8 December 2016 Electric-field intensity enhancement of a series of artificial nodules in a broadband high-reflection coating
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Optical Engineering, 56(1), 011027 (2016). doi:10.1117/1.OE.56.1.011027
A broadband high-reflection (HR) coating was used to suppress the electric-field intensity (EFI) enhancement in artificial nodules with five different sizes. However, the finitie-difference time-domain simulations reflected that the nodules initiating from 1.0-μmSiO2 seeds showed abnormally stronger EFI enhancement, which is almost two times higher than the EFI enhancement of 1.0-μmSiO2 seeds in a quarter-wave HR coating. This was also confirmed by the laser-induced damage threshold measurement. Our previous model combining light focusing and light penetrating effects was carefully examined to check whether the hotspots in a nodule initiating from the 1.0-μmSiO2 seed were in the focal area or not. Although it was found that the focal length of the nodule decreased with reducing seed diameter, the hotspots in nodules initiating from a 1.0-μmSiO2 seed were still much shallower than the focal area. In the broadband HR coating, the standing-wave EFI profiles at different working angles were given, which showed that the standing-wave EFI at the hotspots region was not negligible. Some complex interference or diffraction may cause the light to arrive at the hotspots region in phase and result in strong EFI enhancement. More work is necessary to gain a deeper understanding of this phenomenon.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Hongping Ma, Xinbin Cheng, Jinlong Zhang, Bin Ma, Hongfei Jiao, Zhanshan Wang, Tongbao Li, Jin Yu, Zhijun Kang, Yongjian Tang, "Electric-field intensity enhancement of a series of artificial nodules in a broadband high-reflection coating," Optical Engineering 56(1), 011027 (8 December 2016). https://doi.org/10.1117/1.OE.56.1.011027


Hybrid fiber optics

High reflection coatings

Laser induced damage

Refractive index

Optical engineering


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