Tunable spatial mode converters and optical diodes for graphene parallel plate waveguides

Nezhad, Vahid Foroughi; Haddadpour, Ali; Veronis, Georgios

doi:10.1364/oe.24.023883

Cited by 12 publications

(7 citation statements)

References 53 publications

(71 reference statements)

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“…Besides, tunable mode conversion of plasmonic modes is also investigated. 22) In this paper, we have proposed a simple metallic structure, which is composed of the bus waveguides and a shifted cavity, to achieve the mode conversion between s-and a-mode. Parameters (the length L) of the shifted cavity are carefully to be chosen to select the objective mode.…”

mentioning

confidence: 99%

Mode conversion in metal–insulator–metal waveguide with a shifted cavity

Wang

Yan

2017

Jpn. J. Appl. Phys.

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We propose a method, which is utilized to achieve the plasmonic mode conversion in metal-insulator-metal (MIM) waveguide, theoretically. Our proposed structure is composed of bus waveguides and a shifted cavity. The shifted cavity can choose out a plasmonic mode (a-or s-mode) when it is in Fabry-Perot (FP) resonance. The length of the shifted cavity L is carefully chosen, and our structure can achieve the mode conversion between a-and s-mode in the communication region. Besides, our proposed structure can also achieve plasmonic mode-division multiplexing. All the numerical simulations are carried on by the finite element method to verify our design.

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confidence: 99%

Mode conversion in metal–insulator–metal waveguide with a shifted cavity

Wang

Yan

2017

Jpn. J. Appl. Phys.

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“…Different from the idea proposed by Zhang et al [22], our structure is in planar geometry and involves fewer parameters, thus it may be easier for fabrication and practical usage. In addition, it is easy to realize an optical diode with our structure at different wavelengths by adjusting the parameters, which is different from those methods previously published, such as by tuning external voltage [20,25] or tuning the chemical potential of graphene [26]. As an example, the structure we proposed is based on hexagonal boron nitride (hBN), which is a low-loss natural material and its two permittivity components keep almost constant in the wavelength range from 0.4 to 0.8 μm [27,28].…”

Section: Introductionmentioning

confidence: 92%

Broadband and high-contrast-ratio optical diodes based on polarization conversion and photonic bandgap

Wu¹,

Fu²

2018

J. Opt.

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We propose to realize a broadband and high-contrast-ratio optical diode by using a layered structure composed of uniaxial crystal slabs with differently oriented optical axes. The operation principle is based on polarization conversion combined with photonic bandgap. Our numerical results show that an optical diode can be realized with the transmissivity contrast ratio higher than 10 000 in the wavelength range from 0.567 to 0.636 μm by using hexagonal boron nitride slabs for the structure. Theoretically, this method is suitable for any anisotropic materials, and the geometric parameters of the structure can be adjusted to tune the wavelength range as well as the transmissivity contrast ratio of the optical diode. Therefore, our work may provide useful guidelines to the design of compact broadband and high-contrast-ratio optical diodes.

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“…Optical diodes can realize unidirectional optical transmission [1]- [4], which are widely utilized for optical signal processing [5], [6]. Simultaneously, the processing speed and storage capacity of the optical system could be effectively improved [7]- [13].…”

Section: Introductionmentioning

confidence: 99%

All-Silicon Energy-Efficient Optical Diode Using Opto-Mechanical Microring Resonators

Liu

Chen

et al. 2020

IEEE Photonics J.

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By utilizing two cascaded all-silicon opto-mechanical microring resonators (MRRs), an energy-efficient optical diode with high nonreciprocal transmission ratios (NTRs) is proposed and experimentally realized. The optical diode is composed of an allpass opto-mechanical MRR and an add-drop opto-mechanical MRR. Due to the largely enhanced interaction between the photons and the suspended structure, the opto-mechanical effect can be dramatically improved. With injecting low optical powers, the optical gradient force can be effectively aroused in the opto-mechanical MRRs, which would arise nanometer scale waveguide deformations and the significant spectrum red-shifts of the rings. The opto-mechanical effect would cause different red-shifts of the two MRR resonances in the forward and backward transmissions, which contributes to realizing the nonreciprocal transmissions. The experimental results show that with −4.2 dBm power consumption, the optical diode can achieve high NTRs approach 41.8 dB. Due to the dominant advantages of complementary metal oxide semiconductor (COMS) compatibility, high NTRs (41.8 dB), low power consumption (−4.2 dBm) and compact size (0.015 mm 2), the device has remarkable applications in on-chip signal processing systems.

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Tunable spatial mode converters and optical diodes for graphene parallel plate waveguides

Cited by 12 publications

References 53 publications

Mode conversion in metal–insulator–metal waveguide with a shifted cavity

Mode conversion in metal–insulator–metal waveguide with a shifted cavity

Broadband and high-contrast-ratio optical diodes based on polarization conversion and photonic bandgap

All-Silicon Energy-Efficient Optical Diode Using Opto-Mechanical Microring Resonators

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