Deep subwavelength optical nanoantenna with enhanced characteristics for near and far field applications

Mohamed A. Nasr; Mohamed A. Swillam

doi:10.1117/12.2002076

21 February 2013 Deep subwavelength optical nanoantenna with enhanced characteristics for near and far field applications

Mohamed A. Nasr, Mohamed A. Swillam

Author Affiliations +

Proceedings Volume 8632, Photonic and Phononic Properties of Engineered Nanostructures III; 86321F (2013) https://doi.org/10.1117/12.2002076
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

Extraordinary optical transmission through a subwavelength aperture was discovered more than a decade ago. A single subwavelength aperture surrounded by a finite array of grooves on a thin metallic film is a design used by many authors to show subwavelength focusing. In this paper, a modified version of this design is introduced that, to the best of our knowledge, gives best results of this design in terms of the peak power and the full width at half maximum FWHM in the near field as well as the far field of the lens. Numerical simulations using Finite-Difference Time-Domain (FDTD) method coupled with perfectly matched layer (PML) boundary conditions verify that the proposed metallic lens can give a near (far) field focal point 125 nm (1.39 μm) away from lens with FWHM of 245 (299) nm at incident wavelength of 760 (610) nm with power enhancement of at least 2 times over the unmodified design. The dependence of this resonant focusing ability with a certain geometrical parameter defining the modified structure is extensively analyzed in the visible range of spectrum. Such a focusing plasmonic device has potential practical applications like NSOM and FSOM due to the simplicity in its design and fabrication and due to superior results in near and far fields of the lens.

Citation Download Citation

Mohamed A. Nasr and Mohamed A. Swillam "Deep subwavelength optical nanoantenna with enhanced characteristics for near and far field applications", Proc. SPIE 8632, Photonic and Phononic Properties of Engineered Nanostructures III, 86321F (21 February 2013); https://doi.org/10.1117/12.2002076

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
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Plasmonics

Finite-difference time-domain method

Near field scanning optical microscopy

Nanoantennas

Near field

Gold

Near field optics

Show All Keywords

Keywords/Phrases

Search In:

Publication Years