Femtosecond-laser-assisted fabrication of double-layer diffraction gratings inside fused silica glass
- Type
- Article
- Citation
- Journal of the Korean Physical Society, v.66, no.1, pp.55 - 60
- Issued Date
- 2015-01
- Abstract
- We have fabricated double-layer diffraction gratings with a zigzag shape inside fused silica glass by using a femtosecond laser, the intention of which is to overcome the hindrance of shortening grating's period. Our primary focus is to utilize double-layer gratings to achieve a diffraction pattern similar to that from a single-layer diffraction grating with the same period as the double-layer grating. We fabricated two kinds of double-layer gratings, where the grating's period was either 6 mu m or 2 mu m for both layers. The first set of diffraction gratings was printed 70 mu m inside the glass substrates. This layer was followed by the second layer grating engraved just below the first layer grating (The shifted grating's position was shifted to the right by 3 mu m for the 6-mu m-period grating and by 1 mu m for the 2-mu m-period grating). By varying the layer gap, we have found the optimal position (layer gap: 500 nm) to achieve a diffraction pattern similar to that of a single-layer diffraction grating with half the grating's period of the double-layer gratings.
- Publisher
- 한국물리학회
- ISSN
- 0374-4884
- Appears in Collections:
- Department of Electrical Engineering and Computer Science > 1. Journal Articles
Research Institutes > 1. Journal Articles
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