Ultralow-power on-chip all-optical Fano diode based on uncoupled nonlinear photonic-crystal nanocavities

Xie, Jingya; Hu, Xiaoyong; Wang, Feifan; Ao, Yutian; Gao, Wei; Yang, Hong; Gong, Qihuang

doi:10.1088/2040-8986/aaa796

Cited by 10 publications

(8 citation statements)

References 45 publications

(55 reference statements)

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“…其中光子晶体因具有光子带隙和光子局域特性, 且易微纳尺度集成、可用于控制波长与其周期相比拟的电磁波, 因此在制备微纳集成光学器件时光子晶体常被作为首选结构 [12] . 利用光子晶体实现光波单向传输为当前研究热点, 其中的实现方案有方向带隙失配型 [13,14] 、不对称腔耦合型 [15−17] 、奇偶模转换型 [18,19] 、光栅光子晶体复合型 [20] 和异构光子晶体全反射型 [21−24] 等. 李志远课题组 [13] 利用方向带隙失配原理提出的光波单向传输器件正向透射率较低为0.23, 光信息传输效率低.…”

Section: 引言unclassified

Unidirectional transmission of funnel-shaped waveguide with complete bandgap

Zhi¹,

Fei²,

Han³

et al. 2022

Acta Phys. Sin.

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It will be a future trend to apply quantum photonic technology to communication technology and information processing. One of major developing directions of quantum photonic technology is the miniaturization and on-chip integration. Like the diodes in integrated electric circuitry, optical unidirectional transmitter devices (UTDs) play an important role in processing the quantum information and also represent the main components of integrated optical devices. Thus, the design of UTDs has become one of the research hotspots. With photonic bandgap and localization characteristics, as well as easy micro-nano scaled integration, the photonic crystals (PCs) are often preferred when used to develop micro-nano integrated optical devices. At present, the common methods of achieving UTD with photonic crystals include directional bandgap mismatch, asymmetrical coupling by a micro-cavity, odd-even mode conversion, total reflection of photonic crystals with grating and photonic crystal heterostructure, etc.. However, these optical unidirectional transmitters gained through the above methods generally have a low forward transmission, narrow working band, complex structure, etc. In the paper a novel method of UTD is put forward based on photonic crystal and a UTD of funnel-shaped waveguide is designed. The design of the device is divided into two parts: optimal funnel waveguide design and optimal point defect design. The band structure of TE polarized photonic crystal is calculated by R-soft. A triangular lattice circular air hole photonic crystal with complete photonic band gap is used as the initial structure and line defects are introduced to form a funnel-shaped waveguide structure (FSWS). The FSWS consists of the first waveguide W1, the second waveguide W2 and a funnel cavity. The funnel cavity is shaped like a funnel and located at the coupling between W1 and W2. Owing to the unique characteristics of the waveguide, the light wave transmission will be localized in the waveguide, which is conducive to improving the forward transmission. The influence of width variation of W2 with forward and backward incident light are analyzed by the finite difference time domain (FDTD) method, and W2 is selected as a waveguide formed by removing 11 rows of air holes. The FSWS achieves the initial asymmetric transmission, while the backward transmission remains high. Further studies are conducted to introduce four types of point defects to suppress the backward transmittance. The point defects refer to moving one or two air holes. In the work the FDTD is also used to calculate four kinds of point defect backward transmittance spectra and optimize the positions of point defects. Finally, it is found that when the optimal point defect mode is type I and d = 5a, the forward transmission (Tf) and transmission contrast (C) at 1550 nm are 0.716 and 0.929, respectively. Working bandwidth (B) can be increased up to 111 nm (1501–1612 nm). By mode analysis, it is found that the point defect introduces mode mismatch between W1 and W2, by converting the fundamental mode in W2 into high-order modes. Thus, the back-propagating light waves in W2 cannot effectively couple into W1, resulting in complete blockage of backward propagation. In addition, the structure is made of silicon based air hole photonic crystal. The 2D air-hole PC slab is mature and even compatible with conventional complementary metal oxide semiconductor (CMOS) processing. The designed UTD is easy to implement, and has the advantages of simplicity and high unidirectional transmission characteristics. Therefore, it can provide a new solution for UTDs with higher requirements for integrated optical path at present.

