Abstract

We report sub-diffraction resolution in two-photon excitation (TPE) fluorescence microscopy achieved by merging this technique with stimulated-emission depletion (STED). We demonstrate an easy-to-implement and promising laser combination based on a short-pulse laser source for two-photon excitation and a continuous-wave (CW) laser source for resolution enhancement. Images of fluorescent nanoparticles and the immunostained transcription regulator NFκB in mammalian cell nuclei exhibit resolutions of <50 nm and ~70 nm in the focal plane, respectively, corresponding to a 4–5.4-fold improvement over the diffraction barrier.

© 2009 OSA

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  1. W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
    [CrossRef] [PubMed]
  2. S. W. Hell and J. Wichmann, “Breaking the diffraction resolution limit by stimulated emission: stimulated emission depletion microscopy,” Opt. Lett. 19(11), 780–782 (1994).
    [CrossRef] [PubMed]
  3. F. Helmchen and W. Denk, “Deep tissue two-photon microscopy,” Nat. Methods 2(12), 932–940 (2005).
    [CrossRef] [PubMed]
  4. A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
    [CrossRef]
  5. K. Svoboda and R. Yasuda, “Principles of two-photon excitation microscopy and its applications to neuroscience,” Neuron 50(6), 823–839 (2006).
    [CrossRef] [PubMed]
  6. S. W. Hell, “Microscopy and its focal switch,” Nat. Methods 6(1), 24–32 (2009).
    [CrossRef] [PubMed]
  7. T. A. Klar and S. W. Hell, “Subdiffraction resolution in far-field fluorescence microscopy,” Opt. Lett. 24(14), 954–956 (1999).
    [CrossRef]
  8. V. Westphal and S. W. Hell, “Nanoscale resolution in the focal plane of an optical microscope,” Phys. Rev. Lett. 94(14), 143903 (2005).
    [CrossRef] [PubMed]
  9. G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
    [CrossRef] [PubMed]
  10. B. Harke, J. Keller, C. K. Ullal, V. Westphal, A. Schönle, and S. W. Hell, “Resolution scaling in STED microscopy,” Opt. Express 16(6), 4154–4162 (2008).
    [CrossRef] [PubMed]
  11. E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
    [CrossRef]
  12. K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
    [CrossRef] [PubMed]
  13. R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
    [CrossRef]
  14. U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
    [CrossRef] [PubMed]
  15. V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
    [CrossRef] [PubMed]
  16. List of fluorescent dyes used in STED microscopy: http://www.mpibpc.mpg.de/abteilungen/200/STED_Dyes.htm
  17. D. Wildanger, E. Rittweger, L. Kastrup, and S. W. Hell, “STED microscopy with a supercontinuum laser source,” Opt. Express 16(13), 9614–9621 (2008).
    [CrossRef] [PubMed]
  18. B. R. Rankin, R. R. Kellner, and S. W. Hell, “Stimulated-emission-depletion microscopy with a multicolor stimulated-Raman-scattering light source,” Opt. Lett. 33(21), 2491–2493 (2008).
    [CrossRef] [PubMed]
  19. K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
    [CrossRef] [PubMed]
  20. S. W. Hell, M. Booth, S. Wilms, C. M. Schnetter, A. K. Kirsch, D. J. Arndt-Jovin, and T. M. Jovin, “Two-photon near- and far-field fluorescence microscopy with continuous-wave excitation,” Opt. Lett. 23(15), 1238–1240 (1998).
    [CrossRef]
  21. M. J. Booth and S. W. Hell, “Continuous wave excitation two-photon fluorescence microscopy exemplified with the 647-nm ArKr laser line,” J. Microsc. 190(3), 298–304 (1998).
    [CrossRef] [PubMed]
  22. T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
    [CrossRef]

2009

S. W. Hell, “Microscopy and its focal switch,” Nat. Methods 6(1), 24–32 (2009).
[CrossRef] [PubMed]

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

2008

2007

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

2006

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

K. Svoboda and R. Yasuda, “Principles of two-photon excitation microscopy and its applications to neuroscience,” Neuron 50(6), 823–839 (2006).
[CrossRef] [PubMed]

