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Title

Near-field imaging of femtosecond laser ablated sub-lambda/4 holes in lithium niobate

Author(s)

Rodenas, Airan;  Lamela, Jorge;  Jaque, Daniel;  Lifante, Gines;  Jaque, Francisco;  Garcia-Martin, Antonio;  Zhou, Guangyong;  Gu, Min

Abstract

We report on the direct femtosecond laser ablation of sub-lambda/4 (80–250 nm) holes in LiNbO3 crystals and on its local near-field imaging. We show that the near-field transmission of holes can feature an attenuation of ~75% at hole central position, and a ~20% transmission enhancement at its sides. This high-contrast ring-shaped near-field distribution is found to be in agreement with simulations, suggesting the surface relief as the main contrast mechanism.

Publication type

Journal article

Source

Applied Physics Letters, Vol. 95, no. 18 (2009)

Publication year

2009

Keyword(s)

Femtosecond lasers;  Lithium niobate;  Near-field imaging

Publisher

American Institute of Physics

ISSN

0003-6951

Publisher URL

http://dx.doi.org/10.1063/1.3256219

Copyright

Copyright © 2009 American Institute of Physics. Published version of this paper reproduced here in accordance with the copyright policy of the publisher.

Full text

Peer reviewed