Book contents
- Frontmatter
- Contents
- Preface to the first edition
- Preface to the second edition
- 1 Introduction
- 2 Theoretical foundations
- 3 Propagation and focusing of optical fields
- 4 Resolution and localization
- 5 Nanoscale optical microscopy
- 6 Localization of light with near-field probes
- 7 Probe–sample distance control
- 8 Optical interactions
- 9 Quantum emitters
- 10 Dipole emission near planar interfaces
- 11 Photonic crystals, resonators, and cavity optomechanics
- 12 Surface plasmons
- 13 Optical antennas
- 14 Optical forces
- 15 Fluctuation-induced interactions
- 16 Theoretical methods in nano-optics
- Appendix A Semi-analytical derivation of the atomic polarizability
- Appendix B Spontaneous emission in the weak-coupling regime
- Appendix C Fields of a dipole near a layered substrate
- Appendix D Far-field Green functions
- Index
- References
6 - Localization of light with near-field probes
Published online by Cambridge University Press: 05 November 2012
- Frontmatter
- Contents
- Preface to the first edition
- Preface to the second edition
- 1 Introduction
- 2 Theoretical foundations
- 3 Propagation and focusing of optical fields
- 4 Resolution and localization
- 5 Nanoscale optical microscopy
- 6 Localization of light with near-field probes
- 7 Probe–sample distance control
- 8 Optical interactions
- 9 Quantum emitters
- 10 Dipole emission near planar interfaces
- 11 Photonic crystals, resonators, and cavity optomechanics
- 12 Surface plasmons
- 13 Optical antennas
- 14 Optical forces
- 15 Fluctuation-induced interactions
- 16 Theoretical methods in nano-optics
- Appendix A Semi-analytical derivation of the atomic polarizability
- Appendix B Spontaneous emission in the weak-coupling regime
- Appendix C Fields of a dipole near a layered substrate
- Appendix D Far-field Green functions
- Index
- References
Summary
Near-field optical probes, such as laser-irradiated apertures or metal tips, are the key components of the near-field microscopes discussed in the previous chapter. No matter in which configuration a probe is used, the achievable resolution depends on how well the probe is able to confine the optical energy. This chapter discusses light propagation and light confinement in different probes. Fundamental properties are discussed and an overview of fabrication methods is provided. The most common optical probes are (1) uncoated tapered glass fibers, (2) aperture probes, and (3) pointed metal/semiconductor structures and resonant-particle probes. The reciprocity theorem of electromagnetism states that a signal remains unchanged upon exchange of source and detector (see Chapter 2.13). We therefore consider all probes as localized sources of light.
Light propagation in a conical transparent dielectric probe
Transparent dielectric probes can be modeled as infinitely long glass rods with a conical and pointed end. The analytically known HE11 waveguide mode, incident from the infinite cylindrical glass rod and polarized in the x-direction, excites the field in the conical probe. For weakly guiding fibers, the modes are usually designated LP (linearly polarized). In this case, the fundamental LP01 mode corresponds to the HE11 mode. The tapered, conical part of the probe may be represented as a series of disks with decreasing diameters and infinitesimal thicknesses. At each intersection, the HE11 field distribution adapts to the distribution appropriate for the next slimmer section.
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- Information
- Principles of Nano-Optics , pp. 165 - 200Publisher: Cambridge University PressPrint publication year: 2012