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Super-resolution Fluorescence Microscopy

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions

A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions

Published on: November 23, 2015

High-sensitivity and stable cellular fluorescence imaging by patterned silver nanocap arrays.

Teng Qiu¹, Jiang Jiang, Wenjun Zhang

¹Department of Physics, Southeast University, Nanjing 211189, China. tqiu@seu.edu.cn

ACS Applied Materials & Interfaces

|July 30, 2010

Summary

Patterned silver nanocap arrays (PSNAs) significantly boost cellular fluorescence imaging sensitivity and stability. These nanostructures enhance fluorescence signals eightfold, offering a promising advancement for biological imaging applications.

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Area of Science:

Nanotechnology
Biophotonics
Materials Science

Background:

Cellular fluorescence imaging is crucial for biological research.
Conventional imaging methods face limitations in sensitivity and photostability.
Developing novel nanomaterials can overcome these limitations.

Purpose of the Study:

To investigate the efficacy of patterned silver nanocap arrays (PSNAs) for enhanced cellular fluorescence imaging.
To analyze the microstructural and optical properties of PSNAs.
To evaluate the impact of PSNAs on fluorescence signal intensity and photostability.

Main Methods:

Preparation of PSNAs on porous anodic alumina templates via a simple coating technique.
Microstructural analysis using electron microscopy.
Surface-enhanced Raman scattering (SERS) mapping.
Finite difference time domain (FDTD) simulations.
Cellular labeling with phalloidin-fluorescein isothiocyanate (P-FITC) and imaging on PSNAs and glass substrates.

Main Results:

PSNAs exhibit evenly distributed hot spots, crucial for signal enhancement.
An 8-fold increase in fluorescence signal intensity was observed for P-FITC labeled cytoskeletons on PSNAs compared to glass.
Dramatic improvement in photostability of the fluorescent signals.
Spectral analysis indicated plasmon resonance energy transfer (PRET) and plasmonic antenna effects contributing to signal enhancement.

Conclusions:

PSNAs offer a simple yet effective platform for significantly enhancing cellular fluorescence imaging.
The observed improvements in sensitivity and photostability are attributed to the unique plasmonic properties of PSNAs.
PSNAs represent a promising tool for advanced biological and biomedical imaging applications.