Measurement of the depletion beam focal spot using near-field scanning optical microscopy probes

McBride, Daniel; Su, C. B.

doi:10.1088/0957-0233/24/12/125204

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…Furthermore, the Richard and Wolf formula is valid even for numerical aperture approaching one [24]. Using a microscope objective with NA = 0.85, the spatial profile of the focal spot predicted by the Richard and Wolf formula agreed very well with experimentally measured profile using a scanning NSOM probe [21].…”

Section: Image Plane Formulasupporting

confidence: 65%

“…With formulas given above and the numerical aperture of the microscope objective and the input beam parameters specified, it is shown that the focal spot spatial profile agrees very well with the measured profile using a NSOM tip in the collection mode of operation [21] If the focal plane is to be shifted away from the origin of the particle, then simply make the following change in the expression for I 0 , I 1 , and I 2 :…”

Section: Appendixmentioning

confidence: 56%

“…The additional factor F(θ) describes the specified microscope objective focusing of an incoming collimated Gaussian beam. F(θ) is given by [21].…”

Section: Appendixmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of a photonic nanojet assuming a focused incident beam instead of a plane wave

Dong¹,

Su²

2014

J. Opt.

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The analysis of a photonic nanojet formed by dielectric spheres almost always assumes that the incident field is a plane wave. In this work, using vector spherical harmonics representations, we analyze the case of a more realistic incident field consisting of a focused beam formed by a microscope objective. Also included is the situation in which the sphere is not at the focal plane of the focus beam. We find that the dimension of the nanojet beam waist is less sensitive with respect to the azimuthal angle when compared with the plane wave case. Also, by shifting the particle away from the focal plane, the nanojet beam waist can be positioned outside the particle which otherwise would be inside or at the particle surface. Inherently, no such adjustment is possible with an incident plane wave assumption.

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Section: Image Plane Formulasupporting

confidence: 65%

Section: Appendixmentioning

confidence: 56%

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Analysis of a photonic nanojet assuming a focused incident beam instead of a plane wave

Dong¹,

Su²

2014

J. Opt.

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A simple determination approach for zero-padding of FFT method in focal spot calculation

Zhang

Xiao

Zhong

2019

Optics Communications

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Plasmonic-nanowire near-field beam analyzer

Peng,

Zhu,

et al. 2024

Nanophotonics

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Experimental near-field analysis of the output beams from the end faces of micro/nano-waveguide is very necessary, because important information such as spatial intensity distributions, mode orders, and divergence angles can be obtained, and are very important for investigating and designing nanophotonic devices. However, as far as we know, it has not been demonstrated yet. In this work, we experimentally demonstrate a plasmonic-nanowire near-field beam analyzer, utilizing a single Au nanowire (AuNW) as the probe to scan the spatial near-field distributions of emitted beams from micro/nano-waveguide end-faces. Our analyzer can resolve the trade-off between high measurement resolution and light collection efficiency in conventional beam analyzers by a reverse nanofocusing process, achieving a probe resolution of 190 nm (<λ/8) and a simulated collection efficiency of ∼47.4 % at λ = 1596 nm. These attractive advantages allow us to obtain three‐dimensional (3D) scanning in a large range from the plasmonic hotspot region to the far-field region, characterizing the 3D spatial distribution evolution from a metal nanowire output beam for the first time, with an M 2 factor lower than that of the ideal Gaussian beam (M 2 = 1). In addition, the analyzer also demonstrates simultaneous characterization of multimodes in irregular and large-sized nanoribbons, further verifying its ability to selectively explore complex multimodes that are difficult to be predicted by numerical simulations. Our results suggest that this plasmonic-nanowire beam analyzer may hold promise for diverse near-field applications for micro/nano-waveguides such as nanolasers and biosensing, and offer a new method for understanding nanophotonic structures.

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Measurement of the depletion beam focal spot using near-field scanning optical microscopy probes

Cited by 3 publications

References 25 publications

Analysis of a photonic nanojet assuming a focused incident beam instead of a plane wave

Analysis of a photonic nanojet assuming a focused incident beam instead of a plane wave

A simple determination approach for zero-padding of FFT method in focal spot calculation

Plasmonic-nanowire near-field beam analyzer

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