene electronic and optical effect [24,31].…”

Section: Introductionmentioning

confidence: 99%

Robust and broadband integrated terahertz coupler conducted with adiabatic following

et al. 2019

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As the key concept in fabricating integrated device, surface plasmon-polaritons (SPPs) have been widely employed to artificially manipulate the electromagnetic waves in metallic surfaces. However, due to the highly structure-dependent resonance of SPPs, it is challengeable to develop a fixed device which can function at wide band. Here, we propose a novel broadband and robust SPPs directional coupler based on the tri-layered curved waveguides working at terahertz (THz) frequencies, where the coupling of SPPs between the adjacent waveguides can be modeled with coupled mode theory. By introducing the stimulated raman adiabatic passage quantum control technique, we achieve the complete transfer of SPPs from the input to the output waveguides in the range of 0.9-1.3 THz, and even considering the propagation loss, the transfer rate is still above 70%. Furthermore, the performance of our device is eminently robust because of its insensitivity to the geometry of structure and the wavelength of SPPs. As a result, our device can tolerate defect induced by fabrication processing and manipulate THz waves at broadband. This finding provides a new theoretical guideline in promoting THz on-demand applications, which is of significance in developing integrated THz devices.

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Section: Introductionmentioning

confidence: 99%

Robust and broadband integrated terahertz coupler conducted with adiabatic following

et al. 2019

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“…Consider the ‘hiding’ (or ‘decoupling’) of some elements inside densely packed coupled optical systems 5, 7–11 . Transformation optics in this scenario provides the severely intricate solution even for the approximated case 12 : the coating of target elements with spatially-varying, highly anisotropic metamaterials of extreme material parameters (effective permittivity ~0), which derives the ‘microscopic’ removal of the coupling to the target elements.…”

Section: Introductionmentioning

confidence: 99%

Target decoupling in coupled systems resistant to random perturbation

Piao

Park

2017

Sci Rep

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To suppress unwanted crosstalks between nearby optical elements, the decoupling technique for integrated systems has been desired for the target control of light flows. Although cloaking methods have enabled complete decoupling of optical elements by manipulating electromagnetic waves microscopically, it is difficult to be applied rigorously to control each unit element in coupled systems due to severe restrictions on material parameters for cloaking. Here we develop the macroscopic approach to design crosstalk-free regions in coupled optical systems. By inversely designing the eigenstate which encompasses target elements, the stable decoupling of the elements from the coupled system is achieved, being completely independent from the random alteration of the decoupled region, and at the same time, allowing coherent and scattering-free wave transport with desired spatial profiles. We also demonstrate the decoupling in disordered systems, overcoming the transport blockade from Anderson localization. Our results provide an attractive solution for “target hiding” of elements inside coupled systems.

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“…The wave propagation direction along a chain of plasmonic particles with tightly localized photonic modes is determined by the sign of the coupling factor, which stems from the overlap of the evanescent tails of tight‐binding photonic modes. Although the coupling strength can be easily tuned by adjusting the interparticle distance, it remains difficult to flip the sign of coupling factor and consequently switch between forward and backward wave propagations.…”

mentioning

confidence: 99%

Forward/Backward Switching of Plasmonic Wave Propagation Using Sign‐Reversal Coupling

Gao

Zhang

et al. 2017

Advanced Materials

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Backward waves with wave-front propagation opposite in direction to that of energy flow have attracted considerable interest in the context of photonic metamaterials. However, switching between forward and backward waves in the same frequency range has remained a challenge. Here, on a platform of coupled designer surface plasmon resonators in the microwave regime, multiband forward/backward switching of plasmonic wave propagation is demonstrated. This approach makes use of sign-reversal coupling that occurs when switching the coupling configuration between tightly confined photonic modes. Direct experimental measurements of plasmon dispersion curves confirm the forward/backward propagation of plasmonic waves in the same frequency range. This study provides a solution to forward/backward switching of subwavelength plasmonic wave propagation, and may find potential applications in photonic integrated systems.

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Adiabatic elimination-based coupling control in densely packed subwavelength waveguides

Cited by 89 publications

References 41 publications

Robust and broadband integrated terahertz coupler conducted with adiabatic following

Robust and broadband integrated terahertz coupler conducted with adiabatic following

Target decoupling in coupled systems resistant to random perturbation

Forward/Backward Switching of Plasmonic Wave Propagation Using Sign‐Reversal Coupling

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