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Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 5968–5973
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Robustness of Lorenz-Mie microscopy against defects in illumination

Henrique W. Moyses, Bhaskar J. Krishnatreya, and David G. Grier  »View Author Affiliations


Optics Express, Vol. 21, Issue 5, pp. 5968-5973 (2013)
http://dx.doi.org/10.1364/OE.21.005968


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Abstract

Lorenz-Mie analysis of colloidal spheres’ holograms has been reported to achieve remarkable resolution not only for the spheres’ three-dimensional positions, but also for their sizes and refractive indexes. Here we apply numerical modeling to establish limits on the instrumental resolution for tracking and characterizing individual colloidal spheres with Lorenz-Mie microscopy.

© 2013 OSA

1. Introduction

In-line holographic video microscopy (HVM) images [1

1. J. Sheng, E. Malkiel, and J. Katz, “Digital holographic microscope for measuring three-dimensional particle distributions and motions,” Appl. Opt. 45, 3893–3901 (2006) [CrossRef] [PubMed] .

, 2

2. S.-H. Lee and D. G. Grier, “Holographic microscopy of holographically trapped three-dimensional structures,” Opt. Express 15, 1505–1512 (2007) [CrossRef] [PubMed] .

] can be interpreted with predictions of the Lorenz-Mie theory of light scattering [3

3. C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley Interscience, 1983).

] to simultaneously track and characterize individual colloidal particles [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

]. Unlike complementary techniques that focus on measuring the phase of the scattered wavefront [5

5. T. Colomb, E. Cuche, F. Charrière, J. Kühn, N. Aspert, F. Montfort, P. Marquet, and C. Depeursinge, “Automatic procedure for aberration compensation in digital holographic microscopy and applications to speciment shape compensation,” Appl. Opt. 45, 851–863 (2006) [CrossRef] [PubMed] .

7

7. D. G. Abdelsalam, B. J. Baek, and D. Kim, “Influence of the collimation of the reference wave in off-axis digital holography,” Optik 123, 1469–1473 (2012) [CrossRef] .

] numerically reconstructing the scattered light field [1

1. J. Sheng, E. Malkiel, and J. Katz, “Digital holographic microscope for measuring three-dimensional particle distributions and motions,” Appl. Opt. 45, 3893–3901 (2006) [CrossRef] [PubMed] .

, 2

2. S.-H. Lee and D. G. Grier, “Holographic microscopy of holographically trapped three-dimensional structures,” Opt. Express 15, 1505–1512 (2007) [CrossRef] [PubMed] .

, 8

8. U. Schnars and W. P. O. Jüptner, “Digital recording and reconstruction of holograms,” Meas. Sci. Technol. 13, R85–R101 (2002) [CrossRef] .

, 9

9. J. H. Milgram and W. C. Li, “Computational reconstruction of images from holograms,” Appl. Opt. 41, 853–864 (2002) [CrossRef] [PubMed] .

], or interpreting the measured interference pattern with phenomenological models [10

10. B. J. Thompson, “Holographic particle sizing techniques,” J. Phys. E 7, 781–788 (1974) [CrossRef] .

12

12. S. L. Pu, D. Allano, B. Patte-Rouland, M. Malek, D. Lebrun, and K. F. Cen, “Particle field characterization by digital in-line holography: 3D location and sizing,” Exp. Fluids 39, 1–9 (2005) [CrossRef] .

], Lorenz-Mie microscopy yields both the three-dimensional positions of individual scatterers and also their sizes and complex refractive indexes. This wealth of time-resolved information has enabled such applications as holographic microrheology [13

13. F. C. Cheong, S. Duarte, S.-H. Lee, and D. G. Grier, “Holographic microrheology of polysaccharides from Streptococcus mutans biofilms,” Rheol. Acta 48, 109–115 (2009) [CrossRef] .

], nanometer-resolution particle-image velocimetry [14

14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

16

16. L. Dixon, F. C. Cheong, and D. G. Grier, “Holographic particle-streak velocimetry,” Opt. Express 19, 4393–4398 (2011) [CrossRef] [PubMed] .

