Deep-subwavelength plasmonic mode converter with large size reduction for Si-wire waveguide

Ono, Masaaki; Taniyama, Hideaki; Xu, Hao; Tsunekawa, Masato; Kuramochi, Eiichi; Nozaki, Kengo; Notomi, Masaya

doi:10.1364/optica.3.000999

Cited by 69 publications

(40 citation statements)

References 24 publications

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“…2b). We confirmed that the performance of the MIM-WG and mode converters was almost the same as in our previous work 36 . In fact, we achieved almost the same coupling efficiency (1.7 dB), even though the smallest slot size is reduced to 30  20 nm 2 from 50  20 nm 2 .…”

Section: Methodssupporting

confidence: 90%

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Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides

et al. 2019

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All-optical switches have attracted attention because they can potentially overcome the speed limitation of electric switches. However, ultrafast, energy-efficient all-optical switches have been challenging to realize due to the intrinsically small optical nonlinearity in existing materials. As a solution, we propose graphene-loaded deep-subwavelength plasmonic waveguides (30  20 nm 2 ). Thanks to extreme light confinement, we have significantly enhanced optical nonlinear absorption in graphene, and achieved ultrafast all-optical switching with a switching energy of 35 fJ and a switching time of 260 fs. The switching energy is four orders of magnitudes smaller than that in previous graphene-based devices and is the smallest value ever reported for any all-optical switch operating at a few picoseconds or less. This device can be efficiently connected to conventional Si waveguides and employed in Si photonic integrated circuits. We believe that this graphene-based device will pave the way towards on-chip ultrafast and energy-efficient photonic processing.

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Section: Methodssupporting

confidence: 90%

“…S7). This broadband feature is an important characteristic of our devices, and we attribute it to the nature of the graphene absorbance and the broadband characteristics of our MIM-WG including the mode converter 36 .…”

Section: Methodsmentioning

confidence: 98%

Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides

et al. 2019

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“…We used the reported values in [8] and [10] for mode conversion to plasmonic slot waveguides with 250 nm and 30 nm thick Au layers, respectively. We searched around these design points, varied h Si and other dimensions to come up with the optimized parameters in Table II. The norm of the electric field on the central plane that cuts through the structure is plotted in Fig.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Metal Thickness on Si Wire to Plasmonic Slot Waveguide Mode Conversion

Kocabaş¹

2017

SDÜ Fen Bil Enst Der

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We investigate mode converters for Si wire to plasmonic slot waveguides at 1550 nm telecom wavelength. The structures are based on a taper geometry. We provide optimal dimensions with more than 90% power transmission for a range of metal (Au) thicknesses between 30-250 nm. We provide details on how to differentiate between the total power and the power in the main mode of the plasmonic slot waveguide. Our analysis is based on the orthogonality of modes of the slot waveguide subject to a suitable inner product definition. Our results are relevant for lowering the insertion loss and the bit error rate of plasmonic modulators. Özet: Bu çalışmada 1550 nm telekom dalga boyunda çalışan, Si tel dalga kılavuzundan plazmonik yiv dalga kılavuzuna kip dönüştürücülerini inceledik. Söz konusu yapılar gittikçe incelen bir geometriye sahiptir. 30-250 nm arasındaki metal (Au) kalınlıkları için %90'dan yüksek güç iletimine sahip en uygun boyutları sunduk. Plazmonik yiv dalga kılavuzuna eşlenen güç ile iletilen toplam gücün nasıl birbirinden ayrılabilecegini ayrıntılarıyla açıkladık.İncelememiz yiv dalga kılavuzu kiplerinin uygun bir iç çarpım tanımı sonucu birbirlerine dikgen olmasına dayanmaktadır. Sonuçlarımız plazmonik modülatörlerin baglanma kaybı ve bit hata oranlarının azaltılmasına katkı sunacaktır.

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“…The authors overcome this limitation by combining the plasmonic hotspots at the edge of the gold metal (shown in the Fig. 21e calculations) and the high photonic-to-plasmonic efficiency of the plasmonic taper section [211], over micron-scale interaction lengths. Graphene's ultrafast saturable absorption (SA) thereby leads to the transmission of a signal pulse when a control pulse overlapped with it.…”

Section: All-optical Switchingmentioning

confidence: 99%

Nanoscale nonlinear plasmonics in photonic waveguides and circuits

Tuniz

2021

Riv. Nuovo Cim.

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Optical waveguides are the key building block of optical fiber and photonic integrated circuit technology, which can benefit from active photonic manipulation to complement their passive guiding mechanisms. A number of emerging applications will require faster nanoscale waveguide circuits that produce stronger light-matter interactions and consume less power. Functionalities that rely on nonlinear optics are particularly attractive in terms of their femtosecond response times and terahertz bandwidth, but typically demand high powers or large footprints when using dielectrics alone. Plasmonic nanostructures have long promised to harness metals for truly nanoscale, energy-efficient nonlinear optics. Early excitement has settled into cautious optimism, and recent years have been marked by remarkable progress in enhancing a number of photonic circuit functions with nonlinear plasmonic waveguides across several application areas. This work presents an introductory review of nonlinear plasmonics in the context of guided-wave structures, followed by a comprehensive overview of related experiments and applications covering nonlinear light generation, all-optical signal processing, terahertz generation/detection, electro optics, quantum optics, and molecular sensing.

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Deep-subwavelength plasmonic mode converter with large size reduction for Si-wire waveguide

Cited by 69 publications

References 24 publications

Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides

Ultrafast and energy-efficient all-optical switching with graphene-loaded deep-subwavelength plasmonic waveguides

The Effect of Metal Thickness on Si Wire to Plasmonic Slot Waveguide Mode Conversion

Nanoscale nonlinear plasmonics in photonic waveguides and circuits

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