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https://hdl.handle.net/20.500.11851/7117
Title: | Nanostructured Multilayer Coatings for Spatial Filtering | Authors: | Grineviciute, Lina Babayiğit, Ceren Gailevicius, Darius Peckus, Martynas Turduev, Mirbek Tolenis, Tomas Staliunas, Kestutis |
Keywords: | metamaterials microlasers photonic crystals physical vapor deposition spatial filtering |
Publisher: | Wiley-V C H Verlag Gmbh | Abstract: | Spatial filtering is an important mechanism to improve the spatial quality of laser beams. Typically, a confocal arrangement of lenses with a diaphragm in the focal plane is used for intracavity spatial filtering. Such conventional filtering requires access to the far-field domain. In microlasers, however, conventional filtering is impossible due to the lack of space in microresonators to access the far-field. Therefore, a novel concept for more compact and efficient spatial filtering is necessary. In this study, a conceptually novel mechanism of spatial filtering in the near-field domain is proposed and demonstrated, by a nanostructured multilayer coating-a 2D photonic crystal structure with a periodic index modulation along the longitudinal and transverse directions to the beam propagation. The structure is built on a nanomodulated substrate, to provide the transverse periodicity. The physical vapor deposition is used to provide self-repeating modulation in the longitudinal direction. A 5 mu m thick photonic multilayer structure composed of nanostructured multiple layers of alternating high- and low-index materials providing spatial filtering in the near-infrared frequencies with 2 degrees low angle passband is experimentally demonstrated. The proposed photonic structure can be considered as an ideal component for intracavity spatial filtering in microlasers. | URI: | https://doi.org/10.1002/adom.202001730 https://hdl.handle.net/20.500.11851/7117 |
ISSN: | 2195-1071 |
Appears in Collections: | Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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