scholarly journals Surface Enhanced Infrared Characterization Using Disordered Slit-Antenna Arrays for the Detection of Electrodeposited Cytochrome C

Plasmonics ◽  
2021 ◽  
Author(s):  
Gaspar Armelles ◽  
Alfonso Cebollada ◽  
Daniel G. Cava ◽  
Julia Alvarez-Malmagro ◽  
Marisela Vélez
Keyword(s):  
Cytochrome C ◽  
Antenna Arrays ◽  
Plasmon Resonance ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Electrochemical Studies ◽  
Absorption Bands ◽  
Reflectivity Spectra ◽  
Surface Enhanced ◽  
Slit Length

AbstractAn approach which allows both electrochemical studies and surface enhanced infrared characterization of electrodeposited Cytochrome C is presented. This approach is based on in-plane disordered arrays of resonant slits engraved in Au substrates using focused ion beam. For light-polarized perpendicular to the slit, the reflectivity spectra of the slit arrays show dips related to the excitation of the slit plasmon resonance, whose position depends on the slit length. Due to the presence of the continuous Au layer around the slits, the very same substrates can be used to perform electrochemical studies. By varying the slit length, we have tuned the plasmon resonance to match the absorption bands of electrodeposited Cytochrome C, demonstrating the detection of minute amounts of this protein, all the way down to a single monolayer.

Dynamic Plasmon Resonance Tuning for Surface Enhanced Sensing

2019 ◽  
Vol 19 (6) ◽  
pp. 3643-3646
Author(s):  
Zhenhe Ma ◽  
Yafei Li ◽  
Qiongchan Gu ◽  
Sheng Hu ◽  
Yu Ying ◽  
...  
Keyword(s):  
Plasmon Resonance ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Ion Beam Lithography ◽  
Surface Enhanced ◽  
Resonance Tuning

We report on fabricating plasmonic nanorod crystals using focused ion beam lithography. We first demonstrate manipulating the profiles of nanorods perpendicularly aligned with the substrate. Then we show accurate control of nanorod outlines can be achieved. We also show that it is feasible to manufacture nanorods obliquely aligned with the substrate. Tunable plasmon resonance can be realized with different tilting angles and geometries. Our approach may find important applications in plasmon-assisted sensing and surface enhanced spectroscopy.

scholarly journals Design of Surface Enhanced Raman Scattering (SERS) Nanosensor Array

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5123
Author(s):  
Yaakov Mandelbaum ◽  
Raz Mottes ◽  
Zeev Zalevsky ◽  
David Zitoun ◽  
Avi Karsenty
Keyword(s):  
Raman Scattering ◽  
Real Time ◽  
Chemical Reaction ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Surface Enhanced Raman Scattering ◽  
Spatially Resolved ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

An advanced Surface-Enhanced Raman Scattering (SERS) Nanosensor Array, dedicated to serve in the future as a pH imager for the real-time detection of chemical reaction, is presented. The full flow of elementary steps—architecture, design, simulations, fabrication, and preliminary experimental results of structural characterization (Focused Ion Beam (FIB), TEM and SEM)—show an advanced SERS pixel array that is capable of providing spatially resolved measurements of chemical pH in a fluid target that became more than desirable in this period. Ultimately, the goal will be to provide real-time monitoring of a chemical reaction. The pixels consist of a nanostructured substrate composed of an array of projections or cavities. The shape of the nanostructures and the thickness of the metallic (Ag or Au) layer can be tuned to give maximal enhancement at the desired wavelength. The number and arrangement of nanostructures is optimized to obtain maximal responsivity.

Optical Sensing Based on Localized Surface Plasmon Resonance

2010 ◽  
Vol 447-448 ◽  
pp. 584-589
Author(s):  
Shao Li Zhu ◽  
Wei Zhou
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Localized Surface Plasmon Resonance ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Localized Surface Plasmon ◽  
Geometrical Parameters ◽  
Full Potential ◽  
Nanostructure Array

Localized surface plasmon resonance (LSPR)-based nano-biosensors are of great interest in various applications such as environmental protection, biotechnology, and food safety. It is well known that types of materials and shapes of the nanostructures have significant influence on the sensitivity and the resolution in nanobiosensor application field. The conventional nanostructure array used for nanobiosensor is fabricated by chemical method, so it is difficult to control the shape and the inter-particle space. Focused ion beam (FIB) can be used to produce any shapes with a very high level of regularity and reproducibility. This makes it possible to optimize the shape of nanostructures and the inter-particle distance to achieve the full potential application in nanobiosensor. Using focused ion beam (FIB) nanofabrication method, we have fabricated the regularly shaped hybrid Ag-Au nanostructures distributed on the surface of the glass substrate. Gold-coating was used to tuning the optical characteristics of the silver nanostructure array. Discrete dipole approximation (DDA) method was used to optimize geometrical parameters of the hybrid Ag-Au nanostructures. The design and experiment results show that the sensitivity and resolution have been improved considerably compared to the chemically synthesized nanostructures. The nano-biosensor demonstrates the potential applications in monitoring, detection and identification of biological agents, and characterization of intermolecular interactions.

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