High efficiency metasurfaces based on topology optimization (Conference Presentation)

Jonathan A. Fan

doi:10.1117/12.2321232

17 September 2018 High efficiency metasurfaces based on topology optimization (Conference Presentation)

Jonathan A. Fan

Proceedings Volume 10719, Metamaterials, Metadevices, and Metasystems 2018; 107190V (2018) https://doi.org/10.1117/12.2321232
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

Metasurfaces are thin-film optical devices that use nanoscale geometric designs to shape the wavefront of electromagnetic waves. In this talk, we discuss how adjoint-based inverse design can be used to produce high efficiency metasurfaces that can efficiently respond to a broad range of incident wave inputs. We discuss two classes of devices. First, we demonstrate periodic dielectric metasurfaces that can support ultra-high efficiency (>90%) anomalous refraction for nearly arbitrary combinations of incident and outgoing angles. Both polarization dependent and independent device configurations can be realized, and the achieved metrics exceed the capabilities of conventional metasurfaces and diffraction gratings based on Littrow mounting by a large margin. Second, we discuss a route towards aperiodic devices. Our general design strategy is to sub-divide the desired phase profile into wavelength-scale sections and use topology optimization to design each of these sections individually. Compared to design schemes that focus on optimizing the entire device at once, our method has clear advantages in scalability and computational efficiency. We show that with our design approach, we can theoretically and experimentally produce high efficiency, high numerical aperture lenses. All of the devices presented here utilize dielectric nanostructures that support strong near-field optical interactions with neighboring structures and non-trivial optical mode dynamics, thereby extending their functionality beyond that of discrete phase shifters.

Conference Presentation

Citation Download Citation

Jonathan A. Fan "High efficiency metasurfaces based on topology optimization (Conference Presentation)", Proc. SPIE 10719, Metamaterials, Metadevices, and Metasystems 2018, 107190V (17 September 2018); https://doi.org/10.1117/12.2321232

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Dielectrics

Near field optics

Dielectric polarization

Diffraction gratings

Electromagnetic radiation

Optical components

Refraction

Show All Keywords

Keywords/Phrases

Search In:

Publication Years