] particle-resolved porosimetry [17

17. F. C. Cheong, K. Xiao, D. J. Pine, and D. G. Grier, “Holographic characterization of individual colloidal spheres’ porosities,” Soft Matter 7, 6816–6819 (2011) [CrossRef] .

], microrefractometry [18

18. H. Shpaisman, B. J. Krishnatreya, and D. G. Grier, “Holographic microrefractometer,” Appl. Phys. Lett. 101, 091102 (2012) [CrossRef] .

] and label-free molecular binding assays [14

14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

].

The benefits of Lorenz-Mie microscopy derive not only from the quantity of particle-resolved information it yields, but also from the high precision claimed for each of the extracted parameters [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

]. Tracking resolution has been verified independently by analyzing the measured trajectories of freely diffusing colloidal spheres [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

, 14

14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

, 15

15. F. C. Cheong, B. J. Krishnatreya, and D. G. Grier, “Strategies for three-dimensional particle tracking with holographic video microscopy,” Opt. Express 18, 13563–13573 (2010) [CrossRef] [PubMed] .

]. These measurements confirm that the resolution for locating a sphere’s center can exceed 1 nanometer in the plane and 10 nanometers axially over ranges extending to hundreds of micrometers. Numerical uncertainties in the fit values for colloidal spheres’ radii and refractive indexes similarly suggest part-per-thousand resolution in these quantities as well [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

,14

14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

,18

18. H. Shpaisman, B. J. Krishnatreya, and D. G. Grier, “Holographic microrefractometer,” Appl. Phys. Lett. 101, 091102 (2012) [CrossRef] .

]. These latter estimates have not been verified independently, however, because no other methods exist to measure the size and refractive index of individual colloidal spheres in situ and with such high resolution.

Here, we establish limits on the tracking and characterization resolution of Lorenz-Mie microscopy by numerically modeling the influence of non-ideal illumination conditions on measured outcomes. The standard analysis [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

] treats the incident illumination as a plane wave propagating along the optical axis. Departures from this model in a practical implementation might reasonably be expected to degrade performance. We therefore assess through simulations how uncompensated curvature and tilt of the illuminating beam’s wavefronts affect extracted values for particle position, size and refractive index obtained in real-world implementations.

An in-line hologram is created when light scattered by an object interferes with the remainder of the illuminating beam, as shown in Fig. 1. In our implementation, the interference pattern is magnified by a conventional microscope before being recorded with a video camera. Each snapshot in the resulting video stream records the intensity
I(r)=|E0(r)+Es(rrp)|2
(1)
at position r in the microscope’s focal plane due to the superposition of the time-averaged incident electric field, E0(r), and the field Es(rrp) scattered by an object centered at position rp. Assuming the object to be small compared with the typical length scale for variations in the illumination, the scattered field may be approximated as
Es(r)=E0(rp)f(k(rrp)),
(2)
where the scattering function f(kr) describes the outgoing wave that is created by illuminating the particle with the incident wave. The scattering function may be expressed in generalized Lorenz-Mie theory as a series expansion [19

19. J. A. Lock and G. Gouesbet, “Generalized Lorenz-Mie theory and applications,” J. Quant. Spectrosc. Radiat. Transf. 110, 800–807 (2009) [CrossRef] .

, 20

20. G. Gouesbet, “T-matrix fomulationand generalized Lorenz-Mie theories in spherical coordinates,” Opt. Commun. 283, 517–521 (2010) [CrossRef] .

]
f(kr)=n=1m=nn{rmn[Memn(3)(kr)iMomn(3)(kr)]ismn[Nemn(3)(kr)iNomn(3)(kr)]},
(3)
in the vector spherical harmonics, Memn(3)(kr), Momn(3)(kr), Nemn(3)(kr) and Nomn(3)(kr)[3

3. C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley Interscience, 1983).

]. The expansion coefficients rmn and smn depend on the structure of the illuminating beam and the properties of the scatterer. For the special case of scattering by a sphere, they reduce to [20

20. G. Gouesbet, “T-matrix fomulationand generalized Lorenz-Mie theories in spherical coordinates,” Opt. Commun. 283, 517–521 (2010) [CrossRef] .