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Section: 引言unclassified

Unidirectional transmission of funnel-shaped waveguide with complete bandgap

Zhi¹,

Fei²,

Han³

et al. 2022

Acta Phys. Sin.

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“…Consequently, the device response can be manipulated with lower optical powers [28], [29]. Therefore, the silicon-based opto-mechanical MRR provides an energy-efficient solution for on-chip dynamic signal processing [30]- [32].…”

Section: Introductionmentioning

confidence: 99%

On-Chip All-Optical Tunable Filter With High Tuning Efficiency

Chen

Liu

et al. 2020

IEEE Photonics J.

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We propose and realize a bandwidth and wavelength-tunable all-optical filter with high tuning efficiency based on double opto-mechanical microring resonators (MRRs) assisted Mach-Zehnder interferometer (MZI) structure, which is beneficial to achieve high extinction ratio and shape factor. As the optical field gradient is largely enhanced in the free-hanging MRRs, the opto-mechanical effect could be excited by low power consumption. By injecting the corresponding low resonance powers, the drop transmission of each MRR could be flexibly tuned based on the opto-mechanical effect. Consequently, the synthetic transmission of the microring-assisted MZI could be efficiently manipulated. The results show that by injecting pump powers of 0.40 mW and 1.84 mW, the bandwidth and wavelength of the all-optical filter could be tuned from 0.17 nm to 0.30 nm, and from 1550.09 nm to 1550.60 nm respectively with maintaining a high extinction ratio of 38 dB and a small passband ripple of 1 dB. Especially, the tuning efficiencies of bandwidth and wavelength could realize up to 0.325 nm/mW and 0.277 nm/mW, respectively. The proposed optical filter has dominant advantages of high tuning efficiencies and extinction ratios, small passband ripple and compact footprint, which has significant applications in on-chip all-optical systems.

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“…Fano resonances in high Q photonic crystal cavities always have extremely high Q factors [13]. The advantage of photonic crystal cavities with small mode volume and high Q factor has attracted tremendous interests for Fano device applications [14][15][16]. In 2D PhC cavity systems, Fano resonances as we known have been produced by the interference of two modes originated from different cavities.…”

Section: Introductionmentioning

confidence: 99%

Fano Resonances from Quadrupole-dipole Split Mode Interference in Photonic Crystal Waveguide-single-cavity Structure

An¹,

Fu²,

Ouyang³

2019

Proceedings of the 2nd International Conference on Electrical and Electronic Engineering (EEE 2019)

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In this paper, a waveguide-single-cavity structure in a square-lattice photonic crystal is proposed to generate Fano resonances by the interference of two split modes in the structure with a rectangle defect column in the cavity. Through analyzing the band map of the modes in the bandgap region, Fano resonances with different line shape are found by tuning the parameters of the defect column. The results show that the bright and dark modes for Fano resonances are controllable by the parameters of the defect cavity simultaneously. The Q factor of Fano modes increases with the dark mode going farer from the bright mode and an ultra-high value 10 6 of Q is obtained. These Fano modes can be applied in many optical devices, such as ultra-narrow filters, switch, and sensors.

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Ultralow-power on-chip all-optical Fano diode based on uncoupled nonlinear photonic-crystal nanocavities

Cited by 10 publications

References 45 publications

Unidirectional transmission of funnel-shaped waveguide with complete bandgap

Unidirectional transmission of funnel-shaped waveguide with complete bandgap

On-Chip All-Optical Tunable Filter With High Tuning Efficiency

Fano Resonances from Quadrupole-dipole Split Mode Interference in Photonic Crystal Waveguide-single-cavity Structure

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