Abstract

The trade-off between spot size and depth of focus (DOF) often limits the performance of optical systems, such as optical coherence tomography and optical tweezers. Although researchers have proposed various methods to extend the DOF in free-space optics, many are difficult to implement in miniaturized optical probes due to space limitations. In this study, we present an optical probe with an extended DOF using a binary phase spatial filter (BPSF). The BPSF pattern was fabricated on the distal tip of an optical probe with a diameter of 1 mm by replica molding soft lithography, which can be easily implemented in a miniaturized optical probe due to its simple configuration. We optimized the BPSF pattern to enhance DOF, spot diameter, and light efficiency. To evaluate the fabricated endoscopic optical probe, we measured the three-dimensional point spread function of the BPSF probe and compared it with a probe without BPSF. The BPSF probe has a spot diameter of 3.56 μm and a DOF of 199.7 μm, while the probe without BPSF has a spot diameter of 3.69 μm and a DOF of 73.9 μm, representing a DOF gain of 2.7. We anticipate that this optical probe can be used in biomedical applications, including optical imaging and optical trapping techniques.

© 2016 Optical Society of America

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References

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2014 (3)

2013 (2)

J. Mo, M. de Groot, and J. F. de Boer, “Focus-extension by depth-encoded synthetic aperture in Optical Coherence Tomography,” Opt. Express 21(8), 10048–10061 (2013).
[Crossref] [PubMed]

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

2012 (2)

2011 (2)

C. Blatter, B. Grajciar, C. M. Eigenwillig, W. Wieser, B. R. Biedermann, R. Huber, and R. A. Leitgeb, “Extended focus high-speed swept source OCT with self-reconstructive illumination,” Opt. Express 19(13), 12141–12155 (2011).
[Crossref] [PubMed]

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

2010 (1)

D. Qin, Y. Xia, and G. M. Whitesides, “Soft lithography for micro- and nanoscale patterning,” Nat. Protoc. 5(3), 491–502 (2010).
[Crossref] [PubMed]

2008 (2)

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

K. S. Lee and J. P. Rolland, “Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range,” Opt. Lett. 33(15), 1696–1698 (2008).
[Crossref] [PubMed]

2007 (4)

2006 (1)

2005 (1)

2003 (1)

2002 (1)

2001 (1)

1997 (1)

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Adie, S. G.

Ahmad, A.

Biedermann, B. R.

Blatter, C.

Boppart, S. A.

Y. Z. Liu, N. D. Shemonski, S. G. Adie, A. Ahmad, A. J. Bower, P. S. Carney, and S. A. Boppart, “Computed optical interferometric tomography for high-speed volumetric cellular imaging,” Biomed. Opt. Express 5(9), 2988–3000 (2014).
[Crossref] [PubMed]

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Bouma, B. E.

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Bower, A. J.

Brezinski, M. E.

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Carney, P. S.

Y. Z. Liu, N. D. Shemonski, S. G. Adie, A. Ahmad, A. J. Bower, P. S. Carney, and S. A. Boppart, “Computed optical interferometric tomography for high-speed volumetric cellular imaging,” Biomed. Opt. Express 5(9), 2988–3000 (2014).
[Crossref] [PubMed]

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

Chan, R. C.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Chen, N.

Chen, Z.

Choma, M.

Christian Singe, C.

Curatolo, A.

Davis, B. J.

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

de Boer, J. F.

J. Mo, M. de Groot, and J. F. de Boer, “Focus-extension by depth-encoded synthetic aperture in Optical Coherence Tomography,” Opt. Express 21(8), 10048–10061 (2013).
[Crossref] [PubMed]

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

de Groot, M.

Desjardins, A. E.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Ding, Z.

Eigenwillig, C. M.

Evans, J. A.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Fujimoto, J. G.

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Gan, F.

Gardecki, J. A.

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

Grajciar, B.

Grulkowski, I.

Guo, S.

Ha, W.

Howe, W. C.

Huber, R.

Itoh, M.

Izatt, J.

Jang, I. K.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Jeong, Y.

Kang, D.

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

Kim, J.

Lee, K. S.

Lee, S.

Leitgeb, R. A.

Liu, C.

Liu, D.

Liu, L.

Liu, Y. Z.

Lorenser, D.

Makita, S.

Marks, D. L.

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

Martinez, R. V.

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

Mo, J.

Nadkarni, S. K.

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

Nakamura, Y.

Nelson, J. S.

Nishioka, N. S.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Oh, K.

Oh, W. Y.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Pitris, C.

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Qin, D.

D. Qin, Y. Xia, and G. M. Whitesides, “Soft lithography for micro- and nanoscale patterning,” Nat. Protoc. 5(3), 491–502 (2010).
[Crossref] [PubMed]

Ralston, T. S.

B. J. Davis, D. L. Marks, T. S. Ralston, P. S. Carney, and S. A. Boppart, “Interferometric synthetic aperture microscopy: computed imaging for scanned coherent microscopy,” Sensors (Basel) 8(6), 3903–3931 (2008).
[Crossref] [PubMed]

Rao, B.

Ren, H.

Rolland, J. P.

Sampson, D. D.

Sando, Y.

Sarunic, M.

Shemonski, N. D.

Sheppard, C. J.

Shin, J. S.

Shishkov, M.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Singh, J.

Southern, J. F.

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Su, J.