2005

V. Westphal and S. W. Hell, “Nanoscale resolution in the focal plane of an optical microscope,” Phys. Rev. Lett. 94(14), 143903 (2005).
[CrossRef] [PubMed]

F. Helmchen and W. Denk, “Deep tissue two-photon microscopy,” Nat. Methods 2(12), 932–940 (2005).
[CrossRef] [PubMed]

A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
[CrossRef]

1999

1998

S. W. Hell, M. Booth, S. Wilms, C. M. Schnetter, A. K. Kirsch, D. J. Arndt-Jovin, and T. M. Jovin, “Two-photon near- and far-field fluorescence microscopy with continuous-wave excitation,” Opt. Lett. 23(15), 1238–1240 (1998).
[CrossRef]

M. J. Booth and S. W. Hell, “Continuous wave excitation two-photon fluorescence microscopy exemplified with the 647-nm ArKr laser line,” J. Microsc. 190(3), 298–304 (1998).
[CrossRef] [PubMed]

1994

1990

W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
[CrossRef] [PubMed]

Andrei, M. A.

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Arndt-Jovin, D. J.

Baier, C. J.

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

Barrantes, F. J.

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

Bonhoeffer, T.

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

Booth, M.

Booth, M. J.

M. J. Booth and S. W. Hell, “Continuous wave excitation two-photon fluorescence microscopy exemplified with the 647-nm ArKr laser line,” J. Microsc. 190(3), 298–304 (1998).
[CrossRef] [PubMed]

Chirico, G.

A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
[CrossRef]

Collini, M.

A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
[CrossRef]

Denk, W.

F. Helmchen and W. Denk, “Deep tissue two-photon microscopy,” Nat. Methods 2(12), 932–940 (2005).
[CrossRef] [PubMed]

W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
[CrossRef] [PubMed]

Diaspro, A.

A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
[CrossRef]

Donnert, G.

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Eggeling, C.

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Engelhardt, J.

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

Han, K. Y.

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

Harke, B.

B. Harke, J. Keller, C. K. Ullal, V. Westphal, A. Schönle, and S. W. Hell, “Resolution scaling in STED microscopy,” Opt. Express 16(6), 4154–4162 (2008).
[CrossRef] [PubMed]

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

Hein, B.

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

Hell, S. W.

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

S. W. Hell, “Microscopy and its focal switch,” Nat. Methods 6(1), 24–32 (2009).
[CrossRef] [PubMed]

B. Harke, J. Keller, C. K. Ullal, V. Westphal, A. Schönle, and S. W. Hell, “Resolution scaling in STED microscopy,” Opt. Express 16(6), 4154–4162 (2008).
[CrossRef] [PubMed]

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

B. R. Rankin, R. R. Kellner, and S. W. Hell, “Stimulated-emission-depletion microscopy with a multicolor stimulated-Raman-scattering light source,” Opt. Lett. 33(21), 2491–2493 (2008).
[CrossRef] [PubMed]

D. Wildanger, E. Rittweger, L. Kastrup, and S. W. Hell, “STED microscopy with a supercontinuum laser source,” Opt. Express 16(13), 9614–9621 (2008).
[CrossRef] [PubMed]

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

V. Westphal and S. W. Hell, “Nanoscale resolution in the focal plane of an optical microscope,” Phys. Rev. Lett. 94(14), 143903 (2005).
[CrossRef] [PubMed]

T. A. Klar and S. W. Hell, “Subdiffraction resolution in far-field fluorescence microscopy,” Opt. Lett. 24(14), 954–956 (1999).
[CrossRef]

S. W. Hell, M. Booth, S. Wilms, C. M. Schnetter, A. K. Kirsch, D. J. Arndt-Jovin, and T. M. Jovin, “Two-photon near- and far-field fluorescence microscopy with continuous-wave excitation,” Opt. Lett. 23(15), 1238–1240 (1998).
[CrossRef]

M. J. Booth and S. W. Hell, “Continuous wave excitation two-photon fluorescence microscopy exemplified with the 647-nm ArKr laser line,” J. Microsc. 190(3), 298–304 (1998).
[CrossRef] [PubMed]

S. W. Hell and J. Wichmann, “Breaking the diffraction resolution limit by stimulated emission: stimulated emission depletion microscopy,” Opt. Lett. 19(11), 780–782 (1994).
[CrossRef] [PubMed]

Helmchen, F.

