A Plasmonic Dimple Lens for Nanoscale Focusing of Light

Vedantam, Shantha; Lee, Hyojune; Tang, Japeck; Conway, Josh; Staffaroni, Matteo; Yablonovitch, Eli

doi:10.1021/nl9016368

Cited by 122 publications

(72 citation statements)

References 28 publications

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“…The SP wave is associated with a shorter wavelength than light in free space and a stronger field enhancement effect near the interface. Because of the shorter effective wavelength, the SP wave can be focused into a highly confined spot with a scale beyond the diffraction limit, making it very attractive for future photonic applications in many areas such as nano-optics, 1,2) superresolution imaging, 3,4) nanolithography, 5,6) optical recording, 7,8) waveguiding, 9,10) near-field imaging, sensing, 11,12) and biochemical sensing. 13,14) A plasmonic lens (PL) is a promising photonic device utilizing the SP wave.…”

Section: Introductionmentioning

confidence: 99%

Improvement of focusing characteristics of a spiral plasmonic lens

Okuda

Kimura

Takeda

et al. 2014

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We designed and fabricated a spiral plasmonic lens (PL) with multi-circular grooves to increase light intensity in a farfield region via the constructive interference of the light scattered by the multi-circular grooves. To compare the beam focusing characteristics of a spiral PL with multi-circular grooves with those of a conventional spiral PL, we simulated the electric field distribution of the PLs operating at a 405 nm wavelength. We confirmed that the light intensity increased about twofold at 0.75 m above the PL surface owing to the effect of the multi-circular grooves. Furthermore, the circular grooves negligibly affect the full width at half-maximum of the focal spot, keeping the subwavelength size ($200 nm) of incident light. #

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Section: Introductionmentioning

confidence: 99%

Improvement of focusing characteristics of a spiral plasmonic lens

Okuda

Kimura

Takeda

et al. 2014

OPT REV

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“…When tuned to be in resonance with the illuminating light wave, they convert propagating free-space radiation into highly concentrated near fields in feed gaps between them [10][11][12][13] or at the rod extremities. [14][15][16][17] Alternatively, nanofocusing of light can be achieved by the compression of SPP propagating along tapered metal nanowires [18][19][20][21][22][23] or slot waveguides. 12 In contrast to antenna focusing, a propagating surface wave is focused.…”

Section: Introductionmentioning

confidence: 99%

Efficient excitation of a monopole optical transducer for near-field recording

Peng

2012

Journal of Applied Physics

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An optical near-field transducer composed of a rectangular patch and a protruded peg has been numerically studied for heat-assisted magnetic recording. This transducer strongly interacts with a planar solid immersion focusing field and efficiently couples optical energy into a recording medium in a region determined by the peg cross-section. The transducer is excited through the electric field predominantly normal to its edges. The optimal size of the rectangular patch is found to be a half-wave optical antenna in height and between half-wave and full-wave in width.

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“…The concentration of the radiation energy and the consequent field enhancement within nano-scale regions can be achieved by utilizing surface plasmon polaritons (SPPs) [1][2][3][4][5][6][7][8][9], which can substantially overcome the diffraction limit of conventional focusing optics. Devices for nano-scale energy concentration are widely applicable in white light super-continuum generation [1], nonlinear optical control [10,11], and surface-enhanced Raman scattering (SERS) [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Surface-Wave Description for the Nano-scale Energy Concentration with Resonant Dipole Antennas

Jia¹,

Lalanne²,

Liu³

2015

Plasmonics

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Resonant optical dipole nano-antennas allow giant field enhancement within nano-gaps. To show how the energy of external illumination waves is delivered and concentrated in nano-gaps, we build up a model by considering the dynamical launching and multiple scattering processes of surface plasmon polaritions (SPPs) on both antenna arms. The model captures the main feature of the antenna resonance as evidenced by comparison of the model prediction with fully vectorial numerical results and provides an intuitive picture that the energy of external wave is initially transferred into SPP and is then coupled into the nano-gap. The enhanced field in the nano-gap oscillates quasi-periodically with the increase of the antenna-arm length, and the resonance peaks can be predicted with a phase-matching condition derived from the model, showing that antenna resonance is due to a constructive interference of the multiple-scattered SPPs. Analytical equation for determining the complex resonance wavelength and the quality factor of the resonant modes is obtained. The model however exhibits observable deviation from fully vectorial numerical results for the lowest resonance order (for antenna with the shortest arms), evidencing that, for this case, surface waves other than SPPs contribute to the antenna resonance.The present results are helpful for clarifying the underlying physics for the energy concentration with resonant dipole antennas and may provide recipes for intuitive design of antenna devices, such as those used for optical nonlinearity enhancement and biochemical sensing.

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A Plasmonic Dimple Lens for Nanoscale Focusing of Light

Cited by 122 publications

References 28 publications

Improvement of focusing characteristics of a spiral plasmonic lens

Improvement of focusing characteristics of a spiral plasmonic lens

Efficient excitation of a monopole optical transducer for near-field recording

Comprehensive Surface-Wave Description for the Nano-scale Energy Concentration with Resonant Dipole Antennas

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