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Lifetime Imaging Techniques for
Optical Microscopy

Contents

Introduction

3

Biological Applications of Lifetime Techniques

3

Fluorescence Quenching

3

Resonance Energy Transfer

4

Separation of Different Chromophores

5

Diffusion in Cells

5

Microscopy Techniques

5

Wide-Field Fluorescence Microscopy

5

Laser Scanning Microscopy

6

Optical Near-Field Microscopy

7

Light Sources

7

Titanium-Sapphire Lasers

7

Frequency Doubled Titanium-Sapphire Lasers

8

Fibre Lasers

8

Pulsed Diode Lasers

8

Modulated CW Lasers

8

Mode-locked CW Lasers

9

Pulse Pickers and Cavity Dumpers

9

Detectors

9

Photomultiplier Tubes (PMTs)

9

Image intensifiers

11

Avalanche photodiodes

12

Cornerstones of Fluorescence Lifetime Imaging

12

Time Resolution

12

Signal-to-Noise Ratio

12

Detection efficiency

13

Recording efficiency

13

Sample Saturation

14

Photobleaching

14

Signal Processing Techniques

15

Gated Image Intensifiers

15

Modulation Techniques

17

Single Channel Modulation Techniques

18

Modulated Image Intensifiers

20

Gated Photon Counters

23

Time-Correlated Single Photon Counting (TCSPC)

26

TCSPC Imaging

27

Multi Wavelength TCSPC Imaging

29

Features of the TCSPC imaging techniques

32

Other TCSPC Techniques

35

Application of TCSPC to diffusion in cells

35

TCSPC Wide Field Imaging

35

Comparison of Signal Processing Techniques

36

Summary

37

References

38


spcmicr1.pdf
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