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Label-free sensing of ultralow-weight molecules with all-dielectric metasurfaces supporting bound states in the continuum 被引量:15
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作者 SILVIA ROMANO GIANLUIGI ZITO +6 位作者 STEFANIA TORINO giuseppe calafiore ERIKA PENZO giuseppe COPPOLA STEFANO CABRINI IVO RENDINA VITO MOCELLA 《Photonics Research》 SCIE EI 2018年第7期726-733,共8页
The realization of an efficient optical sensor based on a photonic crystal metasurface supporting bound states in the continuum is reported. Liquids with different refractive indices, ranging from 1.4000 to 1.4480, ar... The realization of an efficient optical sensor based on a photonic crystal metasurface supporting bound states in the continuum is reported. Liquids with different refractive indices, ranging from 1.4000 to 1.4480, are infiltrated in a microfluidic chamber bonded to the sensing dielectric metasurface. A bulk liquid sensitivity of 178 nm/RIU is achieved, while a Q-factor of about 2000 gives a sensor figure of merit up to 445 in air at both visible and infrared excitations. Furthermore, the detection of ultralow-molecular-weight(186 Da) molecules is demonstrated with a record resonance shift of 6 nm per less than a 1 nm thick single molecular layer. The system exploits a normal-to-the-surface optical launching scheme, with excellent interrogation stability and demonstrates alignment-free performances, overcoming the limits of standard photonic crystals and plasmonic resonant configurations. 展开更多
关键词 高效光学传感器 折射率 理论研究 通讯技术
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Holographic planar lightwave circuit for on-chip spectroscopy 被引量:9
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作者 giuseppe calafiore Alexander Koshelev +6 位作者 Scott Dhuey Alexander Goltsov Pavel Sasorov Sergey Babin Vladimir Yankov Stefano Cabrini Christophe Peroz 《Light(Science & Applications)》 SCIE EI CAS 2014年第1期85-91,共7页
Computer-generated planar holograms are a powerful approach for designing planar lightwave circuits with unique properties.Digital planar holograms in particular can encode any optical transfer function with high cust... Computer-generated planar holograms are a powerful approach for designing planar lightwave circuits with unique properties.Digital planar holograms in particular can encode any optical transfer function with high customizability and is compatible with semiconductor lithography techniques and nanoimprint lithography.Here,we demonstrate that the integration of multiple holograms on a single device increases the overall spectral range of the spectrometer and offsets any performance decrement resulting from miniaturization.The validation of a high-resolution spectrometer-on-chip based on digital planar holograms shows performance comparable with that of a macrospectrometer.While maintaining the total device footprint below 2 cm2,the newly developed spectrometer achieved a spectral resolution of 0.15 nm in the red and near infrared range,over a 148 nm spectral range and 926 channels.This approach lays the groundwork for future on-chip spectroscopy and lab-on-chip sensing. 展开更多
关键词 digital planar holograms integrated optics nanofabrication NANOPHOTONICS SPECTROMETER
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