Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging

Ozaki, N. et al. (2019) Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging. Journal of Physics D: Applied Physics, 52(22), 225105. (doi:10.1088/1361-6463/ab0ea5)

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Abstract

We developed a near-infrared (NIR) superluminescent diode (SLD) based on self-assembled InAs quantum dots (QDs) and demonstrated high-axial-resolution optical coherence tomography (OCT) imaging using this QD-based SLD (QD-SLD). The QD-SLD utilized InAs QDs with controlled emission wavelengths as a NIR broadband light emitter, and a tilted waveguide with segmented electrodes was prepared for edge-emitting broadband electroluminescence (EL) spanning approximately 1–1.3 μm. The bandwidth of the EL spectrum was increased up to 144 nm at a temperature of 25 °C controlled using a thermoelectric cooler. The inverse Fourier transform of the EL spectrum predicted a minimum resolution of 3.6 μm in air. The QD-SLD was subsequently introduced into a spectral-domain (SD)-OCT setup, and SD-OCT imaging was performed for industrial and biological test samples. The OCT images obtained using the QD-SLD showed an axial resolution of ~4 μm, which was almost the same as that predicted from the spectrum. This axial resolution is less than the typical size of a single biological cell (~5 μm), and the practical demonstration of high-axial-resolution OCT imaging shows the application of QD-SLDs as a compact OCT light source, which enables the development of a portable OCT system.

Item Type:Articles
Additional Information:This work was supported in part by Grants-in-Aid for Scientific Research (KAKENHI) Grant Nos. 25286052, 16H03858, and 16KK0130, by the Canon Foundation, and by the Terumo Foundation for Life Sciences and Arts.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Childs, Dr David and Hogg, Professor Richard
Authors: Ozaki, N., Yamauchi, S., Hayashi, Y., Watanabe, E., Ohsato, H., Ikeda, N., Sugimoto, Y., Furuki, K., Oikawa, Y., Miyaji, K., Childs, D. T.D., and Hogg, R. A.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Journal of Physics D: Applied Physics
Publisher:IOP Publishing
ISSN:0022-3727
ISSN (Online):1361-6463
Published Online:11 March 2019

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