Advanced photonic filters based on cascaded Sagnac loop reflector resonators in silicon-on-insulator nanowires

Wu, Jiayang; Moein, Tania; Xu, Xingyuan; Moss, David J.

doi:10.1063/1.5025833

Cited by 114 publications

(118 citation statements)

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“…As the input CW power was increased, the MRRs with both uniformly coated and patterned GO films exhibited a clear decrease in ER and Q, whereas the uncoated MRR did not. The propagation loss of the GO hybrid waveguides was obtained by using the scattering matrix method [ 52,53 ] to fit the ERs and Qs in Figure 3a–d, and is shown for 1−5 layers and 10−50 layers in Figure 3e,f, respectively. Note that the propagation loss obtained from the GO‐coated MRRs is different from that obtained from the GO‐coated waveguides [ 29,43 ] when considering the power‐dependent loss changes of the GO films, since the light intensity in the MRRs is significantly higher due to resonant enhancements.…”

Section: Device Fabrication and Characterizationmentioning

confidence: 99%

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Yang

et al. 2020

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Layered 2D graphene oxide (GO) films are integrated with micro‐ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics. Both uniformly coated (1−5 layers) and patterned (10−50 layers) GO films are integrated on complementary‐metal‐oxide‐semiconductor (CMOS)‐compatible doped silica MRRs using a large‐area, transfer‐free, layer‐by‐layer GO coating method with precise control of the film thickness. The patterned devices further employ photolithography and lift‐off processes to enable precise control of the film placement and coating length. Four‐wave‐mixing (FWM) measurements for different pump powers and resonant wavelengths show a significant improvement in efficiency of ≈7.6 dB for a uniformly coated device with 1 GO layer and ≈10.3 dB for a patterned device with 50 GO layers. The measurements agree well with theory, with the enhancement in FWM efficiency resulting from the high Kerr nonlinearity and low loss of the GO films combined with the strong light–matter interaction within the MRRs. The dependence of GO's third‐order nonlinearity on layer number and pump power is also extracted from the FWM measurements, revealing interesting physical insights about the evolution of the GO films from 2D monolayers to quasi bulk‐like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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Section: Device Fabrication and Characterizationmentioning

confidence: 99%

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Yang

et al. 2020

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“…As the input CW power was increased, the MRRs with both uniformly coated and patterned GO films exhibited a clear decrease in ER and Q, whereas the uncoated MRR did not. The propagation loss of the GO hybrid waveguides was obtained by using the scattering matrix method [52,53] Note that the propagation loss obtained from the GO-coated MRRs is different from that obtained from the GO-coated waveguides [29,43] when considering the power-dependent loss changes of the GO films, since the light intensity in the MRRs is significantly higher due to resonant enhancements. The low-power (W/O in Figures 3(e)) propagation loss of the uncoated waveguide and the waveguide with a monolayer of GO was ~0.26 dB/cm and ~1.27 dB/cm, respectively, corresponding to an excess propagation loss of ~1 dB/cm induced by the GO film.…”

Section: Device Fabrication and Characterizationmentioning

confidence: 99%

Enhanced optical four-wave-mixing in integrated ring resonators with graphene oxide films

Moss¹,

Wu²,

Xu³

et al. 2020

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Layered two-dimensional (2D) graphene oxide (GO) films are integrated with micro-ring resonators (MRRs) to experimentally demonstrate enhanced nonlinear optics in the form of four-wave mixing (FWM). Both uniformly coated and patterned GO films are integrated on CMOS-compatible doped silica MRRs using a large-area, transfer-free, layer-by-layer GO coating method together with photolithography and lift-off processes, yielding precise control of the film thickness, placement, and coating length. The high Kerr nonlinearity and low loss of the GO films combined with the strong light-matter interaction within the MRRs results in a significant improvement in the FWM efficiency in the hybrid MRRs. Detailed FWM measurements are performed at different pump powers and resonant wavelengths for the uniformly coated MRRs with 1−5 layers of GO as well as the patterned devices with 10−50 layers of GO. The experimental results show good agreement with theory, achieving up to ~7.6-dB enhancement in the FWM conversion efficiency (CE) for an MRR uniformly coated with 1 layer of GO and ~10.3-dB for a patterned device with 50 layers of GO. By fitting the measured CE as a function of pump power for devices with different numbers of GO layers, we also extract the dependence of GO’s third-order nonlinearity on layer number and pump power, revealing interesting physical insights about the evolution of the layered GO films from 2D monolayers to quasi bulk-like behavior. These results confirm the high nonlinear optical performance of integrated photonic resonators incorporated with 2D layered GO films.

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“…The measured TE and TM polarized transmission spectra of the uniformly GO-coated MRR are shown in Figures 4(a-i) and (a-ii), respectively, while the transmission spectra of the patterned MRR are shown in Figures 4(b-i) and (b-ii), all measured with the same doped silica MRR at a CW power of ~0 dBm. The resulting Q factors [31][32][33] and extinction ratios [34,35] are shown in Figure 5(a). The uncoated MRR had high extinction ratios (> 15 dB) and relatively high Q factors (180,000) (although significantly less than for buried waveguides) for both polarizations.…”

Section: Go-coated Polarization-selective Mrrsmentioning

confidence: 99%

Graphene oxide (GO) 2D layered films for high efficiency integrated polarizers in ring resonators and waveguides

Moss¹,

Wu²,

Jiao³

et al. 2020

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<p>Polarization selective devices, such as polarizers and polarization selective resonant cavities (e.g., gratings and ring resonators), are core components for polarization control in optical systems and find wide applications in polarization-division-multiplexing, coherent optical detection, photography, liquid crystal display, and optical sensing. In this paper, we demonstrate integrated waveguide polarizers and polarization-selective micro-ring resonators (MRRs) incorporated with graphene oxide (GO). We achieve highly precise control of the placement, thickness, and length of the GO films coated on integrated photonic devices by using a solution-based, transfer-free, and layer-by-layer GO coating method followed by photolithography and lift-off processes. The latter overcomes the layer transfer fabrication limitations of 2D materials and represent a significant advance towards manufacturing integrated photonic devices incorporated with 2D materials. We measure the performance of the waveguide polarizer for different GO film thicknesses and lengths versus polarization, wavelength, and power, achieving a very high polarization dependent loss (PDL) of ~ 53.8 dB. For GO-coated integrated MRRs, we achieve an 8.3-dB polarization extinction ratio between the TE and TM resonances, with the extracted propagation loss showing good agreement with the waveguide results. Furthermore, we present layer-by-layer characterization of the linear optical properties of 2D layered GO films, including detailed measurements that conclusively determine the material loss anisotropy of the GO films as well as the relative contribution of film loss anisotropy versus polarization-dependent mode overlap, to the device performance. These results offer interesting physical insights and trends of the layered GO films from monolayer to quasi bulk like behavior and confirm the high-performance of integrated polarization selective devices incorporated with GO films.</p>

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Advanced photonic filters based on cascaded Sagnac loop reflector resonators in silicon-on-insulator nanowires

Cited by 114 publications

References 46 publications

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

2D Layered Graphene Oxide Films Integrated with Micro‐Ring Resonators for Enhanced Nonlinear Optics

Enhanced optical four-wave-mixing in integrated ring resonators with graphene oxide films

Graphene oxide (GO) 2D layered films for high efficiency integrated polarizers in ring resonators and waveguides

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