Silicon waveguide grating coupler for perfectly vertical fiber based on a tilted membrane structure

Liu, Liu; Zhang, Jianhao; Zhang, Chenzhao; Wang, Siya; Jin, Chichao; Chen, Yujie; Chen, Kaixuan; Xiang, Tuowen; Shi, Yaocheng

doi:10.1364/ol.41.000820

Cited by 24 publications

(8 citation statements)

References 16 publications

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“…However, attachment of fiber without tilt angle is preferred in packaging. Therefore, many studies focus on improving the performance of perfectly vertical GC [19][20][21][22][23][24][25][26][27][28]. For the bi-directional propagation nature of perfectly vertical incidence, some designs adopt bi-directional coupling to two waveguides [25,27] while others add reflective structure to enhance coupling for only one direction [21,28].…”

Section: Bragg Condition Loss Channels and Fiber Tilt Anglementioning

confidence: 99%

Grating Couplers on Silicon Photonics: Design Principles, Emerging Trends and Practical Issues

et al. 2020

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Silicon photonics is an enabling technology that provides integrated photonic devices and systems with low-cost mass manufacturing capability. It has attracted increasing attention in both academia and industry in recent years, not only for its applications in communications, but also in sensing. One important issue of silicon photonics that comes with its high integration density is an interface between its high-performance integrated waveguide devices and optical fibers or free-space optics. Surface grating coupler is a preferred candidate that provides flexibility for circuit design and reduces effort for both fabrication and alignment. In the past decades, considerable research efforts have been made on in-plane grating couplers to address their insufficiency in coupling efficiency, wavelength sensitivity and polarization sensitivity compared with out-of-plane edge-coupling. Apart from improved performances, new functionalities are also on the horizon for grating couplers. In this paper, we review the current research progresses made on grating couplers, starting from their fundamental theories and concepts. Then, we conclude various methods to improve their performance, including coupling efficiency, polarization and wavelength sensitivity. Finally, we discuss some emerging research topics on grating couplers, as well as practical issues such as testing, packaging and promising applications.

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Section: Bragg Condition Loss Channels and Fiber Tilt Anglementioning

confidence: 99%

Grating Couplers on Silicon Photonics: Design Principles, Emerging Trends and Practical Issues

et al. 2020

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“…Compared to classical perfect grating coupler, whose coupling efficiency spectra are shown in the Supporting Information (Figure S3e,f, Supporting Information), the coupling efficiency of TE mode has been significantly improved by using intelligent algorithm. Compared to previous reports, [ 39–42 ] our disordered‐grating coupler with a 6 µm side length, on the basis of ensuring a certain coupling performance, greatly reduces the size to facilitate integration and possesses high coupling efficiency. The developed intelligent algorithm provides a highly efficient design method for grating‐coupling ports by converting the light from the free space onto chip.…”

Section: Figurementioning

confidence: 98%

“…However, the coupling efficiency is quite low and the size is large for TE mode and TM mode by using the traditional perfect grating. [ 39–42 ] Therefore, we have designed disordered grating structures also using the developed intelligent algorithm in order to realize highly efficient coupling for TE and TM modes, respectively. The designed disordered gratings by the intelligent algorithm possess high efficiency both for TE and TM modes.…”

Section: Figurementioning

confidence: 99%

Nanophotonic Polarization Routers Based on an Intelligent Algorithm

Liu

et al. 2020

Advanced Optical Materials

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computing. This requires on-chip integrated photonic devices to have the performances of small volume, low power consumption, and easy integration with other nanophotonic devices. [3,4] As an essential component of on-chip integrated photonic devices, polarization router can separate and steer light with different polarizations of transverse electric (TE) and transverse magnetic (TM) modes into different output ports, so as to realize polarization division multiplex of channels. In the past few years, polarization routers are generally realized based on gratings, [5][6][7][8] optical waveguides, [9][10][11][12] photonic crystals, [13][14][15][16] plasmonic structures, [17][18][19][20] metamaterials [21][22][23] or some other structures. [24][25][26][27] Polarization routers based on gratings or waveguides usually possess simple configurations and high extinction ratio, but the large size restricts the practical applications for onchip dense integration. [5,[7][8][9][10] The routers based on photonic crystals possess high transmittance, but the bandwidth is narrow and the crosstalk is relatively large. [13,16] The plasmonic polarization routers are broadband and have smaller size, but usually possess large loss. [17,18] Polarization routers based on metamaterials have high efficiency, but the fabrication process is complicated and the size is relatively large. [21,23] Large size and low-efficiency excitation of traditional design cause the polarization routers to be difficult to meet the requirements of high-density on-chip integration. Therefore, it is a great challenge Nanophotonic polarization routers, which can separate and steer light with different polarizations of transverse electric and transverse magnetic modes into different output ports, are an essential component of on-chip integrated photonic circuits. By developing an intelligent algorithm that combines the genetic algorithm and the finite element method, various polarization routers possessing different operation bands, different structures, and different materials, which can be easily fabricated and integrated, are successfully designed. On-chip ultrasmall silicon-based polarization routers are experimentally demonstrated in the near-infrared range. The footprint is only 970 nm × 1240 nm, which is the smallest demonstrated. The measured normalized transmission is up to 85% in the near infrared range. Additionally, a broadband highly efficient photon coupler is also achieved based on disordered-grating configurations designed by the intelligent algorithm. This breaks the restrictions of traditional structures, provides a universal platform for the realization of nanophotonic polarization routers, and paves a way for the design and high-density on-chip integration of nanophotonic devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adom.201902018.With the development of big data age, the requirements for large information capacity is becoming higher and higher. On-chip integrated phot...

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“…This approach allows for a better control of the plasmonic mode behavior as well as the interaction volume between the mode and an active material of the detector. However, coupling in and out of the waveguide might be required and can introduce considerable losses [47]- [49]. This type of plasmonic enhancement is most suitable when the interaction volume between light and an active material is too small for direct vertical coupling.…”

Section: Plasmonically Enhanced Detection Schemesmentioning

confidence: 99%

Plasmonic Photodetectors

Dorodnyy

Salamin

et al. 2018

IEEE J. Select. Topics Quantum Electron.

102

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Plasmonic photodetectors are attracting the attention of the photonics community. Plasmonics is attractive because metallic structures have the ability to confine light by coupling an electromagnetic wave to charged carrier oscillations at the surface of the metal. The wavelength of such oscillations can be much smaller than the corresponding light wavelength in vacuum. This enables the light-matter interaction on a deep subwavelength scale, which in turn allows for more compact and potentially higher speed devices. In this review, we discuss different types of photodetectors and ways in which plasmonics can be applied to them. We elucidate several plasmonic photodetector concepts/schemes and discuss the main physical principles behind their operation. Finally, we reflect on the characteristics of an "ideal" photodetector and propose a device that might be the perfect plasmonic detector.

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Silicon waveguide grating coupler for perfectly vertical fiber based on a tilted membrane structure

Cited by 24 publications

References 16 publications

Grating Couplers on Silicon Photonics: Design Principles, Emerging Trends and Practical Issues

Grating Couplers on Silicon Photonics: Design Principles, Emerging Trends and Practical Issues

Nanophotonic Polarization Routers Based on an Intelligent Algorithm

Plasmonic Photodetectors

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