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optical polarization response at gold nanosheet edges probed by scanning near-field optical microscopy

Chinese Physics B 2018年第8期27卷 554-558页

作者： Zhuan-Fang Bi Mu Yang Guang-Yi Shang Department of Applied Physics Key Laboratory of Mircro-nano Measurement-manipulation and Physics（Ministry of Education）Beihang UniversityBeijing 100191China Beijing Institute of Space Mechanics and Electronics CASTBeijing 100191China

optical properties of metallic edge-like structures known as knife-edges are a topic of interest and possess potential applications in enhanced Raman scattering, optical trapping, etc. In this work, we investigate the near-field optical polar- ization response at the edge of a triangular gold nanosheet, which is synthesized by a wet chemical method. A homemade scanning near-field optical microscope （SNOM） in collection mode is adopted, which is able to accurately locate its probe at the edge during experiments. An uncoated straight fiber probe is used in the SNOM, because it s611 preserves the prop- erty of light polarization though it has the depolarization to some extent. By comparing near-field intensities at the edge and glass substrate, detected in different polarization directions of incident light, the edge-induced depolarization is found, which is supported by the finite differential time domain （FDTD） simulated results. The depolarized phenomenon in the near-field is similar to that in the far-field.

关键词： nanosheet scanning near-field optical microscopy edge effect depotarization

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Imaging of apoptotic HeLa cells by using scanning near-field optical microscopy

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Progress in Natural Science:Materials International 2002年第8期 19-24页

作者： Peter von BLANCKENHAGEN Germany Institute of Nanotechnology Karlsruhe D-76021 Research Center Karlsruhe

By using scanning near-field optical microscopy (SNOM), HeLa cells in apoptosis process are imaged with a higher optical resolution beyond the diffraction limit. Since SNOM provides both topographic and transmitted light intensity information of a cell, it can correlate the structural characteristics and optical properties with the spatial position of the apoptotic cells. Wavelength imaging by using near-field spectroscopy shows that there is a great difference in light propagation and absorption in the cell. This unique technique can be applied to the super high resolution imaging of different components in the cell. The observations by near-field optical imaging and near-field spectroscopy indicate an inhomogeneous aggregation of the inner structure in the apoptotic HeLa cells and the change of transmission intensity of light with the apoptosis status.

关键词： scanning near-field optical microscopy HeLa cell apoptosis spectrum imaging tapping mode.

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Review： Tip-based vibrational spectroscopy for nanoscale analysis of emerging energy materials

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Frontiers in Energy 2018年第1期12卷 43-71页

作者： Amun JARZEMBSKI Cedric SHASKEY Keunhan PARK Department of Mechanical Engineering University of Utah Salt LakeCity UT 84112 USA

Vibrational spectroscopy is one of the key instrumentations that provide non-invasive investigation of structural and chemical composition for both organic and inorganic materials. However, diffraction of light funda- mentally limits the spatial resolution of far-field vibrational spectroscopy to roughly half the wavelength. In this article, we thoroughly review the integration of atomic force microscopy （AFM） with vibrational spectroscopy to enable the nanoscale characterization of emerging energy materials, which has not been possible with far-field optical techniques. The discussed methods utilize the AFM tip as a nanoscopic tool to extract spatially resolved electronic or molecular vibrational resonance spectra of a sample illuminated by a visible or infrared （IR） light source. The absorption of light by electrons or individual functional groups within molecules leads to changes in the sample＇s thermal response, optical scattering, and atomic force interactions, all of which can be readily probed by an AFM tip. For example, photothermal induced resonance （PTIR） spectroscopy methods measure a sample＇s local thermal expansion or temperature rise. Therefore, they use the AFM tip as a thermal detector to directly relate absorbed IR light to the thermal response of a sample. optical scattering methods based on scanning near-field optical microscopy （SNOM） correlate the spectrum of scattered near-field light with molecular vibrational modes. More recently, photo-induced force microscopy （PiFM） has been developed to measure the change of the optical force gradient due to the light absorption by molecular vibrational resonances using AFM＇s superb sensitivity in detecting tip-sample force interactions. Such recent efforts successfully breech the diffraction limit of light to provide nanoscale spatial resolution of vibrational spectroscopy,which will become a critical technique for characterizing novel energy materials.

关键词： vibrational spectroscopy atomic force micro-scopy photo-thermal induced resonance scanning near-field optical microscopy tip-enhanced Raman spectro-scopy photo-induced force microscopy molecular reso-nances surface phonon polaritons energy materials

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Nanobridged rhombic antennas supporting both dipolar and high-order plasmonic modes with spatially superimposed hotspots in the mid-infrared

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Opto-Electronic Advances 2021年第12期4卷 1-14页

作者： En-Ming You Yiqin Chen Jun Yi Zhao-Dong Meng Qian Chen Song-Yuan Ding Huigao Duan Martin Moskovits Zhong-Qun Tian State Key Laboratory of Physical Chemistry of Solid Surfaces Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China National Engineering Research Center for High Efficiency Grinding College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Department of Chemistry and Biochemistry University of CaliforniaSanta BarbaraCalifornia93106USA.

Mid-infrared antennas(MIRAs)support highly-efficient optical resonance in the infrared,enabling multiple applications,such as surface-enhanced infrared absorption(SEIRA)spectroscopy and ultrasensitive mid-infrared ***,most MIRAs such as dipolar-antenna structures support only narrow-band dipolar-mode resonances while high-order modes are usually too weak to be observed,severely limiting other useful applications that broadband resonances make *** this study,we report a multiscale nanobridged rhombic antenna(NBRA)that supports two dominant reson-ances in the MIR,including a charge-transfer plasmon(CTP)band and a bridged dipolar plasmon(BDP)band which looks like a quadruple *** assignments are evidenced by scattering-type scanning near-field optical micro-scopy(s-SNOM)imaging and electromagnetic *** high-order mode only occurs with nanometer-sized bridge(nanobridge)linked to the one end of the rhombic arm which mainly acts as the inductance and the resistance by the circuit ***,the main hotspots associated with the two resonant bands are spatially superimposed,en-abling boosting up the local field for both bands by multiscale *** large field enhancements,multiband detec-tion with high sensitivity to a monolayer of molecules is achieved when using *** work provides a new strategy possible to activate high-order modes for designing multiband MIRAs with both nanobridges and nanogaps for such MIR applications as multiband SEIRAs,IR detectors,and beam-shaping of quantum cascade lasers in the future.

关键词： optical antenna charge transfer plasmon multiband resonances scanning near-field optical microscopy surface-enhanced infrared spectroscopy

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