|
Resolution of objects within subwavelength range by using the near field of a dipole |
Optics Letters, Vol. 37, Issue 12, pp. 2313-2315 (2012)
http://dx.doi.org/10.1364/OL.37.002313
Enhanced HTML 
Acrobat PDF (287 KB)
Abstract
We analyze the far-field resolution of apertures that are illuminated by a point dipole located at subwavelength distances. It is well known that radiation emitted by a localized source can be considered a combination of traveling and evanescent waves, when represented by the angular spectrum method. The evanescent wave part of the source can be converted to propagating waves by diffraction at the aperture; thereby it contributes to the far-field detection. Therefore one can expect an increase in the resolution of objects. We present explicit calculations showing that the resolution at the far zone is improved by decreasing the source-aperture distance. We also utilize the resolution enhancement by the near field of a dipole to resolve two closely located apertures. The results show that without the near field (evanescent field) the apertures are not resolved, whereas with the near field of the dipole the far zone intensity distribution shows improved resolution. This method eliminates the requirements of near-field techniques such as controlling and scanning closely located tip detectors.
© 2012 Optical Society of America
OCIS Codes
(050.1940) Diffraction and gratings : Diffraction
(330.6130) Vision, color, and visual optics : Spatial resolution
(180.4243) Microscopy : Near-field microscopy
ToC Category:
Vision, Color, and Visual Optics
History
Original Manuscript: March 15, 2012
Revised Manuscript: May 4, 2012
Manuscript Accepted: May 13, 2012
Published: June 8, 2012
Virtual Issues
Vol. 7, Iss. 8 Virtual Journal for Biomedical Optics
Citation
Aziz Kolkıran and G. S. Agarwal, "Resolution of objects within subwavelength range by using the near field of a dipole," Opt. Lett. 37, 2313-2315 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ol-37-12-2313
You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Log in to access OSA Member Subscription
Related Journal Articles 
- Analytic expression for Fresnel diffraction: comment (JOSAA)
- Bessel-like beams modulated by arbitrary radial functions (JOSAA)
- Marginal phase correction of truncated Bessel beams (JOSAA)
- On the zero-thickness model of diffractive optical elements (JOSAA)
- Characterization of nanoscale features in tapered fractal and photonic crystal fibers (OE)
Related Conference Papers
- Diffraction-Suppressed High-Resolution Imaging Through Metallodielectric Medium
- Diffraction-Suppressed High-Resolution Imaging Through Metallodielectric Medium
- Hyperbolic Localization in Photonic Crystals without Defects
- Observation of a 1D and 2D Dark Notch Formed in a Quadratic Photorefractive Medium
- Supercontinuum Interference from Fresnel Diffraction Caused by Periodic Filamentation
« Previous Article | Next Article »
OSA is a member of 