Related Experiment Video
Updated: Jun 11, 2026
09:29
Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
Published on: September 27, 2011
Plasmonic nanofocusing using a metal-coated axicon prism.
Keisuke Kato1, Atsushi Ono, Wataru Inami
1Department of Mechanical Engineering, Shizuoka University, Naka, Hamamatsu, Japan.
Optics Express
|July 1, 2010
Summary
We developed a new method to focus light to a tiny spot at the tip of a special prism. This surface plasmon excitation creates a highly localized and enhanced light spot for advanced applications.
Area of Science:
- Optics and Photonics
- Plasmonics
- Nanotechnology
Background:
- Surface plasmons enable light manipulation at the nanoscale.
- Axicon prisms can shape light into non-diffracting beams.
- Controlling light localization is crucial for advanced optical applications.
Purpose of the Study:
- To propose and investigate a novel excitation method for photon localization at the apex of a metal-coated axicon prism.
- To achieve enhanced light concentration using surface plasmon interference.
- To explore the potential of nanofocusing for optical applications.
Main Methods:
- Designing a metal-coated axicon prism with specific cone angle and film thickness for surface plasmon excitation.
- Utilizing finite-difference time-domain (FDTD) simulations to model light propagation and intensity distributions.
- Investigating the effect of incident radial polarization on the generated optical field.
Main Results:
- Surface plasmons were successfully excited and propagated along the axicon prism sides.
- The surface plasmons converged at the prism apex, resulting in nanofocusing.
- Incident radial polarization led to constructive interference of surface plasmons, generating a localized and field-enhanced spot.
- Simulations confirmed the predicted intensity distributions and field enhancement.
Conclusions:
- The proposed method effectively achieves photon localization and nanofocusing at the apex of a metal-coated axicon prism.
- The design parameters (cone angle, film thickness) are critical for matching surface plasmon excitation conditions.
- Constructive interference of surface plasmons, particularly with radial polarization, is key to generating highly localized and enhanced optical fields.