F. Helmchen and W. Denk, “Deep tissue two-photon microscopy,” Nat. Methods 2(12), 932–940 (2005).
[CrossRef] [PubMed]

Irvine, S. E.

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

Jahn, R.

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Jovin, T. M.

Kamin, D.

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

Kastrup, L.

Keller, J.

B. Harke, J. Keller, C. K. Ullal, V. Westphal, A. Schönle, and S. W. Hell, “Resolution scaling in STED microscopy,” Opt. Express 16(6), 4154–4162 (2008).
[CrossRef] [PubMed]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Kellner, R. R.

B. R. Rankin, R. R. Kellner, and S. W. Hell, “Stimulated-emission-depletion microscopy with a multicolor stimulated-Raman-scattering light source,” Opt. Lett. 33(21), 2491–2493 (2008).
[CrossRef] [PubMed]

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

Kirsch, A. K.

Klar, T. A.

Lang, M. C.

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

Lauterbach, M. A.

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

Lührmann, R.

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Medda, R.

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Nägerl, U. V.

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

Rankin, B. R.

Rittweger, E.

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

D. Wildanger, E. Rittweger, L. Kastrup, and S. W. Hell, “STED microscopy with a supercontinuum laser source,” Opt. Express 16(13), 9614–9621 (2008).
[CrossRef] [PubMed]

Rizzoli, S. O.

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

Schnetter, C. M.

Schönle, A.

Staudt, T.

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

Strickler, J. H.

W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
[CrossRef] [PubMed]

Svoboda, K.

K. Svoboda and R. Yasuda, “Principles of two-photon excitation microscopy and its applications to neuroscience,” Neuron 50(6), 823–839 (2006).
[CrossRef] [PubMed]

Ullal, C. K.

Webb, W. W.

W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
[CrossRef] [PubMed]

Westphal, V.

B. Harke, J. Keller, C. K. Ullal, V. Westphal, A. Schönle, and S. W. Hell, “Resolution scaling in STED microscopy,” Opt. Express 16(6), 4154–4162 (2008).
[CrossRef] [PubMed]

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

V. Westphal and S. W. Hell, “Nanoscale resolution in the focal plane of an optical microscope,” Phys. Rev. Lett. 94(14), 143903 (2005).
[CrossRef] [PubMed]

Wichmann, J.

Wildanger, D.

Willig, K. I.

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

Wilms, S.

Yasuda, R.

K. Svoboda and R. Yasuda, “Principles of two-photon excitation microscopy and its applications to neuroscience,” Neuron 50(6), 823–839 (2006).
[CrossRef] [PubMed]

J. Microsc.

M. J. Booth and S. W. Hell, “Continuous wave excitation two-photon fluorescence microscopy exemplified with the 647-nm ArKr laser line,” J. Microsc. 190(3), 298–304 (1998).
[CrossRef] [PubMed]

Microsc. Res. Tech.

T. Staudt, M. C. Lang, R. Medda, J. Engelhardt, and S. W. Hell, “2,2′-thiodiethanol: a new water soluble mounting medium for high resolution optical microscopy,” Microsc. Res. Tech. 70(1), 1–9 (2007).
[CrossRef]

Nat. Methods

K. I. Willig, B. Harke, R. Medda, and S. W. Hell, “STED microscopy with continuous wave beams,” Nat. Methods 4(11), 915–918 (2007).
[CrossRef] [PubMed]

F. Helmchen and W. Denk, “Deep tissue two-photon microscopy,” Nat. Methods 2(12), 932–940 (2005).
[CrossRef] [PubMed]

S. W. Hell, “Microscopy and its focal switch,” Nat. Methods 6(1), 24–32 (2009).
[CrossRef] [PubMed]

Nat. Photonics

E. Rittweger, K. Y. Han, S. E. Irvine, C. Eggeling, and S. W. Hell, “STED microscopy reveals crystal colour centres with nanometric resolution,” Nat. Photonics 3(3), 144–147 (2009).
[CrossRef]

