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Guided resonance in negative index photonic crystals: a new approach

Light(Science & Applications) 2014年第1期3卷 365-369页

作者： Silvia Romano Stefano Cabrini ivo rendina Vito Mocella CNR-IMM-Unita di Napoli 80131 NapoliItaly Molecular Foundry Lawrence Berkeley National LaboratoryBerkeleyCAUSA

The behavior of a negative refraction photonic crystal slab irradiated with out-of-plane incident beam is an unexplored *** such an experimental configuration,guided mode resonance appears in the reflection *** show that,in this case,the light coupled inside the photonic crystal is backpropagating.A relationship with the negative index properties is established using a new approach in which the guided resonance is recovered by modeling the photonic crystal layer with a simple Lorentz resonator using the Fresnel reflection formula.

关键词： diffraction gratings guided mode resonance negative index photonic crystals

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Ellipsometric determination of permittivity in a negative index photonic crystal metamaterial

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Light(Science & Applications) 2012年第1期1卷 1-5页

作者： Principia Dardano Massimo Gagliardi ivo rendina Stefano Cabrini Vito Mocella Institute for microelectronics and microsystems National Council of ResearchDepartment of NaplesNaples 80131Italy Molecular Foundry Lawrence Berkeley National LaboratoryBerkeleyCAUSA

In this work,we present the first experimental evidence of negative dielectric susceptibility in a two-dimensional silicon photonic crystal(PhC)with negative refractive index *** the frequency range in which the effective refractive index neff is equal to 21,the incident light couples efficiently to the guided modes in the top surface layer of the PhC *** modes resemble surface plasmon polariton *** finding was confirmed by ellipsometric measurements,demonstrating the isotropy of the PhC *** negative index PhC materials may be of use in biosensing applications.

关键词： diffraction gratings metamaterials photonic crystals

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Label-free sensing of ultralow-weight molecules with all-dielectric metasurfaces supporting bound states in the continuum

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Photonics Research 2018年第7期6卷 726-733页

作者： SILVIA ROMANO GIANLUIGI ZITO STEFANIA TORINO GIUSEPPE CALAFIORE ERIKA PENZO GIUSEPPE COPPOLA STEFANO CABRINI ivo rendina VITO MOCELLA Institute for Microelectronics and Microsystems Unit of Naples National Council of Research Institute of Protein Biochemistry National Council of Research Lawrence Berkeley National Laboratory Molecular Foundry Division

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.

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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