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Experimental demonstration of high-Q MRR based on a germanium-on-insulator platform with an yttria insulator in the mid-IR range

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Photonics Research 2023年第11期11卷 I0017-I0024页

作者： JINHA LIM JOONSUP SHIM INKI kim sanghyeon kim School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

We experimentally demonstrate an all-pass microring resonator (MRR) based on a Y_(2)O_(3)BOX germanium-oninsulator (GeOI) platform operating in the mid-IR *** ring resonator was numerically designed to have a high quality (Q) factor in the 4.18μm to 4.22μm wavelength range in the fundamental TE *** to our design,the GeOI ring resonator was fabricated by the direct wafer-bonding technology with an yttria(Y_(2)O_(3)) buried oxide layer,which is transparent at the mid-IR region,for the bonding interface and the electron beam *** experimental resonant characteristic was obtained using our fiber-based mid-IR measurement *** GeOI single MRR exhibited an extinction ratio (ER) of 15.28 dB and an insertion loss (IL)of 1.204 dB,and the racetrack showed an ER of 22.77 dB and an IL of 0.627 ***,the free spectral range of the device was 5.29 nm,and the loaded Q factor of 94,528 (176,158 of intrinsic Q factor) was extracted by the nonlinear least squares *** believe this demonstration of our GeOI MRR offers a valuable opportunity to implement multipurpose devices such as optical sensors,switches,and filters in the mid-IR range.

关键词： resonator insulator MRR

Monolithic GaAs/Si V-groove depletion-type optical phase shifters integrated in a 300 mm Si photonics platform

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Photonics Research 2022年第6期10卷 1509-1516页

作者： YOUNGHYUN kim DIDIT YUDISTIRA BERNARDETTE KUNERT MARINA BARYSHNIKOVA REYNALD ALCOTTE CENK IBRAHIM OZDEMIR sanghyeon kim SEBASTIEN LARDENOIS PETER VERHEYEN JORIS VAN CAMPENHOUT MARIANNA PANTOUVAKI IMEC Heverlee B-3001Belgium Current address:Department of Photonics and Nanoelectronics BK21 FOUR ERICA-ACE CenterHanyang UniversityAnsan 15588Republic of Korea Current address:School of Electrical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea

We demonstrate monolithically integrated n-GaAs/p-Si depletion-type optical phase shifters fabricated on a 300 mm wafer-scale Si photonics *** measured the phase shifter performance using Mach–Zehnder modulators with the GaAs/Si optical phase shifters in both arms.A modulation efficiency of V_(π)L as low as 0.3 V·cm has been achieved,which is much lower compared to a carrier-depletion type Si optical phase shifter with pn *** propagation loss is relatively high at.5 d B∕mm,the modulator length can be reduced by the factor of.2 for the same optical modulation amplitude of a Si reference Mach–Zehnder modulator,owing to the high modulation efficiency of the shifters.

关键词： GaAs/Si modulator optical

Increasing sulfur utilization in lithium-sulfur batteries by a Co-MOF-74@MWCNT interlayer

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Journal of Energy Chemistry 2021年第9期30卷 186-193页

作者： SiHyeon Sung Byung Hyuk kim SeungTaek Lee sanghyeon Choi Woo Young Yoon Department of Materials Science and Engineering Korea University15GaAnam-dongSungbuk-GuSeoul 136-701Republic of Korea

To improve lithium-sulfur battery performance,Co-MOF-74 has been applied for the first time as an interlayer with multiwalled carbon nanotubes(MWCNTs).Co-MOF-74@MWCNT was synthesized using a solvothermal *** fabrication of Co-MOF-74@MWCNT was confirmed by scanning electron microscopy,X-ray diffraction,thermogravimetric analysis,and Brunauer-Emmett-Teller *** interlayer was fabricated using a filtration *** batteries were prepared using a CoMOF-74@MWCNT interlayer and an MWCNT interlayer and subsequently investigated via cyclic voltammetry ***-MOF-74 promotes a redox reaction and shows a small peak at 1.85 V.A symmetric and full cell test revealed that the Co-MOF-74@MWCNT cell enables a faster redox reaction and higher capacity than that of the MWCNT *** 15 cycles,the Co-MOF-74@MWCNT cell achieved a value of 1112 mAh g^(-1),which is 26% greater than that of the MWCNT cell(880 mAh g^(-1)) at 0.2 *** profile testing showed that the reason for the higher capacity of the Co-MOF-74@MWCNT cell is that it promotes the conversion of Li_(2)S_(2) to Li_(2)*** electrochemical analyses confirmed that the Co-MOF-74@MWCNT interlayer acts not only as a physical and chemical barrier but also promotes the transformation of Li_(2)S_(2) to Li_(2)S.

关键词： Li-S battery Shuttling effect Interlayer Sulfur utilization Co-MOF-74