Sugisaka, J.

Sun, J.

Suter, M. J.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Szulzycki, K.

Tearney, G. J.

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

G. J. Tearney, M. E. Brezinski, B. E. Bouma, S. A. Boppart, C. Pitris, J. F. Southern, and J. G. Fujimoto, “In vivo endoscopic optical biopsy with optical coherence tomography,” Science 276(5321), 2037–2039 (1997).
[Crossref] [PubMed]

Toussaint, J. D.

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

Vakoc, B. J.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Wang, H.

Wang, Q.

Whitesides, G. M.

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

D. Qin, Y. Xia, and G. M. Whitesides, “Soft lithography for micro- and nanoscale patterning,” Nat. Protoc. 5(3), 491–502 (2010).
[Crossref] [PubMed]

Wieser, W.

Wojtkowski, M.

Xia, Y.

D. Qin, Y. Xia, and G. M. Whitesides, “Soft lithography for micro- and nanoscale patterning,” Nat. Protoc. 5(3), 491–502 (2010).
[Crossref] [PubMed]

Xu, Y.

Yagi, Y.

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

Yang, C.

Yang, X.

Yasuno, Y.

Yatagai, T.

Yu, L.

Yun, M.

Yun, S. H.

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Zhang, J.

Zhao, Y.

Appl. Opt. (1)

Biomed. Opt. Express (1)

J. Opt. Soc. Am. A (1)

Lab Chip (1)

D. Kang, R. V. Martinez, G. M. Whitesides, and G. J. Tearney, “Miniature grating for spectrally-encoded endoscopy,” Lab Chip 13(9), 1810–1816 (2013).
[Crossref] [PubMed]

Nat. Med. (2)

L. Liu, J. A. Gardecki, S. K. Nadkarni, J. D. Toussaint, Y. Yagi, B. E. Bouma, and G. J. Tearney, “Imaging the subcellular structure of human coronary atherosclerosis using micro-optical coherence tomography,” Nat. Med. 17(8), 1010–1014 (2011).
[Crossref] [PubMed]

S. H. Yun, G. J. Tearney, B. J. Vakoc, M. Shishkov, W. Y. Oh, A. E. Desjardins, M. J. Suter, R. C. Chan, J. A. Evans, I. K. Jang, N. S. Nishioka, J. F. de Boer, and B. E. Bouma, “Comprehensive volumetric optical microscopy in vivo,” Nat. Med. 12(12), 1429–1433 (2007).
[Crossref] [PubMed]

Nat. Protoc. (1)

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Y. Xu, J. Singh, C. J. Sheppard, and N. Chen, “Ultra long high resolution beam by multi-zone rotationally symmetrical complex pupil filter,” Opt. Express 15(10), 6409–6413 (2007).
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M. Choma, M. Sarunic, C. Yang, and J. Izatt, “Sensitivity advantage of swept source and Fourier domain optical coherence tomography,” Opt. Express 11(18), 2183–2189 (2003).
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I. Grulkowski, K. Szulzycki, and M. Wojtkowski, “Microscopic OCT imaging with focus extension by ultrahigh-speed acousto-optic tunable lens and stroboscopic illumination,” Opt. Express 22(26), 31746–31760 (2014).
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J. Mo, M. de Groot, and J. F. de Boer, “Focus-extension by depth-encoded synthetic aperture in Optical Coherence Tomography,” Opt. Express 21(8), 10048–10061 (2013).
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Figures (7)

Fig. 1
Fig. 1 (a) Schematic of the probe without (top) and with (bottom) BPSF. (b) Structure of the BPSF and its cross-section. The height d was set to 0.8 μm to achieve the phase delay of π (gray zones).
Fig. 2
Fig. 2 The maps of the (a) DOF, (b) FWHM diameter, (c) LE, and (d) merit function f, with the change of rb and rc when ra = 40 μm. The red and green boxes in (d) indicate the candidates of optimal design.
Fig. 3
Fig. 3 (a, b) Simulated XZ PSF (left) and X intensity profiles at different defocus distances (right panels) of (a) the probe without BPSF and (b) the BPSF probe. (c) Simulated FWHM diameter as a function of defocus without (blue) and with (red) BPSF. The dashed line indicates the range of DOF. (d) Simulated normalized on-axis intensity distribution without (blue) and with (red) BPSF.
Fig. 4
Fig. 4 Schematic diagram of fabrication processes.
Fig. 5
Fig. 5 Results of the fabricated BPSF probe. A photograph of (a) the probe and (b) the BPSF pattern on the distal tip of the probe. (c) The 3D surface profile of the BPSF and (d) its height profile measured by a confocal three-dimensional microscope.
Fig. 6
Fig. 6 Experimental setup for measuring the 3-D PSF of the probe.
Fig. 7
Fig. 7 Measured 3-D PSF of (a) the probe without BPSF and (b) the BPSF probe. Intensity profiles are shown in the right panels through the defocus distances. (c) Measured FWHM diameter without (blue) and with (red) BPSF. The dashed line indicates the range of DOF. (d) Measured normalized on-axis intensity distribution without (blue) and with (red) BPSF.

Equations (5)

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D= 4λ πNA ,
DOF= 8λ πN A 2 ,
φ=π 2(n1)d λ ,
d= λ 2(n1) .
f= w 1 DOF + w 2 ×FWHM+ w 3 LE ,

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