]
rmn=in+3m|m|2n+1n(n+1)(nm)!(n|m|)!gn,TEmβn(kap,np/nm)and
(4)
smn=in+3m|m|2n+1n(n+1)(nm)!(n|m|)!gn,TMmαn(kap,np/nm),
(5)
where αn(kap, np/nm) and βn(kap, np/nm) are the familiar Lorenz-Mie coefficients [3

3. C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley Interscience, 1983).

] for scattering of a plane wave by a sphere. These, in turn, depend on the sphere’s radius ap, and its complex refractive index, np, relative to that of the medium nm. The transverse electric (TE) and transverse magnetic (TM) beam shape coefficients, gn,TEm and gn,TMm, account for the structure of the incident illumination. Equations (4) and (5) are the complex conjugate of the expressions in Ref. [20

20. G. Gouesbet, “T-matrix fomulationand generalized Lorenz-Mie theories in spherical coordinates,” Opt. Commun. 283, 517–521 (2010) [CrossRef] .

] because here we assume a time dependence exp(−iωt).

Fig. 1 Schematic representation of image formation by in-line holography. (a) Ideal configuration, with scatterer at height zp above the imaging plane. (b) Diverging illumination. (c) Inclined illumination. Grayscale images are computed holograms illustrating the influence of illumination defects.

In the present study, we assess discrepancies in the estimates for rp, ap and np that arise when the plane-wave approximation, Eq. (6), is used to interpret holograms that are formed with more realistic models for the incident illumination. Specifically, we identify errors arising from divergence and tilt in the illuminating beam. These simulations establish limits on systematic errors for these parameters that can be expected in practical implementations. Under typical experimental conditions, with divergence angles smaller than 1 mrad and tilt angles less than 10 mrad, the resulting errors are found to be an order of magnitude smaller than numerical uncertainties in the fit parameters [4

4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

, 14

14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

]. From this we conclude that other factors have a more substantial influence on measurement errors in Lorenz-Mie microscopy and that the analysis technique is robust against this class of illumination defects.

2. Influence of beam divergence

To study the effects of diverging illumination, we model the incident light as a Gaussian beam of vacuum wavelength λ and wave number k = 2πnm/λ propagating along +ẑ through a medium of refractive index nm. Rather than being collimated as in Fig. 1(a), the beam diverges from a focus of half-width w0 at a height z0 above the focal plane of the microscope, as shown in Fig. 1(b). Its electric field is then given in the paraxial approximation by
E0(r)=D(z)exp(D(z)x2+y2w02)exp(ik[z+z0])x^,where
(7)
D(z)=(1+2iz+z0kw02)1.
(8)
Equations (7) and (8) accurately describe a weakly divergent beam with kw0π. Assuming that the particle is centered on the optical axis at height zp above the focal plane, the beam shape coefficients are [19

19. J. A. Lock and G. Gouesbet, “Generalized Lorenz-Mie theory and applications,” J. Quant. Spectrosc. Radiat. Transf. 110, 800–807 (2009) [CrossRef] .

]
ign,TE1=ign,TE1=gn,TM±1=12exp(D(zp)[kw0]2[n+12]2).
(9)

We use Eqs. (7) through (9) as inputs to Eqs. (1) through (3) to compute simulated holograms of spherical particles with specified radii and refractive indexes at specified heights above the center of the focal plane. We then use Eq. (6) to extract estimates āp, n̄p and z̄p for each particle’s characteristics and position under the plane-wave approximation. The differences Δap = āpap, Δnp = n̄pnp, and Δzp = z̄pzp represent the errors incurred by fitting the data with a simplified model. Typical results for the relative errors are plotted in Fig. 2 as a function of the beam divergence angle
Ω=tan1(2kw0).
(10)

The parameters chosen for these simulations are intended to mimic the conditions in recently published experiments [21

21. Y. Roichman, B. Sun, A. Stolarski, and D. G. Grier, “Influence of non-conservative optical forces on the dynamics of optically trapped colloidal spheres: The fountain of probability,” Phys. Rev. Lett. 101, 128301 (2008) [CrossRef] [PubMed] .