Nature

K. I. Willig, S. O. Rizzoli, V. Westphal, R. Jahn, and S. W. Hell, “STED microscopy reveals that synaptotagmin remains clustered after synaptic vesicle exocytosis,” Nature 440(7086), 935–939 (2006).
[CrossRef] [PubMed]

Neuron

K. Svoboda and R. Yasuda, “Principles of two-photon excitation microscopy and its applications to neuroscience,” Neuron 50(6), 823–839 (2006).
[CrossRef] [PubMed]

Neuroscience

R. R. Kellner, C. J. Baier, K. I. Willig, S. W. Hell, and F. J. Barrantes, “Nanoscale organization of nicotinic acetylcholine receptors revealed by stimulated emission depletion microscopy,” Neuroscience 144(1), 135–143 (2007).
[CrossRef]

Opt. Express

Opt. Lett.

Phys. Rev. Lett.

V. Westphal and S. W. Hell, “Nanoscale resolution in the focal plane of an optical microscope,” Phys. Rev. Lett. 94(14), 143903 (2005).
[CrossRef] [PubMed]

Proc. Natl. Acad. Sci. U.S.A.

G. Donnert, J. Keller, R. Medda, M. A. Andrei, S. O. Rizzoli, R. Lührmann, R. Jahn, C. Eggeling, and S. W. Hell, “Macromolecular-scale resolution in biological fluorescence microscopy,” Proc. Natl. Acad. Sci. U.S.A. 103(31), 11440–11445 (2006).
[CrossRef] [PubMed]

U. V. Nägerl, K. I. Willig, B. Hein, S. W. Hell, and T. Bonhoeffer, “Live-cell imaging of dendritic spines by STED microscopy,” Proc. Natl. Acad. Sci. U.S.A. 105(48), 18982–18987 (2008).
[CrossRef] [PubMed]

Q. Rev. Biophys.

A. Diaspro, G. Chirico, and M. Collini, “Two-photon fluorescence excitation and related techniques in biological microscopy,” Q. Rev. Biophys. 38(02), 97–166 (2005).
[CrossRef]

Science

W. Denk, J. H. Strickler, and W. W. Webb, “Two-photon laser scanning fluorescence microscopy,” Science 248(4951), 73–76 (1990).
[CrossRef] [PubMed]

V. Westphal, S. O. Rizzoli, M. A. Lauterbach, D. Kamin, R. Jahn, and S. W. Hell, “Video-rate far-field optical nanoscopy dissects synaptic vesicle movement,” Science 320(5873), 246–249 (2008).
[CrossRef] [PubMed]

Other

List of fluorescent dyes used in STED microscopy: http://www.mpibpc.mpg.de/abteilungen/200/STED_Dyes.htm

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Figures (3)

Fig. 1
Fig. 1

Principles of the reported implementation of TPE-STED microscopy. (a) Energy diagram of the 3 processes involved. (b) Light intensity distribution of the two-photon excitation spot (left) and of the STED doughnut (right) in the focal plan. Scale bars represent 500 nm (c) Setup.

Fig. 2
Fig. 2

Comparison of TPE and TPE-STED images of 20 nm NileRed fluorescent beads mounted on a cover glass. (a) and (b) are, respectively, the raw pictures of TPE and TPE-STED. (c) and (d) shows linearly de-convolved enlargements of the areas marked with white squares in (a) and (b). All scale bars correspond to 500 nm. Normalized line profiles taken between the arrows in (a) and (b) are plotted in (e) in red and green, respectively.

Fig. 3
Fig. 3

Images (xy) of the 3D distribution of NFκB immunostained with ATTO 565 in the nucleus of a PtK2 cell. TPE (a,e,i) and TPE-STED (b,f,j) raw images were taken at different depths (z) along the optic axis with axial distances of 400 nm: (a,b), (e,f) and (i,j). Scale bars on these images represent 5 µm. (c) and (d) show linearly de-convolved enlargements of the areas marked with white squares respectively in (a) and (b). (g,h) correspond to (e,f), and (k,l) to (i,j). Scale bars for the zoomed in images represent 500 nm.

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