Search | Engineering

Subscribe Submit

Home Journals Focus Achievement Fronts About Us 中文版

Resource Type

Journal Article 3

Year

2022 1

2020 1

2018 1

Keywords

Metasurface 2

Surface plasmon polaritons 2

Digital coding 1

Effective medium theory 1

Information 1

Metamaterial 1

On-chip biosensing 1

Programmable 1

Rainbow trapping 1

Super-resolution displacement 1

atomic force microscopy 1

energy materials 1

molecular resonances 1

photo-induced force microscopy 1

photo-thermal induced resonance 1

scanning near-field optical microscopy 1

surface phonon polaritons 1

tip-enhanced Raman spectroscopy 1

vibrational spectroscopy 1

open ︾

Search scope:

排序： Display mode:

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

Amun JARZEMBSKI, Cedric SHASKEY, Keunhan PARK

Frontiers in Energy 2018, Volume 12, Issue 1, Pages 43-71 doi: 10.1007/s11708-018-0524-8

Abstract: 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 fundamentally 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.

Keywords： tip-enhanced Raman spectroscopy photo-induced force microscopy molecular resonances surface phonon polaritons

HTML PDF Collect

Microwave metamaterials: from exotic physics to novel information systems Review Articles

Rui-yuan WU, Tie-jun CUI

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1, Pages 4-26 doi: 10.1631/FITEE.1900465

Abstract: In particular, we briefly introduce spoof surface plasmon polaritons and their applications in microwave

Keywords： Metamaterial Effective medium theory Metasurface Surface plasmon polaritons Digital coding Programmable

HTML PDF Collect

Super-Resolution Displacement Spectroscopic Sensing over a Surface “Rainbow” Article

Lyu Zhou, Nan Zhang, Chang Chieh Hsu, Matthew Singer, Xie Zeng, Yizheng Li, Haomin Song, Josep Jornet, Yun Wu, Qiaoqiang Gan

Engineering 2022, Volume 17, Issue 10, Pages 75-81 doi: 10.1016/j.eng.2022.03.018

Abstract:

Subwavelength manipulation of light waves with high precision can enable new and exciting applications in spectroscopy, sensing, and medical imaging. For these applications, miniaturized spectrometers are desirable to enable the on-chip analysis of spectral information. In particular, for imaging-based spectroscopic sensing mechanisms, the key challenge is to determine the spatial-shift information accurately (i.e., the spatial displacement introduced by wavelength shift or biological or chemical surface binding), which is similar to the challenge presented by super-resolution imaging. Here, we report a unique “rainbow” trapping metasurface for on-chip spectrometers and sensors. Combined with super-resolution image processing, the low-setting 4× optical microscope system resolves a displacement of the resonant position within 35 nm on the plasmonic rainbow trapping metasurface with a tiny area as small as 0.002 mm². This unique feature of the spatial manipulation of efficiently coupled rainbow plasmonic resonances reveals a new platform for miniaturized on-chip spectroscopic analysis with a spectral resolution of 0.032 nm in wavelength shift. Using this low-setting 4× microscope imaging system, we demonstrate a biosensing resolution of 1.92 × 10⁹ exosomes per milliliter for A549-derived exosomes and distinguish between patient samples and healthy controls using exosomal epidermal growth factor receptor (EGFR) expression values, thereby demonstrating a new on-chip sensing system for personalized accurate bio/chemical sensing applications.

Keywords： Rainbow trapping Metasurface Surface plasmon polaritons Super-resolution displacement On-chip biosensing