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  4. Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres
 
conference paper

Photonic Nanojet engineering: Focal point shaping with scattering phenomena of dielectric microspheres

Kim, Myun-Sik  
•
Scharf, Toralf  
•
Mühlig, Stefan
Show more
Broquin, Jean Emmanuel
•
Conti, Gualtiero Nunzi
2011
Integrated Optoelectronic: Devices, Materials, and Technologies XV
Photonics West 2011

We experimentally engineer Nanojets produced by dielectric spheres by varying the illumination and observe the effect with a high-resolution interference microscope (HRIM). Converging and diverging spherical wavefronts and Bessel- Gauss beams are considered. We find that the diverging wavefront pushes Nanojets away from the surface of the sphere without change of the spot size. This allows earning several micrometers of working distance contrary to the Nanojet confined at the sphere’s surface. When the radius of curvature of the incident wavefront is greater than about 5 times the sphere size, the Nanojet moves back to the sphere surface like it is found for plane wave incidence. On-axis Bessel- Gauss beam illumination with the central lobe covering the whole sphere leads to the same results as the plane wave case. Off-axis Bessel beam illumination can generate multiple-spot Nanojets. We demonstrate the separation of such spots of about 220 nm at 642 nm. This separation is smaller than the feature sizes defined by the diffraction limit at this wavelength. We discuss briefly applications of engineered Nanojets for nano-lithography and near-field sensing.

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Type
conference paper
DOI
10.1117/12.887604
Web of Science ID

WOS:000298084600028

Author(s)
Kim, Myun-Sik  
•
Scharf, Toralf  
•
Mühlig, Stefan
•
Rockstuhl, Carsten
•
Herzig, Hans Peter  
Editors
Broquin, Jean Emmanuel
•
Conti, Gualtiero Nunzi
Date Issued

2011

Publisher

SPIE

Publisher place

San Francisco, CA, USA

Published in
Integrated Optoelectronic: Devices, Materials, and Technologies XV
Series title/Series vol.

Proceedings of SPIE

Volume

7941

Issue

49

Start page

794115

End page

1~194115

Subjects

Photonic Nanojet

•

beam shaping

•

wavefront measurement

•

interference microscope

•

nano-lithography

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
OPT  
Event nameEvent placeEvent date
Photonics West 2011

San Francisco, California, USA

January 21-26, 2011

Available on Infoscience
February 16, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/64370
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