, 22

22. B. Sun, J. Lin, E. Darby, A. Y. Grosberg, and D. G. Grier, “Brownian vortexes,” Phys. Rev. E 80, 010401(R) (2009) [CrossRef] .

] on micrometer-diameter colloidal silica spheres in water with ap = 0.75 μm, np = 1.5, and zp = 13.5 μm in a medium with nm = 1.33 at λ = 640 nm. Taking the position of the illuminating laser’s output coupler to be the center of curvature, these experiments have z0 = 10 cm and Ω = 1 mrad, using the manufacturer’s specification for beam divergence. The corresponding simulations yield relative discrepancies Δap/ap ≤ 10−5, Δnp/np ≤ 10−4 and Δzp/zp ≤ 10−4. This is at least one order of magnitude better than the 1 nm resolution reported for ap, the 10 nm resolution reported for zp and the part-per-thousand resolution claimed for np[21

21. Y. Roichman, B. Sun, A. Stolarski, and D. G. Grier, “Influence of non-conservative optical forces on the dynamics of optically trapped colloidal spheres: The fountain of probability,” Phys. Rev. Lett. 101, 128301 (2008) [CrossRef] [PubMed] .

, 22

22. B. Sun, J. Lin, E. Darby, A. Y. Grosberg, and D. G. Grier, “Brownian vortexes,” Phys. Rev. E 80, 010401(R) (2009) [CrossRef] .

].

Fig. 2 Relative errors in (a) radius ap, (b) refractive index np and (c) axial position zp as a function of the wavefront radius z0 for various values of the divergence angle Ω.

The data in Fig. 2 suggest that divergence-induced errors scale as 1/z0 when the source is positioned beyond the Rayleigh range zR=12kw02, and are maximized at z0 = zR. Even in this worst-case configuration, the estimated error is smaller than the claimed resolution for Ω ≤ 2 mrad, which is a reasonable value for a well-collimated beam.

3. Influence of beam inclination

Figure 3 shows the relative discrepancies for the radius, index of refraction and axial position for a particle with ap = 0.75 μm and np = 1.5 in a medium with nm = 1.33 as a function of the tilt angle of the laser for different values of the axial position zp. Whereas the errors due to divergence plotted in Fig. 2 vary smoothly with wavefront curvature, those due to tilt feature discrete jumps. This is because inclination distorts a hologram’s circular interference fringes into ellipses, thereby breaking the radial symmetry implicit in the fitting procedure. Jumps in Fig. 3 reflect changes in the best circularly symmetric fit with increasing distortion.

Fig. 3 Relative errors in (a) radius ap, (b) refractive index np and (c) axial position zp as a function of angle of inclination of the illumination.

Even after accounting for ellipticity in the inclined images, the relative discrepancy in all fit parameters is less than a part per thousand for tilt angles smaller than 1° (17 mrad) over the experimentally accessible range of the axial position. This falls within the previously estimated range of errors, and confirms that inclination of the illumination is not the dominant source of error in Lorenz-Mie microscopy. Local inclination due to divergent illumination similarly causes negligible offsets for particles located off the optical axis, at least for experimentally relevant values of the beam divergence.

The observed robustness of Lorenz-Mie microscopy against errors in optical alignment leaves open the question of the technique’s ultimate resolution. The principal underlying approximation, invoked in Eq. (6), involves normalizing the recorded hologram I(r) with an estimate I0(r) for the background illumination. Correlated artifacts introduced by departures from ideal normalization can influence fits to Eq. (6). Equation (6), moreover, does not account for phase disorder in the illumination, which may introduce additional correlated artifacts. Finally, issues such as the signal-to-noise ratio of the recording, the linewidth of the source and the coherence length of the illumination have yet to be considered. The present study thus adds support to the claimed resolution of Lorenz-Mie microscopy while hinting that substantial additional gains may yet be achieved.

Acknowledgments

This work was supported by the National Science Foundation through Grant Number DMR-0922680.

References and links

1.

J. Sheng, E. Malkiel, and J. Katz, “Digital holographic microscope for measuring three-dimensional particle distributions and motions,” Appl. Opt. 45, 3893–3901 (2006) [CrossRef] [PubMed] .

