Obtaining super resolution light spot using surface plasmon assisted sharp ridge nanoaperture

Jin, Eric X.; Xu, Xianfan

doi:10.1063/1.1875747

Cited by 133 publications

(106 citation statements)

References 22 publications

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“…The smaller the cone half-angle is, the faster the modes attenuate. This can explain why large taper angle may improve the light throughout in aperture probe which finds an important application in scanning near-field optical microscopy [13]. (3) As follows from our calculations, we find that in the propagating region the attentuation of some modes decays faster than those of others, and one mode after the other reaches cutoff in the tapered hollow metallic waveguide as the distance from the cone vertex decreases.…”

Section: Discussionsupporting

confidence: 50%

Electromagnetic fields and transmission properties in tapered hollow metallic waveguides

Zeng

Fan

2008

Opt. Express

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Abstract:We analyze the electromagnetic spatital distributions and address an important issue of the transmission properties of spherical transverseelectric (TE) and transverse-magnetic (TM) eigenmodes within a tapered hollow metallic waveguide in detail. Explicit analytical expressions for the spatital distributions of electromagnetic field components, attenuation constant, phase constant and wave impedance are derived. Accurate eigenvalues obtained numerically are used to study the dependences of the transmission properties on the taper angle, the mode as well as the length of the waveguide. It is shown that all modes run continuously from a propagating through a transition to an evanescent region and the value of the attenuation increases as the distance from the cone vertex and the cone angle decrease. A strict distinction between pure propagating and pure evanescent modes cannot be achieved. One mode after the other reaches cutoff in the tapered hollow metallic waveguide as the distance from the cone vertex desreases.

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Section: Discussionsupporting

confidence: 50%

Electromagnetic fields and transmission properties in tapered hollow metallic waveguides

Zeng

Fan

2008

Opt. Express

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“…Recently, another method to increase the near-field intensity in the vicinity of subwavelength apertures in screen by surface plasmons has been proposed [18,19]. By carefully designing the apertures, favourable conditions for an efficient excitation of plasmons are created.…”

Section: Introductionmentioning

confidence: 99%

Corrugated SNOM probe with enhanced energy throughput

Antosiewicz

Szoplik

2008

Opto-Electronics Review

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In a previous paper we proposed a modification of metal-coated tapered-fibre aperture probes for scanning near-field optical microscopes (SNOMs). The modification consists in radial corrugations of the metal-dielectric interface oriented inward the core. Their purpose is to facilitate the excitation of surface plasmons, which increase the transport of energy beyond the cut-off diameter and radiate a quasi-dipolar field from the probe output rim. An increase in energy output allows for reduction of the apex diameter, which is the main factor determining the resolution of the microscope. In two-dimensional finite-difference time-domain (FDTD) simulations we analyse the performance of the new type of SNOM probe. We admit, however, that the two-dimensional approximation gives better results than expected from exact three-dimensional ones. Nevertheless, optimisation of enhanced energy throughput in corrugated probes should lead to at least twice better resolution with the same sensitivity of detectors available nowadays.

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“…The associated diffraction pattern is directly related to the resolution of type-I ABIDs. To our knowledge, almost all of the publications to date that have investigated light transmission through apertures [1][2][3][4][5][6], employed this geometry or other closely related geometries.…”

Section: Introductionmentioning

confidence: 99%

“…The unique transmission and diffraction properties of a subwavelength circular aperture [1], a single nanoaperture with designed shapes [2,3], a single nanoaperture surrounded by corrugated surface [4] or a tightly-spaced nanoaperture array [5,6] have all been studied and reported in the recent past. While the transmission properties of subwavelength apertures are yet to be fully understood from the theoretical standpoint, subwavelength apertures have been used to demonstrate some remarkable improvements in areas such as bio-molecule analysis [7,8], sensing [9], recording & storage [10], laser technology [11], as well as photolithography [12].…”

Section: Introductionmentioning

confidence: 99%

Characterization of light collection through a subwavelength aperture from a point source

Heng¹,

Cui²,

Knapp³

et al. 2006

Opt. Express

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Abstract:We experimentally measure and theoretically model the light transmission characteristics of subwavelength apertures. The characterization consists of translating a point source at varying vertical height and lateral displacement from the aperture and measuring the resulting transmission. We define the variation of the transmission with lateral source displacement as the collection mode point spread function (CPSF). This transmission geometry is particularly relevant to subwavelength aperture based imaging devices and enables determination of their resolution. This study shows that the achieved resolutions degrade as a function of sample height and that the behavior of sensor devices based on the use of apertures for detection is different from those devices where the apertures are used as light sources. In addition, we find that the measured CPSF is dependent on the collection numerical aperture (NA). Finally, we establish that resolution beyond the diffraction limit for a nominal optical wavelength of 650 nm and nominal medium refractive index of 1.5 is achievable with subwavelength aperture based devices when the aperture size is smaller than 225 nm. Akhremitchev, "Imaging of optical field confinement in ridge waveguides fabricated on very-smallaperture laser," Appl.

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Obtaining super resolution light spot using surface plasmon assisted sharp ridge nanoaperture

Cited by 133 publications

References 22 publications

Electromagnetic fields and transmission properties in tapered hollow metallic waveguides

Electromagnetic fields and transmission properties in tapered hollow metallic waveguides

Corrugated SNOM probe with enhanced energy throughput

Characterization of light collection through a subwavelength aperture from a point source

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