scholarly journals Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Hai Hu ◽  
Xiaoxia Yang ◽  
Feng Zhai ◽  
Debo Hu ◽  
Ruina Liu ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Far Field ◽  
Graphene Plasmons

Infrared spectroscopy with tunable graphene plasmons (Presentation Recording)

2015 ◽  
Author(s):  
Andrea Marini ◽  
Iván Silveiro ◽  
Javier Garcia de Abajo
Keyword(s):  
Infrared Spectroscopy ◽  
Graphene Plasmons

Identification of Large Isotope Anomalies in Quartz by Infrared Spectroscopy

2019 ◽  
Vol 73 (7) ◽  
pp. 767-773
Author(s):  
Ryan C. Ogliore ◽  
Cosette Dwyer ◽  
Michael J. Krawczynski ◽  
Hélène Couvy ◽  
Max Eisele ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Isotope Composition ◽  
Fourier Transform Infrared ◽  
Spectroscopic Technique ◽  
Far Field ◽  
Ft Ir ◽  
Ir Spectroscopic ◽  
Quartz Grains

We report an infrared (IR) spectroscopic technique to detect quartz grains with large isotope anomalies. We synthesized isotopically doped quartz and used Fourier transform infrared spectroscopy (FT-IR) in two different instruments: a traditional far-field instrument and a neaSpec nanoFT-IR, to quantify the shift in the peak of the Si–O stretch near 780 cm−1 as a function of isotope composition, and the uncertainty in this shift. From these measurements, we estimated the minimum detectable isotope anomaly using FT-IR. The described technique can be used to nondestructively detect very small (30 nm) presolar grains. In particular, supernova grains, which can have very large isotope anomalies, are detectable by this method.

scholarly journals Enhanced Molecular Infrared Spectroscopy Employing Bilayer Graphene Acoustic Plasmon Resonator

Biosensors ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 431
Author(s):  
Chunchao Wen ◽  
Jie Luo ◽  
Wei Xu ◽  
Zhihong Zhu ◽  
Shiqiao Qin ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Structural Information ◽  
Strong Field ◽  
Field Enhancement ◽  
Infrared Region ◽  
Bilayer Graphene ◽  
Plasmonic Sensors ◽  
Protein Molecules ◽  
Molecular Infrared Spectroscopy ◽  
Graphene Plasmons

Graphene plasmon resonators with the ability to support plasmonic resonances in the infrared region make them a promising platform for plasmon-enhanced spectroscopy techniques. Here we propose a resonant graphene plasmonic system for infrared spectroscopy sensing that consists of continuous graphene and graphene ribbons separated by a nanometric gap. Such a bilayer graphene resonator can support acoustic graphene plasmons (AGPs) that provide ultraconfined electromagnetic fields and strong field enhancement inside the nano-gap. This allows us to selectively enhance the infrared absorption of protein molecules and precisely resolve the molecular structural information by sweeping graphene Fermi energy. Compared to the conventional graphene plasmonic sensors, the proposed bilayer AGP sensor provides better sensitivity and improvement of molecular vibrational fingerprints of nanoscale analyte samples. Our work provides a novel avenue for enhanced infrared spectroscopy sensing with ultrasmall volumes of molecules.

scholarly journals Harnessing ultraconfined graphene plasmons to probe the electrodynamics of superconductors

2021 ◽  
Vol 118 (4) ◽  
pp. e2012847118
Author(s):  
A. T. Costa ◽  
P. A. D. Gonçalves ◽  
D. N. Basov ◽  
Frank H. L. Koppens ◽  
N. Asger Mortensen ◽  
...  
Keyword(s):  
Near Field ◽  
Far Field ◽  
Purcell Effect ◽  
Near Field Optics ◽  
Higgs Mode ◽  
Graphene Plasmons ◽  
Quantum Emitters

We show that the Higgs mode of a superconductor, which is usually challenging to observe by far-field optics, can be made clearly visible using near-field optics by harnessing ultraconfined graphene plasmons. As near-field sources we investigate two examples: graphene plasmons and quantum emitters. In both cases the coupling to the Higgs mode is clearly visible. In the case of the graphene plasmons, the coupling is signaled by a clear anticrossing stemming from the interaction of graphene plasmons with the Higgs mode of the superconductor. In the case of the quantum emitters, the Higgs mode is observable through the Purcell effect. When combining the superconductor, graphene, and the quantum emitters, a number of experimental knobs become available for unveiling and studying the electrodynamics of superconductors.

scholarly journals Far‐Field Excitation of Acoustic Graphene Plasmons with a Metamaterial Absorber

2020 ◽  
pp. 2000066
Author(s):  
Chunchao Wen ◽  
Xingqiao Chen ◽  
Jianfa Zhang ◽  
Wei Xu ◽  
Jie Luo ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Far Field ◽  
Graphene Plasmons ◽  
Field Excitation

Resolved Infrared Spectroscopy of Aqueous Molecules Employing Tunable Graphene Plasmons in an Otto Prism

2020 ◽  
Vol 92 (23) ◽  
pp. 15370-15378 ◽  
Author(s):  
Jinpeng Nong ◽  
Wei Wei ◽  
Guilian Lan ◽  
Peng Luo ◽  
Caicheng Guo ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Graphene Plasmons

Possible applications of fraunhofer holography in high resolution electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 222-223 ◽  
Author(s):  
N. Bonnet ◽  
M. Troyon ◽  
P. Gallion
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Transfer Function ◽  
Radiation Damage ◽  
High Resolution Electron Microscopy ◽  
Far Field ◽  
Field Region ◽  
Crystalline Materials ◽  
Resolution Electron ◽  
The Ideal

Two main problems in high resolution electron microscopy are first, the existence of gaps in the transfer function, and then the difficulty to find complex amplitude of the diffracted wawe from registered intensity. The solution of this second problem is in most cases only intended by the realization of several micrographs in different conditions (defocusing distance, illuminating angle, complementary objective apertures…) which can lead to severe problems of contamination or radiation damage for certain specimens.Fraunhofer holography can in principle solve both problems stated above (1,2). The microscope objective is strongly defocused (far-field region) so that the two diffracted beams do not interfere. The ideal transfer function after reconstruction is then unity and the twin image do not overlap on the reconstructed one.We show some applications of the method and results of preliminary tests.Possible application to the study of cavitiesSmall voids (or gas-filled bubbles) created by irradiation in crystalline materials can be observed near the Scherzer focus, but it is then difficult to extract other informations than the approximated size.

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