Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip

B.I. Akça, B. Považay, A. Alex, K. Wörhoff, R.M. de Ridder, W. Drexler, M. Pollnau

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Abstract

Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, we assemble the central components of a spectral-domain OCT system on a silicon chip. The spectrometer comprises an arrayed-waveguide grating with 136-nm free spectral range and 0.21-nm wavelength resolution. The beam splitter is realized by a non-uniform adiabatic coupler with its 3-dB splitting ratio being nearly constant over 150 nm. With this device whose overall volume is 0.36 cm3 we demonstrate high-quality in vivo imaging in human skin with 1.4-mm penetration depth, 7.5-μm axial resolution, and a signal-to-noise ratio of 74 dB. Considering the reasonable performance of this early OCT on-a-chip system and the anticipated improvements in this technology, a completely different range of devices and new fields of applications may become feasible.
Original languageEnglish
Pages (from-to)16648-16656
Number of pages9
JournalOptics express
Volume21
Issue number14
DOIs
Publication statusPublished - Jul 2013

Fingerprint

beam splitters
tomography
chips
spectrometers
silicon
systems-on-a-chip
integrated optics
couplers
signal to noise ratios
penetration
alignment
gratings
waveguides
costs
wavelengths

Keywords

  • IOMS-PIT: PHOTONICS INTEGRATION TECHNOLOGY
  • Optical Coherence Tomography (OCT)
  • Integrated optics devices

Cite this

Akça, B. I., Považay, B., Alex, A., Wörhoff, K., de Ridder, R. M., Drexler, W., & Pollnau, M. (2013). Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip. Optics express, 21(14), 16648-16656. https://doi.org/10.1364/OE.21.016648
Akça, B.I. ; Považay, B. ; Alex, A. ; Wörhoff, K. ; de Ridder, R.M. ; Drexler, W. ; Pollnau, M. / Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip. In: Optics express. 2013 ; Vol. 21, No. 14. pp. 16648-16656.
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Akça, BI, Považay, B, Alex, A, Wörhoff, K, de Ridder, RM, Drexler, W & Pollnau, M 2013, 'Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip' Optics express, vol. 21, no. 14, pp. 16648-16656. https://doi.org/10.1364/OE.21.016648

Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip. / Akça, B.I.; Považay, B.; Alex, A.; Wörhoff, K.; de Ridder, R.M.; Drexler, W.; Pollnau, M.

In: Optics express, Vol. 21, No. 14, 07.2013, p. 16648-16656.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip

AU - Akça, B.I.

AU - Považay, B.

AU - Alex, A.

AU - Wörhoff, K.

AU - de Ridder, R.M.

AU - Drexler, W.

AU - Pollnau, M.

PY - 2013/7

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AB - Optical coherence tomography (OCT) has enabled clinical applications that revolutionized in vivo medical diagnostics. Nevertheless, its current limitations owing to cost, size, complexity, and the need for accurate alignment must be overcome by radically novel approaches. Exploiting integrated optics, we assemble the central components of a spectral-domain OCT system on a silicon chip. The spectrometer comprises an arrayed-waveguide grating with 136-nm free spectral range and 0.21-nm wavelength resolution. The beam splitter is realized by a non-uniform adiabatic coupler with its 3-dB splitting ratio being nearly constant over 150 nm. With this device whose overall volume is 0.36 cm3 we demonstrate high-quality in vivo imaging in human skin with 1.4-mm penetration depth, 7.5-μm axial resolution, and a signal-to-noise ratio of 74 dB. Considering the reasonable performance of this early OCT on-a-chip system and the anticipated improvements in this technology, a completely different range of devices and new fields of applications may become feasible.

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Akça BI, Považay B, Alex A, Wörhoff K, de Ridder RM, Drexler W et al. Miniature spectrometer and beam splitter for an optical coherence tomography on a silicon chip. Optics express. 2013 Jul;21(14):16648-16656. https://doi.org/10.1364/OE.21.016648