Topology optimization of waveguide bends with wide, flat bandwidth in air-bridge-type photonic crystal slabs

Watanabe, Yoshinori; Ikeda, Naoki; Sugimoto, Yoshimasa; Takata, Yoshiaki; Kitagawa, Yoshinori; Mizutani, Akio; Ozaki, Nobuhiko; Asakawa, Kiyoshi

doi:10.1063/1.2739317

Cited by 29 publications

(10 citation statements)

References 22 publications

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“…However, directly matching the dispersion relationship of the PCW bends with straight PCWs seems tough due to the nonperiodical structure at the bending corner [10]. Thus extensive researches have been carried out to reduce the bending loss by means of resonance matching [6], impedance matching [11] and topology optimization [12][13][14]. Despite all this, treating the bend as a cavity or using impedance-matching can only explain the result of a single wavelength [13].…”

Section: Introductionmentioning

confidence: 95%

Low loss sharp photonic crystal waveguide bends

Zhao

Cui

Feng

et al. 2015

Optics Communications

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Section: Introductionmentioning

confidence: 95%

Low loss sharp photonic crystal waveguide bends

Zhao

Cui

Feng

et al. 2015

Optics Communications

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“…The TO method, which has been developed for PC designs by Borel et al (5), was applied to our PC-FF waveguides design (6). Different from the case of a 2DPC straight waveguide, the PC-FF includes a variety of waveguides such as bend, wavelength-selective Y branch and directional coupler.…”

Section: Topology Optimization Of Pc Waveguidesmentioning

confidence: 99%

Photonic Crystal and Quantum Dot Technologies for Ultra-small and Ultra-fast All-optical Flip-flop

Ozaki¹,

Ikeda²,

Watanabe³

et al. 2009

ECS Trans.

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Nano-photonic technologies of GaAs-based two-dimensional photonic crystal (2DPC) slab waveguides and InAs quantum dots (QDs) are reviewed for symmetric Mach-Zehnder type, ultra-small and ultra-fast all-optical switch (PC-SMZ) and optical flip-flop device (PC-FF). In the 1st phase of this work, ultra-fast (~ps) and ultra-low energy (~100 fJ) switching has been demonstrated using the PC-SMZ chip with 600 μm × 300 μm in size. In the 2nd phase, the concept of the PC-FF based on the dual PC-SMZs for providing a latch function has been proposed for a future ultra-fast optical digital processor. One of the priority subjects is to establish a new design method, i.e., topology optimization method of the 2DPC waveguide with wide/flat bandwidth, high transmittance and low reflectivity. Another one is to develop a selective-area-MBE growth technique with a metal-mask method for high-density and highly uniform InAs QDs with different absorption wavelengths in different areas.

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“…Thus, the interaction between light and matter can be greatly enhanced, which is important for investigations of cavity quantum electrodynamics 1,[3][4][5] . PhC waveguide can guide light with very low losses 6,7 . The coupled PhC cavity-waveguide structures have been used to realize various types of optical devices, such as optical switches [8][9][10][11][12][13][14] and optical sensors 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Gain enhanced Fano resonance in a coupled photonic crystal cavity-waveguide structure

Zhao

Qian

Qiu

et al. 2016

Sci Rep

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Systems with coupled cavities and waveguides have been demonstrated as optical switches and optical sensors. To optimize the functionalities of these optical devices, Fano resonance with asymmetric and steep spectral line shape has been used. We theoretically propose a coupled photonic crystal cavity-waveguide structure to achieve Fano resonance by placing partially reflecting elements in waveguide. To enhance Fano resonance, optical gain material is introduced into the cavity. As the gain increases, the transmission line shape becomes steepened and the transmissivity can be six times enhanced, giving a large contrast by a small frequency shift. It is prospected that the gain enhanced Fano resonance is very useful for optical switches and optical sensors.

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Topology optimization of waveguide bends with wide, flat bandwidth in air-bridge-type photonic crystal slabs

Cited by 29 publications

References 22 publications

Low loss sharp photonic crystal waveguide bends

Low loss sharp photonic crystal waveguide bends

Photonic Crystal and Quantum Dot Technologies for Ultra-small and Ultra-fast All-optical Flip-flop

Gain enhanced Fano resonance in a coupled photonic crystal cavity-waveguide structure

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