Waveguide-integrated mid-infrared(MIR)photodetectors are pivotal components for the development of molecular spectroscopy applications,leveraging mature photonic integrated circuit(PIC)technologies.Despite various str...Waveguide-integrated mid-infrared(MIR)photodetectors are pivotal components for the development of molecular spectroscopy applications,leveraging mature photonic integrated circuit(PIC)technologies.Despite various strategies,critical challenges still remain in achieving broadband photoresponse,cooling-free operation,and large-scale complementary-metal-oxide-semiconductor(CMOS)-compatible manufacturability.To leap beyond these limitations,the bolometric effect–a thermal detection mechanism–is introduced into the waveguide platform.More importantly,we pursue a free-carrier absorption(FCA)process in germanium(Ge)to create an efficient light-absorbing medium,providing a pragmatic solution for full coverage of the MIR spectrum without incorporating exotic materials into CMOS.Here,we present an uncooled waveguide-integrated photodetector based on a Ge-on-insulator(Ge-OI)PIC architecture,which exploits the bolometric effect combined with FCA.Notably,our device exhibits a broadband responsivity of 28.35%/mW across 4030–4360 nm(and potentially beyond),challenging the state of the art,while achieving a noise-equivalent power of 4.03×10^(−7) W/Hz^(0.5) at 4180 nm.We further demonstrate label-free sensing of gaseous carbon dioxide(CO_(2))using our integrated photodetector and sensing waveguide on a single chip.This approach to room-temperature waveguide-integrated MIR photodetection,harnessing bolometry with FCA in Ge,not only facilitates the realization of fully integrated lab-on-a-chip systems with wavelength flexibility but also provides a blueprint for MIR PICs with CMOS-foundry-compatibility.展开更多
We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring res...We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring resonators for tuning,the laser achieves a tuning range of 25 nm,precise adjustments below 0.1 nm,and a side-mode suppression ratio of 40 d B.This advancement contributes to the progress in photonic integrated circuits beyond the telecommunication wavelength range,offering scalable and cost-effective solutions for enhanced spectroscopic systems within the 2.0-μm wavelength range.展开更多
基金supported by the National Research Foundation of Korea(NRF)(2023R1A2C2002777,RS-2024-00407767)the KIST Institutional Program(2E33052)the BK21 FOUR.
文摘Waveguide-integrated mid-infrared(MIR)photodetectors are pivotal components for the development of molecular spectroscopy applications,leveraging mature photonic integrated circuit(PIC)technologies.Despite various strategies,critical challenges still remain in achieving broadband photoresponse,cooling-free operation,and large-scale complementary-metal-oxide-semiconductor(CMOS)-compatible manufacturability.To leap beyond these limitations,the bolometric effect–a thermal detection mechanism–is introduced into the waveguide platform.More importantly,we pursue a free-carrier absorption(FCA)process in germanium(Ge)to create an efficient light-absorbing medium,providing a pragmatic solution for full coverage of the MIR spectrum without incorporating exotic materials into CMOS.Here,we present an uncooled waveguide-integrated photodetector based on a Ge-on-insulator(Ge-OI)PIC architecture,which exploits the bolometric effect combined with FCA.Notably,our device exhibits a broadband responsivity of 28.35%/mW across 4030–4360 nm(and potentially beyond),challenging the state of the art,while achieving a noise-equivalent power of 4.03×10^(−7) W/Hz^(0.5) at 4180 nm.We further demonstrate label-free sensing of gaseous carbon dioxide(CO_(2))using our integrated photodetector and sensing waveguide on a single chip.This approach to room-temperature waveguide-integrated MIR photodetection,harnessing bolometry with FCA in Ge,not only facilitates the realization of fully integrated lab-on-a-chip systems with wavelength flexibility but also provides a blueprint for MIR PICs with CMOS-foundry-compatibility.
基金King Abdullah University of Science and Technology(RFS-TRG2024-6196,RFS-OFP2023-5558,FCC/1/5939)。
文摘We present hybrid tunable lasers at 2.0-μm wavelength,seamlessly integrated within silicon photonic circuits for advanced biomedical applications.Leveraging III/V semiconductor materials for gain and silicon ring resonators for tuning,the laser achieves a tuning range of 25 nm,precise adjustments below 0.1 nm,and a side-mode suppression ratio of 40 d B.This advancement contributes to the progress in photonic integrated circuits beyond the telecommunication wavelength range,offering scalable and cost-effective solutions for enhanced spectroscopic systems within the 2.0-μm wavelength range.
