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Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
Published on: February 9, 2012
Spectrally resolved fluorescence lifetime imaging microscope using tunable bandpass filters.
Hyeong-Jun Jeong1, Jin-Woo Ahn, Dukho Do
1Department of Mechanical Engineering, KAIST, Daejeon 305-701, South Korea.
The Review of Scientific Instruments
|October 2, 2012
Summary
A novel spectral fluorescence lifetime imaging microscope (SLIM) uses angle-tuned bandpass filters (ATBFs) for improved spectral resolution. This advanced FLIM system enhances image contrast and lifetime analysis accuracy.
Area of Science:
- Optics and Photonics
- Biomedical Imaging
- Spectroscopy
Background:
- Fluorescence Lifetime Imaging Microscopy (FLIM) is a powerful technique for analyzing biological samples.
- Traditional FLIM systems often lack precise spectral resolution, limiting detailed analysis.
- The development of spectrally resolved FLIM is crucial for advanced applications.
Purpose of the Study:
- To design and implement a simple spectral fluorescence lifetime imaging microscope (SLIM) using angle-tuned bandpass filters (ATBFs).
- To evaluate the performance of ATBFs in terms of transmission, spectral bandwidth, and wavelength selectivity.
- To demonstrate the capability of the SLIM system for spectrally resolved FLIM imaging and compare its performance with conventional FLIM.
Main Methods:
- Designed a SLIM system incorporating a tunable Fabry-Perot filter (ATBF) where transmission wavelength varies with the angle of light incidence.
- Conducted feasibility tests on the ATBF, assessing its transmission efficiency and spectral bandwidth (20 nm) across different angles.
- Implemented dual ATBFs in series to achieve adjustable spectral bandwidths down to 4 nm within the FLIM detection system.
Main Results:
- The angle-tuned bandpass filter (ATBF) demonstrated high transmission and a constant spectral bandwidth of 20 nm irrespective of the angle of incidence.
- Using two ATBFs in series allowed for adjustable spectral bandwidths, reaching as narrow as 4 nm.
- Spectrally resolved FLIM images obtained with the SLIM system exhibited higher accuracy in lifetime distribution analysis and improved image contrast compared to original FLIM images.
Conclusions:
- The developed SLIM microscope, utilizing dual ATBFs, successfully provides spectrally resolved FLIM images with enhanced accuracy and contrast.
- The angle-tuned bandpass filter technology offers excellent wavelength selectivity, making the SLIM system suitable for diverse applications.
- Potential applications include FLIM-based Förster resonant energy transfer (FRET) imaging and autofluorescence imaging, expanding the utility of FLIM techniques.
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