Laser confocal feedback tomography and nano-step height measurement
A promising method for tomography and step height measurement is proposed, which combines the high sensitivity of the frequency-shifted feedback laser and the axial positioning ability of confocal microscopy. By demodulating the feedback-induced intensity modulation signals, the obtained amplitude a...
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| Veröffentlicht in: | Scientific reports 2013-10, Vol.3 (1), p.2971-2971, Article 2971 |
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| creator | Tan, Yidong Wang, Weiping Xu, Chunxin Zhang, Shulian |
| description | A promising method for tomography and step height measurement is proposed, which combines the high sensitivity of the frequency-shifted feedback laser and the axial positioning ability of confocal microscopy. By demodulating the feedback-induced intensity modulation signals, the obtained amplitude and phase information are used to respectively determine the coarse and fine measurement of the samples. Imaging the micro devices and biological samples by the demodulated amplitude, this approach is proved to be able to achieve the cross-sectional image in highly scattered mediums. And then the successful height measurement of nano-step on a glass-substrate grating by combination of both amplitude and phase information indicates its axial high resolution (better than 2 nm) in a non-ambiguous range of about ten microns. |
| doi_str_mv | 10.1038/srep02971 |
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| subjects | 132/124 639/624/1075/1083 639/624/1075/401 639/624/1107 639/624/1107/510 Biological samples Confocal microscopy Feedback Humanities and Social Sciences multidisciplinary Science Tomography |
| title | Laser confocal feedback tomography and nano-step height measurement |
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