{"title":"Femtosecond laser direct writing of complementary THz metasurfaces using a structured vortex beam","authors":"","doi":"10.1016/j.optlastec.2024.111831","DOIUrl":null,"url":null,"abstract":"<div><div>Metasurfaces, which are increasingly popular for creating ultra-thin optical components, offer a way to reduce the bulkiness of traditional optics, especially in the THz band. Typically, metasurfaces are fabricated using lithographic techniques in clean rooms, but a simpler fabrication method could expand their applicability. In this study, we present a femtosecond laser-based direct fabrication of complementary metasurfaces, highlighting the benefits of a single-step, mask-free process using structured light beams. A q-plate is used to generate an annular vortex beam with femtosecond duration, which is further tailored to imprint individual meta-atoms by perforating an Au film deposited on a Si substrate through laser ablation. This technique enables the creation of various metasurfaces designed for THz operation, as verified by full-wave simulations, featuring distinct shapes and periodicities for efficient electromagnetic radiation delivery. The fabricated devices are experimentally tested using time-domain spectroscopy, confirming the expected transmission properties and demonstrating the reliability and versatility of the proposed approach.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":null,"pages":null},"PeriodicalIF":4.6000,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics and Laser Technology","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0030399224012891","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Metasurfaces, which are increasingly popular for creating ultra-thin optical components, offer a way to reduce the bulkiness of traditional optics, especially in the THz band. Typically, metasurfaces are fabricated using lithographic techniques in clean rooms, but a simpler fabrication method could expand their applicability. In this study, we present a femtosecond laser-based direct fabrication of complementary metasurfaces, highlighting the benefits of a single-step, mask-free process using structured light beams. A q-plate is used to generate an annular vortex beam with femtosecond duration, which is further tailored to imprint individual meta-atoms by perforating an Au film deposited on a Si substrate through laser ablation. This technique enables the creation of various metasurfaces designed for THz operation, as verified by full-wave simulations, featuring distinct shapes and periodicities for efficient electromagnetic radiation delivery. The fabricated devices are experimentally tested using time-domain spectroscopy, confirming the expected transmission properties and demonstrating the reliability and versatility of the proposed approach.
期刊介绍:
Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication.
The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas:
•development in all types of lasers
•developments in optoelectronic devices and photonics
•developments in new photonics and optical concepts
•developments in conventional optics, optical instruments and components
•techniques of optical metrology, including interferometry and optical fibre sensors
•LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow
•applications of lasers to materials processing, optical NDT display (including holography) and optical communication
•research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume)
•developments in optical computing and optical information processing
•developments in new optical materials
•developments in new optical characterization methods and techniques
•developments in quantum optics
•developments in light assisted micro and nanofabrication methods and techniques
•developments in nanophotonics and biophotonics
•developments in imaging processing and systems