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3D optical Yagi-Uda nanoantenna array.

Dregely D, Taubert R, Dorfmüller J, Vogelgesang R, Kern K, Giessen H - Nat Commun (2011)

Bottom Line: We show that the concepts of radiofrequency antenna arrays can be applied to the optical regime proving superior directional properties compared with a single planar optical antenna, particularly for emission and reception into the third dimension.Measuring the optical properties of the structure reveals that impinging light on the array is efficiently absorbed on the subwavelength scale because of the high directivity.Moreover, we show in simulations that combining the array with suitable feeding circuits gives rise to the prospect of beam steering at optical wavelengths.

View Article: PubMed Central - PubMed

Affiliation: 4th Physics Institute and Research Center SCoPE, University of Stuttgart, D-70569 Stuttgart, Germany.

No MeSH data available.


Related in: MedlinePlus

The optical Yagi–Uda antenna array.(a) Schematic picture of the optical Yagi–Uda antenna array. The period in x-direction is Px=450 nm and in y-direction Py=300 nm. The inset shows the single antenna with definitions of the geometrical parameters: Lr=300 nm, Lf=250 nm, Ld=230 nm and S=100 nm. (b) Scanning electron microscope image of the optical Yagi–Uda antenna array. The gold structure is fabricated on a glass substrate. The nanorods are embedded in a photopolymer (PC403), which serves as the dielectric spacer. Scale bar, 500 nm.
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f1: The optical Yagi–Uda antenna array.(a) Schematic picture of the optical Yagi–Uda antenna array. The period in x-direction is Px=450 nm and in y-direction Py=300 nm. The inset shows the single antenna with definitions of the geometrical parameters: Lr=300 nm, Lf=250 nm, Ld=230 nm and S=100 nm. (b) Scanning electron microscope image of the optical Yagi–Uda antenna array. The gold structure is fabricated on a glass substrate. The nanorods are embedded in a photopolymer (PC403), which serves as the dielectric spacer. Scale bar, 500 nm.

Mentions: Figure 1a shows a schematic picture of the array, in which the period is chosen to be 450 nm in x-direction and 300 nm in y-direction. The inset depicts the geometry of the single three-layer Yagi–Uda antenna in the array, in which the central element is the feed (Lf=250 nm) sandwiched between the back reflector (Lr=300 nm) and the front director (Ld=230 nm). The distance between each layer is 100 nm.


3D optical Yagi-Uda nanoantenna array.

Dregely D, Taubert R, Dorfmüller J, Vogelgesang R, Kern K, Giessen H - Nat Commun (2011)

The optical Yagi–Uda antenna array.(a) Schematic picture of the optical Yagi–Uda antenna array. The period in x-direction is Px=450 nm and in y-direction Py=300 nm. The inset shows the single antenna with definitions of the geometrical parameters: Lr=300 nm, Lf=250 nm, Ld=230 nm and S=100 nm. (b) Scanning electron microscope image of the optical Yagi–Uda antenna array. The gold structure is fabricated on a glass substrate. The nanorods are embedded in a photopolymer (PC403), which serves as the dielectric spacer. Scale bar, 500 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3104549&req=5

f1: The optical Yagi–Uda antenna array.(a) Schematic picture of the optical Yagi–Uda antenna array. The period in x-direction is Px=450 nm and in y-direction Py=300 nm. The inset shows the single antenna with definitions of the geometrical parameters: Lr=300 nm, Lf=250 nm, Ld=230 nm and S=100 nm. (b) Scanning electron microscope image of the optical Yagi–Uda antenna array. The gold structure is fabricated on a glass substrate. The nanorods are embedded in a photopolymer (PC403), which serves as the dielectric spacer. Scale bar, 500 nm.
Mentions: Figure 1a shows a schematic picture of the array, in which the period is chosen to be 450 nm in x-direction and 300 nm in y-direction. The inset depicts the geometry of the single three-layer Yagi–Uda antenna in the array, in which the central element is the feed (Lf=250 nm) sandwiched between the back reflector (Lr=300 nm) and the front director (Ld=230 nm). The distance between each layer is 100 nm.

Bottom Line: We show that the concepts of radiofrequency antenna arrays can be applied to the optical regime proving superior directional properties compared with a single planar optical antenna, particularly for emission and reception into the third dimension.Measuring the optical properties of the structure reveals that impinging light on the array is efficiently absorbed on the subwavelength scale because of the high directivity.Moreover, we show in simulations that combining the array with suitable feeding circuits gives rise to the prospect of beam steering at optical wavelengths.

View Article: PubMed Central - PubMed

Affiliation: 4th Physics Institute and Research Center SCoPE, University of Stuttgart, D-70569 Stuttgart, Germany.

No MeSH data available.


Related in: MedlinePlus