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Thin Films

The OSA Thin Films Technical Group is concerned with the theoretical and experimental aspects of the design, preparation, and characterization of optical thin film materials and interference coatings.


 

Metasurfaces: New Generation Building Blocks for Emerging Optics

When: 8 April 2021, 12:00 - 13:00 - Eastern Daylight Time (UTC - 04:00)

Light-matter interactions can be highly controlled via nanostructured thin films on the surface of objects. Indeed, a single-layer of designed and engineered subwavelength nanostructures, so-called metasurfaces, can resonantly couple to the incident light and manipulate the light’s behavior, in demand. Metasurfaces can reproduce the functions of bulk optics, and on occasions, can offer new functionalities that are not possible with conventional diffractive optics.

In this webinar hosted by the Thin Films Technical Group, Mohsen Rahmani, a UK Research and Innovation Future Leaders Fellow, from Nottingham Trent University will review his journey in employing metallic to dielectric and semiconductor metasurfaces to control the light intensity, frequency and propagation direction. In addition, Rahmani will discuss how metasurfaces can lead to several exciting applications, including night vision, flat optics and ultra-sensitive biochemical sensing. 

 

Surface Coatings that Inhibit Infection by SARS-CoV-2

When: 4 May 2021, 8:30 - 9:30 - Eastern Daylight Time (UTC - 04:00)

SARS-CoV-2, the virus that causes the disease COVID-19, remains viable on solids for periods of up to a week, so one potential route for human infection is via exposure to an infectious dose from a solid. During this webinar hosted by the Thin Films Technical Group, Prof. William Ducker will discuss the concept of using a coating on common touch surfaces, such as door handles and railings to continuously reduce the probability of infection by SARS-CoV-2.

The critical characteristics are: (1) rapid loss of viral transmission, (2) ability to continuously reduce transmission over time and environmental exposure without human intervention, (3) ability to coat many different surfaces, and (4) low toxicity to humans. Examples of successful coatings will be discussed, including a coating based on cuprous oxide (Cu2O) particles bound with polyurethane. The half-life of transmission of SARS-CoV-2 on this surface is 3-4 minutes. After one hour on coated glass or stainless steel, the viral titer was reduced by about 99.9% on average compared to the uncoated sample.  An advantage of a polyurethane-based coating is that polyurethane is already used to coat a large number of everyday objects. The coating adheres well to glass, steel, various plastics, wood, and cardboard. It retains its activity after one month and after cycles of disinfection and exposure to the virus.

On-Demand Thin Films Webinars

You can watch any of the following webinar presentations, which were hosted by the OSA Thin Films Technical Group, on-demand.


NameAffiliationTitle
Jue Wang Corning Advanced OpticsChair
Anna Sytchkova ENEA Optical Coatings LabVice Chair
Yi-Jun Jen National Taipei University of TechnologyChair-Elect
Xinbin Cheng Tongji UniversityEvents Officer
Selim Elhadj Lawrence Livermore National LaboratorySocial Media Officer
Amirkianoosh Kiani Ontario Tech. UniversityWebinar Officer
Julien H Lumeau Institut Fresnel - UMR 7249 – CNRSWebinar Officer
Adriana Viorica Szeghalmi Friedrich-Schiller-Universität JenaWebinar Officer



If you are a member of the Thin Films Technical Group and have ideas for activities and initiatives to help engage this community, please share them with the chair, Jue Wang.

                                 


View OSA Technical Group webinars on-demand at any time or register for any of our upcoming webinars online. Each webinar is an hour long and features a technical presentation on a topic selected by your OSA Technical Groups.


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