nanohole array
Recently Published Documents


TOTAL DOCUMENTS

210
(FIVE YEARS 59)

H-INDEX

28
(FIVE YEARS 5)

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhiliang Zhang ◽  
Feng Zhao ◽  
Renxian Gao ◽  
Chih-Yu Jao ◽  
Churong Ma ◽  
...  

Abstract Plasmonic sensors exhibit tremendous potential to accomplish real-time, label-free, and high-sensitivity biosensing. Gold nanohole array (GNA) is one of the classic plasmonic nanostructures that can be readily fabricated and integrated into microfluidic platforms for a variety of applications. Even though GNA has been widely studied, new phenomena and applications are still emerging continuously expanding its capabilities. In this article, we demonstrated narrow-band high-order resonances enabled by Rayleigh anomaly in the nanohole arrays that are fabricated by scalable colloidal lithography. We fabricated large-area GNAs with different hole diameters, and investigated their transmission characteristics both numerically and experimentally. We showed that mode hybridization between the plasmon mode of the nanoholes and Rayleigh anomaly of the array could give rise to high-quality decapole resonance with a unique nearfield profile. We experimentally achieved a refractive index sensitivity, i.e., RIS up to 407 nm/RIU. More importantly, we introduced a spectrometer-free refractive index sensing based on lens-free smartphone imaging of GNAs with (intensity) sensitivity up to 137%/RIU. Using this platform, we realized the label-free detection of BSA molecules with concentration as low as 10−8 M. We believe our work could pave the way for highly sensitive and compact point-of-care devices with cost-effective and high-throughput plasmonic chips.


2022 ◽  
Author(s):  
Shadman Shahid ◽  
Shahed -E- Zumrat ◽  
Muhammad Anisuzzaman Talukder

Plasmonic lasers offer great potential for cutting-edge, disruptive applications. However, they suffer from a high loss in metal, lack of spatial coherence in the near-field, and divergent far-field emission. The...


Plasmonics ◽  
2021 ◽  
Author(s):  
Mahdi Javidnasab ◽  
Saeid Khesali Azadi ◽  
Majid Ahmadpouri Legha ◽  
Hamid Naghshara

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Alfredo Franco ◽  
Verónica Vidal ◽  
Marcos Gómez ◽  
Olga Gutiérrez ◽  
María Martino ◽  
...  

Abstract Developing a simple, fast, and label-free method for discrimination between live cancer cells and normal cells in biological samples still remains a challenge. Here, a system is described that fulfills these features to analyze individual living cells. The system consists of a gold nanohole array biosensor plus a microscope optical design to isolate the spectral response of a single cell. It is demonstrated that differences in the spectral behavior between tumor (colorectal cancer cell lines and primary cells from colorectal cancer tissue) and non-tumor cells (peripheral blood mononuclear cells, skin fibroblasts and colon epithelial cells) are influenced by the actin cortex, which lies within the short penetration depth of the surface plasmon electromagnetic field. The efficacy of this system was assessed by the analysis of about one thousand single cells showing the highest discrimination capacity between normal colon epithelial cells and colorectal cancer cells from surgical specimens, with values of sensitivity and specificity ranging 80–100% and 87–100%, respectively. It is also demonstrated that cell discrimination capacity of the system is highly reduced by disrupting the formation of actin cortex. This plasmonic system may find wide applications in biomedicine and to study key cellular processes that involve the actin cortex, including proliferation, differentiation, and migration.


Plasmonics ◽  
2021 ◽  
Author(s):  
Suxia Xie ◽  
Song Xie ◽  
Zhijian Li ◽  
Guang Tian ◽  
Jie Zhan ◽  
...  

Author(s):  
Mohsin Habib ◽  
Ibrahim Issah ◽  
Daria Briukhanova ◽  
Alireza R. Rashed ◽  
Humeyra Caglayan

2021 ◽  
pp. 127345
Author(s):  
Kai Zhao ◽  
Ting-Hui Xiong ◽  
Yu-Zheng Yuan ◽  
Meng-Dong He ◽  
Kai-Jun Wang ◽  
...  
Keyword(s):  

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Donato Conteduca ◽  
Isabel Barth ◽  
Giampaolo Pitruzzello ◽  
Christopher P. Reardon ◽  
Emiliano R. Martins ◽  
...  

AbstractDielectric metasurfaces support resonances that are widely explored both for far-field wavefront shaping and for near-field sensing and imaging. Their design explores the interplay between localised and extended resonances, with a typical trade-off between Q-factor and light localisation; high Q-factors are desirable for refractive index sensing while localisation is desirable for imaging resolution. Here, we show that a dielectric metasurface consisting of a nanohole array in amorphous silicon provides a favourable trade-off between these requirements. We have designed and realised the metasurface to support two optical modes both with sharp Fano resonances that exhibit relatively high Q-factors and strong spatial confinement, thereby concurrently optimizing the device for both imaging and biochemical sensing. For the sensing application, we demonstrate a limit of detection (LOD) as low as 1 pg/ml for Immunoglobulin G (IgG); for resonant imaging, we demonstrate a spatial resolution below 1 µm and clearly resolve individual E. coli bacteria. The combined low LOD and high spatial resolution opens new opportunities for extending cellular studies into the realm of microbiology, e.g. for studying antimicrobial susceptibility.


Optik ◽  
2021 ◽  
pp. 167449
Author(s):  
Suxia Xie ◽  
Song Xie ◽  
Zhijian Li ◽  
Zhuoling Li ◽  
Guang Tian ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document