Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging
Development of a broadband superluminescent diode based on self-assembled InAs quantum dots and demonstration of high-axial-resolution optical coherence tomography imaging
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DOI：
10.1088/1361-6463/ab0ea5
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发表时间：
2019-03
期刊：
影响因子：
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通讯作者：
N. Ozaki;S. Yamauchi;Yuma Hayashi;E. Watanabe;H. Ohsato;N. Ikeda;Y. Sugimoto;K. Furuki;Y. Oikawa;K. Miyaji;D. Childs;R. Hogg
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作者：
N. Ozaki;S. Yamauchi;Yuma Hayashi;E. Watanabe;H. Ohsato;N. Ikeda;Y. Sugimoto;K. Furuki;Y. Oikawa;K. Miyaji;D. Childs;R. Hogg
我们开发了一种基于自组装InAs量子点（QDs）的近红外（NIR）超发光二极管（SLD），并利用这种基于量子点的近红外超发光二极管（QD-SLD）进行了高轴向分辨率光学相干断层扫描（OCT）成像。该QD-SLD利用可控制发射波长的InAs量子点作为近红外宽带发光源，制备了一种具有分段电极的倾斜波导，可实现宽度约为1 ~ 1.3 μm的边缘发射宽带电致发光（EL）。在热电冷却器控制的25°C温度下，EL光谱的带宽增加到144 nm。光谱的傅里叶反变换预测了空气中的最小分辨率为3.6 μm。随后将QD-SLD引入到光谱域(SD)-OCT设置中，并对工业和生物测试样品进行SD-OCT成像。利用QD-SLD获得的OCT图像显示轴向分辨率为~4 μm，与光谱预测结果基本一致。该轴向分辨率小于单个生物细胞的典型尺寸（~5 μm），高轴向分辨率OCT成像的实际演示表明，QD-SLDs作为紧凑型OCT光源的应用，使便携式OCT系统的开发成为可能。
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.