2.

S.-H. Lee and D. G. Grier, “Holographic microscopy of holographically trapped three-dimensional structures,” Opt. Express 15, 1505–1512 (2007) [CrossRef] [PubMed] .

3.

C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley Interscience, 1983).

4.

S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express 15, 18275–18282 (2007) [CrossRef] [PubMed] .

5.

T. Colomb, E. Cuche, F. Charrière, J. Kühn, N. Aspert, F. Montfort, P. Marquet, and C. Depeursinge, “Automatic procedure for aberration compensation in digital holographic microscopy and applications to speciment shape compensation,” Appl. Opt. 45, 851–863 (2006) [CrossRef] [PubMed] .

6.

J. Garcia-Sucerquia, W. Xu, S. K. Jericho, P. Klages, M. H. Jericho, and H. J. Kreuzer, “Digital in-line holographic microscopy,” Appl. Opt. 45, 836–850 (2006) [CrossRef] [PubMed] .

7.

D. G. Abdelsalam, B. J. Baek, and D. Kim, “Influence of the collimation of the reference wave in off-axis digital holography,” Optik 123, 1469–1473 (2012) [CrossRef] .

8.

U. Schnars and W. P. O. Jüptner, “Digital recording and reconstruction of holograms,” Meas. Sci. Technol. 13, R85–R101 (2002) [CrossRef] .

9.

J. H. Milgram and W. C. Li, “Computational reconstruction of images from holograms,” Appl. Opt. 41, 853–864 (2002) [CrossRef] [PubMed] .

10.

B. J. Thompson, “Holographic particle sizing techniques,” J. Phys. E 7, 781–788 (1974) [CrossRef] .

11.

S. Soontaranon, J. Widjaja, and T. Asakura, “Improved holographic particle sizing by using absolute values of the wavelet transform,” Opt. Commun. 240, 253–260 (2004) [CrossRef] .

12.

S. L. Pu, D. Allano, B. Patte-Rouland, M. Malek, D. Lebrun, and K. F. Cen, “Particle field characterization by digital in-line holography: 3D location and sizing,” Exp. Fluids 39, 1–9 (2005) [CrossRef] .

13.

F. C. Cheong, S. Duarte, S.-H. Lee, and D. G. Grier, “Holographic microrheology of polysaccharides from Streptococcus mutans biofilms,” Rheol. Acta 48, 109–115 (2009) [CrossRef] .

14.

F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express 17, 13071–13079 (2009) [CrossRef] [PubMed] .

15.

F. C. Cheong, B. J. Krishnatreya, and D. G. Grier, “Strategies for three-dimensional particle tracking with holographic video microscopy,” Opt. Express 18, 13563–13573 (2010) [CrossRef] [PubMed] .

16.

L. Dixon, F. C. Cheong, and D. G. Grier, “Holographic particle-streak velocimetry,” Opt. Express 19, 4393–4398 (2011) [CrossRef] [PubMed] .

17.

F. C. Cheong, K. Xiao, D. J. Pine, and D. G. Grier, “Holographic characterization of individual colloidal spheres’ porosities,” Soft Matter 7, 6816–6819 (2011) [CrossRef] .

18.

H. Shpaisman, B. J. Krishnatreya, and D. G. Grier, “Holographic microrefractometer,” Appl. Phys. Lett. 101, 091102 (2012) [CrossRef] .

19.

J. A. Lock and G. Gouesbet, “Generalized Lorenz-Mie theory and applications,” J. Quant. Spectrosc. Radiat. Transf. 110, 800–807 (2009) [CrossRef] .

20.

G. Gouesbet, “T-matrix fomulationand generalized Lorenz-Mie theories in spherical coordinates,” Opt. Commun. 283, 517–521 (2010) [CrossRef] .

21.

Y. Roichman, B. Sun, A. Stolarski, and D. G. Grier, “Influence of non-conservative optical forces on the dynamics of optically trapped colloidal spheres: The fountain of probability,” Phys. Rev. Lett. 101, 128301 (2008) [CrossRef] [PubMed] .

