Delay Properties of Optical Wave in Sermiconductor Trench for Depth Measurement Using Interference Spectroscopy

概要

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In the depth measurement of trenches on a semiconductor substrate by means of interference spectroscopy, we sometimes cannot measure the depth when the diameter approaches the wavelength of visible light. To investigate the cause, we determined the delay properties from the reflected intensity data obtained by interference spectroscopy. Then, we confirmed that the delay time in the short wavelength is nearly equal to the time taken by the light to reach the bottom and return to the entrance. However, we found that when the trench diameter approaches the wavelength used in measurement, the change of delay becomes long.
社団法人応用物理学会の論文
1993-08-15