Dielectric-metal-dielectric nanotip for SNOM

Tomasz J. Antosiewicz; Piotr Wróbel; Tomasz Szoplik

doi:10.1117/12.827499

12 May 2009 Dielectric-metal-dielectric nanotip for SNOM

Tomasz J. Antosiewicz, Piotr Wróbel, Tomasz Szoplik

Proceedings Volume 7353, Metamaterials IV; 73530I (2009) https://doi.org/10.1117/12.827499
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

Superfocusing of light, far better than the diffraction limit, is of crucial importance for scanning near-field optical microscopy (SNOM), optical chemical sensing, and nanolithography. For SNOM applications there are two typical geometries. The first are tapered-fiber metal-coated aperture probes, which are being constantly improved. The other are tapered metal or metal-coated apertureless tips, which are continuously brought to perfection. We propose a modification of a metal-coated fiber tip, which has an additional, thin, dielectric coating with refractive index greater than that of air, what leads to higher field enhancement at the tip. The excitation signal is an internal, radially polarized Laguerre-Gauss beam. There is no sound theoretical model to describe nanofocusing of plasmons and we limit the scope of investigations to body-of-revolution finite-difference time-domain (BOR FDTD) simulations using in-house code. We find that with an increase of the refractive index of nanocladdings the maximum enhancement occurs for increasingly longer wavelengths.

Citation Download Citation

Tomasz J. Antosiewicz, Piotr Wróbel, and Tomasz Szoplik "Dielectric-metal-dielectric nanotip for SNOM", Proc. SPIE 7353, Metamaterials IV, 73530I (12 May 2009); https://doi.org/10.1117/12.827499

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