FSR-free add–drop filter based on silicon grating-assisted contradirectional couplers

Qiu, Huiye; Jiang, Guannan; Hu, Ting; Shao, Haifeng; Yu, Ping; Yang, Jianyi; Jiang, Xiaoqing

doi:10.1364/ol.38.000001

Cited by 53 publications

(13 citation statements)

References 10 publications

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“…In many practical implementations, ultrasound transducers are placed over an aperture that does not enclose the object, and the result is the limited-view problem [1]. To avoid this problem, arc-shaped and bowl-shaped transducers are employed instead of the generally used 1D ultrasound transducers [2], [3]. With ultrasound imaging, the transmitted ultrasound does not have functional interaction with the object; however, with a beam-forming technique, a complex set of control pulses emitted from 1D ultrasound transducers can form arc-shaped sound waves, resulting in a high-quality image.…”

Section: Introductionmentioning

confidence: 99%

Visualization of photoacoustic images in a limited-View measuring system using eigenvalues of a photoacoustic transmission matrix

Abe

Shiina

2017

Photoacoustics

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Photoacoustic imaging is a unique imaging method that involves extracting information from points at different depths, an advantage of ultrasound imaging, while maintaining functional information, a key feature of conventional photo imaging. This makes it easy to add functional images to ultrasound images by adding a laser pulse source to the conventional ultrasound imaging device and detecting a photo-ultrasound signal via a conventional ultrasound probe. One challenge when using normal one-dimensional (1D) probes and generating photoacoustic images is the limited-view problem, in which artefacts are observed due to the positions of the ultrasound transducers. In this study, we used a photoacoustic transmission matrix (PA-TM) for simulation and performed a verification test using a 1D probe and a phantom. The results confirmed that the eigenvalues of the PA-TM visualized the light absorber itself in the limited-view measurement system, which eliminates reconstruction artefacts and further scattering artefacts, and that visualization is possible by signal intensity amplification through further phase modulation.

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Section: Introductionmentioning

confidence: 99%

Visualization of photoacoustic images in a limited-View measuring system using eigenvalues of a photoacoustic transmission matrix

Abe

Shiina

2017

Photoacoustics

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“…An actively tunable plasmonic device with band-pass function has been investigated using graphene metamaterials [20]. In addition, the transmission for filters is pretty sensitive to the phase shift between the resonators and the waveguide feedback mechanism [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic tunable filter based on trapezoid resonator waveguide

Song

Wang

et al. 2015

Journal of Modern Optics

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2015): Plasmonic tunable filter based on trapezoid resonator waveguide, Journal of Modern Optics,The metal-insulator-metal waveguide structures coupled with a trapezoid cavity are proposed in theory. A variety of transmission features have been found from the simulation results, which is caused by the interference of the plasmonic modes in the trapezoid resonator. The transmission spectra can be effectively modulated by optimizing the geometrical parameters of our configurations such as the height, the upper and bottom edge lengths. Also, the coupling distance possesses great importance on the transmission characteristic. It is found that when the coupling distance is chosen to be around 20 nm, the filter works efficiently. When the trapezoid resonator is attached to the waveguide bus, the bandwidth becomes large. Besides, an effective band-stop filter can be achieved when the bottom edge length is large enough. The finite element method is carried out to verify our designs. We hope our work may open some new avenues for a high-performance plasmonic filter.

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“…4(a) and 4(b), for TE polarization, the contra-directional coupling at the central wavelength of 1550 nm has a working bandwidth around 40 nm (from 1526 nm to 1566 nm) for a low TE to TM crosstalk around −12 dB at through port. The bandwidth is much broader than that of GACCs in [16,17], which is because of the strong coupling induced by the larger refractive-index perturbation. The insertion loss is 0.48 dB at the central wavelength 1550 nm for the drop-port spectrum, and the TE to TM crosstalk is around −21 dB.…”

mentioning

confidence: 97%

Compact polarization splitter based on silicon grating-assisted couplers

Qiu

et al. 2015

Opt. Lett.

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Compact polarization beam splitter (PBS) based on grating-assisted couplers is proposed by utilizing contra-directional coupling between two corrugated strip waveguides. The co-directional coupling in the device is greatly suppressed by the designed asymmetric structure. The phase matching condition is only satisfied for TE polarization at the central wavelength of 1550 nm by a spatially periodic refractive-index perturbation. Due to the contra-directional coupling, the device breaks the limit of the precise control of the coupling strength and length. The simulation results show that the presented PBS, with a coupling length of only 19 μm, has a broad working bandwidth (∼40 nm) for a crosstalk below -12 dB. A large fabrication tolerance (±40 nm) for the waveguide width is also achieved.

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FSR-free add–drop filter based on silicon grating-assisted contradirectional couplers

Cited by 53 publications

References 10 publications

Visualization of photoacoustic images in a limited-View measuring system using eigenvalues of a photoacoustic transmission matrix

Visualization of photoacoustic images in a limited-View measuring system using eigenvalues of a photoacoustic transmission matrix

Plasmonic tunable filter based on trapezoid resonator waveguide

Compact polarization splitter based on silicon grating-assisted couplers

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