Dramatic size reduction of waveguide bends on a micron-scale silicon photonic platform

Cherchi, Matteo; Ylinen, Sami; Harjanne, Mikko; Kapulainen, Markku; Aalto, Timo

doi:10.1364/oe.21.017814

Cited by 186 publications

(96 citation statements)

References 28 publications

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“…As the anapole states are tightly confined in the near-field, optical nano-circuitry based on non-radiating modes is extremely robust to bending and splitting, as shown in Figure 5. In standard photonics applications, wave-guide deformation produces significant radiation losses, in particular when considering 90-degree bends and turns [23]. Conversely, in the case of an anapole nanochain, the near-field properties of the non-radiating state allow for efficient transmission of the guided mode across deformations and bends, such as in the case of wave-guide splitting (Figure 5a) or 90-degree bending and re-routing (Figure 5b).…”

Section: Discussionmentioning

confidence: 99%

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

2017

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All-dielectric metamaterials are a promising platform for the development of integrated photonics applications. In this work, we investigate the mutual coupling and interaction of an ensemble of anapole states in silicon nanoparticles. Anapoles are intriguing non-radiating states originated by the superposition of internal multipole components which cancel each other in the far-field. While the properties of anapole states in single nanoparticles have been extensively studied, the mutual interaction and coupling of several anapole states have not been characterized. By combining first-principles simulations and analytical results, we demonstrate the transferring of anapole states across an ensemble of nanoparticles, opening to the development of advanced integrated devices and robust waveguides relying on non-radiating modes.

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Section: Discussionmentioning

confidence: 99%

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

2017

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“…Bending structure has been studied as early as 1920s [33]. Researchers have reported very low bending loss designs [27], [28]. However, these works are for electrically large bending structures, such as [27] with about 113 wavelengths and [28] with about 6 wavelengths.…”

Section: Radiation Lossmentioning

confidence: 99%

“…Researchers have reported very low bending loss designs [27], [28]. However, these works are for electrically large bending structures, such as [27] with about 113 wavelengths and [28] with about 6 wavelengths. Because the practical constraints of integrated circuit fabrication and packaging, a large bending structure is not feasible to integrate and the investigation of a small bending structure is needed.…”

Section: Radiation Lossmentioning

confidence: 99%

High-Efficiency Micromachined Sub-THz Channels for Low-Cost Interconnect for Planar Integrated Circuits

Wang

et al. 2016

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper presents for the first time the design, fabrication, and demonstration of micromachined silicon dielectric waveguide based sub-THz interconnect channel for high efficiency, low cost sub-THz interconnect, aiming to solve the longstanding intra-/inter-chip interconnect problem. Careful studies of the loss mechanisms in the proposed sub-THz interconnect channel are carried out to optimize the design. Both theoretical and experimental results are provided with good agreement. To guide the channel design, a new Figure-of-Merit is also defined. The insertion loss of this first prototype with a 6-mm long interconnect channel is about 8.4 dB at 209.7 GHz, with a 3-dB bandwidth of 12.6 GHz.

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“…Moreover, quantum optical experiments such as the generation of squeezed light [10] and correlated photon pairs [11] have also been implemented based on integrated microresonator devices. While most microresonator devices in integrated photonics are formed by single-mode waveguides [12,13], many recent photonic integrated circuits rely on multi-mode waveguides due to their lower losses [14,15], higher data capacity [16], improved device integration [17] and tailored dispersion properties e.g. to attain anomalous group velocity dispersion required for parametric frequency conversion [18,19].…”

Section: Introductionmentioning

confidence: 99%

Coupling Ideality of Integrated Planar High-QMicroresonators

et al. 2017

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( † These authors contributed equally to this work.)Chipscale optical microresonators with integrated planar optical waveguides are useful building blocks for linear, nonlinear and quantum optical photonic devices alike. Loss reduction through improving fabrication processes has resulted in several integrated microresonator platforms attaining quality (Q) factors of several millions. Beyond improvement of quality factor, the ability to operate the microresonator with high coupling ideality in the overcoupled regime is of central importance. In this regime the dominant source of loss constitutes the coupling to a single, desired output channel, which is particularly important not only for quantum optical applications such as the generation of squeezed light and correlated photon pairs but also for linear and nonlinear photonics. However to date, the coupling ideality in integrated photonic microresonator is not well understood, in particular design-dependent losses and their impact on the regime of high ideality. Here we investigate design-dependent parasitic losses, described by the coupling ideality, of the commonly employed microresonator design consisting of a microring resonator waveguide side-coupled to a straight bus waveguide, a system which is not properly described by the conventional input-output theory of open systems, due to the presence of higher-order modes. By systematic characterization of multi-mode high-Q silicon nitride microresonator devices, we show that this design can suffer from low coupling ideality. By performing 3D simulations, we identify the coupling to higher-order bus waveguide modes as the dominant origin of parasitic losses which lead to the low coupling ideality. Using suitably designed bus waveguides, parasitic losses are mitigated with a nearly unity ideality and strong overcoupling (i.e. a ratio of external coupling to internal resonator loss rate > 9), are demonstrated. Moreover, we find that different resonator modes can exchange power through the coupler, which therefore constitutes a mechanism that induces modal coupling, a phenomenon known to distort resonator dispersion properties. Our results demonstrate the potential for significant performance improvements of integrated planar microresonators for applications in quantum optics and nonlinear photonics, achievable by optimized coupler designs.

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Dramatic size reduction of waveguide bends on a micron-scale silicon photonic platform

Cited by 186 publications

References 28 publications

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

Near-Field Coupling and Mode Competition in Multiple Anapole Systems

High-Efficiency Micromachined Sub-THz Channels for Low-Cost Interconnect for Planar Integrated Circuits

Coupling Ideality of Integrated Planar High-QMicroresonators

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