Mechanisms for extraordinary optical transmission through bull’s eye structures

Carretero‐Palacios, Sol; Mahboub, O.; García‐Vidal, F. J.; Martín‐Moreno, Luis; Rodrigo, Sergio G.; Genet, Cyriaque; Ebbesen, Thomas W.

doi:10.1364/oe.19.010429

Cited by 70 publications

(51 citation statements)

References 27 publications

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“…around the aperture [20,23,24], as shown in Figures 3C and D respectively. This phenomenon of extraordinary optical transmission (EOT) essentially results from a combination of propagating SP, grating effect, and scattering evanescent fields [19], and has received significant attention.…”

Section: Figure 3 (A)mentioning

confidence: 82%

“…The power transmitted or scattered by the nanostructures to the desired region is another important criteria or an FOM for evaluating NFT's performance. The total diffracted power could exceed the irradiation on the open area of the aperture or the area of a nanoparticle, i.e., EOT [19][20][21][22][23][24]. It should be noted that an issue associated with the transmittance FOM is that it is often evaluated in the absence of the recording medium.…”

Section: Figure 3 (A)mentioning

confidence: 99%

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Plasmonic near-field transducer for heat-assisted magnetic recording

Zhou

Hammack³

et al. 2014

Nanophotonics

136

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Plasmonic devices, made of apertures or antennas, have played significant roles in advancing the fields of optics and opto-electronics by offering subwavelength manipulation of light in the visible and near infrared frequencies. The development of heat-assisted magnetic recording (HAMR) opens up a new application of plasmonic nanostructures, where they act as near field transducers (NFTs) to locally and temporally heat a sub-diffractionlimited region in the recording medium above its Curie temperature to reduce the magnetic coercivity. This allows use of very small grain volume in the medium while still maintaining data thermal stability, and increasing storage density in the next generation hard disk drives (HDDs). In this paper, we review different plasmonic NFT designs that are promising to be applied in HAMR. We focus on the mechanisms contributing to the coupling and confinement of optical energy. We also illustrate the self-heating issue in NFT materials associated with the generation of a confined optical spot, which could result in degradation of performance and failure of components. The possibility of using alternative plasmonic materials will be discussed.

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Section: Figure 3 (A)mentioning

confidence: 82%

Section: Figure 3 (A)mentioning

confidence: 99%

Plasmonic near-field transducer for heat-assisted magnetic recording

Zhou

Hammack³

et al. 2014

Nanophotonics

136

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“…Therefore, this focusing ensures a high confinement in the center of the "bull-eye" (BE) structure, which enhances the EOT in the nanohole incrementally with the ring-grooves. The total transmittance intensity through the hole can be expressed as [29]:…”

Section: þmentioning

confidence: 99%

Plasmonic Nanostructure Arrays Coupled with a Quantum Emitter

Rivera¹,

Silva²,

Ledemi

et al. 2014

SpringerBriefs in Physics

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In the previous chapter, we saw that a metal nanoparticle (NP) can generate localized surface plasmon resonance (LSPR), as a result of the resonance of free electrons on a curved surface. We also mentioned the main difference between surface plasmon polaritons (SPP) and LSPR, namely that SPPs are propagating waves, while LSPR is a nonpropagating excitation of free electrons in a metallic nanostructure coupled to an EM field. In this chapter, we will see that SPPs in restricted geometries (such as nanoantennas or nanocavities) can also generate LSPR. Nevertheless, the conditions for excitation are different. LSPR can be excited by direct application of light, whereas SPPs can be excited by matching the frequency and momentum of the excitation light and the SPPs. For example, under laser illumination, an antenna develops a strong dipole along the antenna. Charge oscillations inside each arm give rise to strong EM fields inside the feedgap of the antenna. When the antenna is resonant at optical frequencies, it can be called a resonant nanoantenna. In this case, with sufficiently close spacing with respect to a quantum emitter (QE) and nanoantenna, they can interact forming an electric dipole.On the other hand, the extremely high localized fields in plasmonic nanocavities or plasmonic resonators, although they generally have low quality factors Q, are able to confine modes to sub-wavelength volumes V. Thus, plasmonic nanocavities become much more competitive with conventional optical resonators for applications where a resonance confined to a small volume is desirable. Hence, a nanocavity can profoundly change the number of EM modes and decay pathways available to a QE, increasing or decreasing its radiative decay rate. In both cases (nanoantenna and nanocavity), we can manipulate the local density of optical states (LDOS) of the QE, and increase the efficiency of light emission from the QEs.

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“…This ensures a two-dimensional field confinement. It has been theoretically and experimentally verified that circular plasmonic gratings can lower the divergence of transmitted light from subwavelength apertures [22,23] and effectively overcome the diffraction limit [24,25]. These features suggested further exploitations of circular gratings and the application regime has been largely broadened in the more recent past.…”

Section: Introductionmentioning

confidence: 99%

Enhancing resonances of optical nanoantennas by circular gratings

Qi¹,

Kaiser²,

Klein³

et al. 2015

Opt. Express

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Optical plasmonic antennas allow for localizing and enhancing light at the nanoscale. To enhance the application opportunities of optical antennas, their quality factor needs to be substantially improved. Here, we numerically and experimentally demonstrate that the resonance of a dipolar metallic disc antenna can be enhanced by a circular grating that obeys the Bragg condition. The supporting grating effectively collects energy from an extended spatial domain and guides it spectrally-selected into the central antenna, leading to a significantly enhanced field intensity at resonance. Accordingly, the quality factor of the antenna is enhanced by at least five times. The approach can be applied to other plasmonic systems, hence constituting an important ingredient to a future plasmonic tool box. References and links1. L. Novotny and N. van Hulst, "Antennas for light," Nature Photon. 5, 83-90 (2011). 2. P. Bharadwaj, B. Deutsch, and L. Novotny, "Optical antennas," Adv. Opt. Photon. 1(3), 438-483 (2009)

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Mechanisms for extraordinary optical transmission through bull’s eye structures

Cited by 70 publications

References 27 publications

Plasmonic near-field transducer for heat-assisted magnetic recording

Plasmonic near-field transducer for heat-assisted magnetic recording

Plasmonic Nanostructure Arrays Coupled with a Quantum Emitter

Enhancing resonances of optical nanoantennas by circular gratings

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