Prof. Dan Shi Profile

Prof. Dan Shi

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 5 March 2021 Presentation + Paper

Wide-angle beam focusing with a tuning GeSbTe phase-change metalens

Dan Shi, Ozdal Boyraz, Keyi Cui, Md Shafiqul Islam, Parinaz Sadri-Moshkenani

Proceedings Volume 11695, 116950P (2021) https://doi.org/10.1117/12.2578700

KEYWORDS: Crystals, Switches, Spherical lenses, Silicon, Phase shifts, Laser crystals, Infrared radiation, Diffraction

Read Abstract +

A tuning metalens in transmission mode with GeSbTe (GST) phase-change material is proposed in this paper. Traditional single-layer metalenses with fixed geometry structure face the difficulty of focusing the wide-angle incident wave on the same focal point. Combining GST phase-change material with metasurface structure, the proposed single-layer metalens can converge wide-angel beam from −30° to 30° on a focal point with high efficiency without geometric structure variation. The unit cell of the proposed metalens consists of a GST nanopost and a silicon ring. GST phase-change material excited by a series of pulses switches among amorphous, crystalline and partially crystallized states. The phase shift controlled by each unit cell can well match the phase distribution of metalens required by focusing for different incident beams by changing the crystallization level of the GST. The simulation results show that the proposed metalens operating at 1550 nm wavelength can convert the incident plane wave to a converging spherical wave and focus it on a focal point with more than 27.68% efficiency when the incident angle changes from −30° to 30°. The focal length is in the range of 4535.4 to 4967.1 nm, in good agreement with the designed focal length of 4650 nm. Moreover, the full width at half maximum (FWHM) is from 0.581λ to 0.625λ approaching the diffraction limit of 0.6538λ. The proposed metalens is applicable for near-infrared light focusing with large view field.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years