22.

B. Sun, J. Lin, E. Darby, A. Y. Grosberg, and D. G. Grier, “Brownian vortexes,” Phys. Rev. E 80, 010401(R) (2009) [CrossRef] .

OCIS Codes
(090.1760) Holography : Computer holography
(180.6900) Microscopy : Three-dimensional microscopy
(290.5850) Scattering : Scattering, particles

ToC Category:
Microscopy

History
Original Manuscript: November 21, 2012
Manuscript Accepted: February 22, 2013
Published: March 4, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Henrique W. Moyses, Bhaskar J. Krishnatreya, and David G. Grier, "Robustness of Lorenz-Mie microscopy against defects in illumination," Opt. Express 21, 5968-5973 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-5-5968


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References

  1. J. Sheng, E. Malkiel, and J. Katz, “Digital holographic microscope for measuring three-dimensional particle distributions and motions,” Appl. Opt.45, 3893–3901 (2006). [CrossRef] [PubMed]
  2. S.-H. Lee and D. G. Grier, “Holographic microscopy of holographically trapped three-dimensional structures,” Opt. Express15, 1505–1512 (2007). [CrossRef] [PubMed]
  3. C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles (Wiley Interscience, 1983).
  4. S.-H. Lee, Y. Roichman, G.-R. Yi, S.-H. Kim, S.-M. Yang, A. van Blaaderen, P. van Oostrum, and D. G. Grier, “Characterizing and tracking single colloidal particles with video holographic microscopy,” Opt. Express15, 18275–18282 (2007). [CrossRef] [PubMed]
  5. T. Colomb, E. Cuche, F. Charrière, J. Kühn, N. Aspert, F. Montfort, P. Marquet, and C. Depeursinge, “Automatic procedure for aberration compensation in digital holographic microscopy and applications to speciment shape compensation,” Appl. Opt.45, 851–863 (2006). [CrossRef] [PubMed]
  6. J. Garcia-Sucerquia, W. Xu, S. K. Jericho, P. Klages, M. H. Jericho, and H. J. Kreuzer, “Digital in-line holographic microscopy,” Appl. Opt.45, 836–850 (2006). [CrossRef] [PubMed]
  7. D. G. Abdelsalam, B. J. Baek, and D. Kim, “Influence of the collimation of the reference wave in off-axis digital holography,” Optik123, 1469–1473 (2012). [CrossRef]
  8. U. Schnars and W. P. O. Jüptner, “Digital recording and reconstruction of holograms,” Meas. Sci. Technol.13, R85–R101 (2002). [CrossRef]
  9. J. H. Milgram and W. C. Li, “Computational reconstruction of images from holograms,” Appl. Opt.41, 853–864 (2002). [CrossRef] [PubMed]
  10. B. J. Thompson, “Holographic particle sizing techniques,” J. Phys. E7, 781–788 (1974). [CrossRef]
  11. S. Soontaranon, J. Widjaja, and T. Asakura, “Improved holographic particle sizing by using absolute values of the wavelet transform,” Opt. Commun.240, 253–260 (2004). [CrossRef]
  12. S. L. Pu, D. Allano, B. Patte-Rouland, M. Malek, D. Lebrun, and K. F. Cen, “Particle field characterization by digital in-line holography: 3D location and sizing,” Exp. Fluids39, 1–9 (2005). [CrossRef]
  13. F. C. Cheong, S. Duarte, S.-H. Lee, and D. G. Grier, “Holographic microrheology of polysaccharides from Streptococcus mutans biofilms,” Rheol. Acta48, 109–115 (2009). [CrossRef]
  14. F. C. Cheong, B. Sun, R. Dreyfus, J. Amato-Grill, K. Xiao, L. Dixon, and D. G. Grier, “Flow visualization and flow cytometry with holographic video microscopy,” Opt. Express17, 13071–13079 (2009). [CrossRef] [PubMed]
  15. F. C. Cheong, B. J. Krishnatreya, and D. G. Grier, “Strategies for three-dimensional particle tracking with holographic video microscopy,” Opt. Express18, 13563–13573 (2010). [CrossRef] [PubMed]
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