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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Ultra-high resolution resonant C-shaped aperture nano-tip
Yao-Te Cheng1, Yuzuru Takashima, Yin Yuen
1Department of Materials Science and Engineering, Stanford University, 420 Via Palou Mall, Stanford, California 94305, USA. ytcheng@stanford.edu
Optics Express
|March 30, 2011
Summary
We developed a novel C-aperture nano-tip (CAN-Tip) for enhanced optical near-field imaging. This new transducer achieves high resolution (~λ/60) and intensity, confirmed experimentally with scanning near-field optical microscopy (NSOM).
Area of Science:
- Optics and Photonics
- Nanotechnology
- Scanning Probe Microscopy
Background:
- Optical near-field imaging requires specialized transducers for high resolution.
- Existing methods often face limitations in intensity and background noise.
Purpose of the Study:
- To introduce and validate a new optical near-field transducer, the C-aperture nano-tip (CAN-Tip).
- To demonstrate the CAN-Tip's capability for high-resolution, high-intensity, and background-free near-field illumination.
Main Methods:
- Finite-difference time-domain (FDTD) simulations were used to predict performance.
- The CAN-Tip was experimentally fabricated and tested as a near-field scanning optical microscopy (NSOM) probe.
Main Results:
- Simulations predicted a 650x intensity enhancement and a resolution of approximately λ/60 at 980 nm.
- Independent tuning of aperture and antenna resonances allows for versatile wavelength applications.
- Experimental validation confirmed a near-field optical resolution of 16.1 nm.
Conclusions:
- The CAN-Tip is a promising transducer for advanced optical near-field applications.
- Its design allows for tunable resonances, enabling applications across various wavelengths, including UV.
- The demonstrated resolution and intensity pave the way for improved nanoscale optical imaging.
