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Graphene plasmonic lens for manipulating energy flow.

Wang G, Liu X, Lu H, Zeng C - Sci Rep (2014)

Bottom Line: Because photons are uncharged, it is still difficult to effectively control them by electrical means.It is found that the proposed lens can be utilized to focus and collimate the GP waves propagating along the graphene sheet.As an application of such a lens, the image transfer of two point sources with a separation of λ₀/30 is demonstrated.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.

ABSTRACT
Manipulating the energy flow of light is at the heart of modern information and communication technologies. Because photons are uncharged, it is still difficult to effectively control them by electrical means. Here, we propose a graphene plasmonic (GP) lens to efficiently manipulate energy flow by elaborately designing the thickness of the dielectric spacer beneath the graphene sheet. Different from traditional metal-based lenses, the proposed graphene plasmonic lens possesses the advantages of tunability and excellent confinement of surface plasmons. It is found that the proposed lens can be utilized to focus and collimate the GP waves propagating along the graphene sheet. Particularly, the lens is dispersionless over a wide frequency range and the performance of lens can be flexibly tuned by adjusting the bias voltage. As an application of such a lens, the image transfer of two point sources with a separation of λ₀/30 is demonstrated.

No MeSH data available.


Related in: MedlinePlus

Image transfer in the graphene-based Selfoc lens.(a) Lateral profile of the input intensity of GP waves. (b) y component of electric field (Ey) of GP waves: the image of two point sources separated by a distance of λ0/30 ( = 250 nm) is transferred through the Selfoc lens. (c) Lateral profile of the output intensity of GP waves. In calculations, the incident frequency of the two point sources is 40 THz.
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f7: Image transfer in the graphene-based Selfoc lens.(a) Lateral profile of the input intensity of GP waves. (b) y component of electric field (Ey) of GP waves: the image of two point sources separated by a distance of λ0/30 ( = 250 nm) is transferred through the Selfoc lens. (c) Lateral profile of the output intensity of GP waves. In calculations, the incident frequency of the two point sources is 40 THz.

Mentions: As an important application, we demonstrate the image transfer in the graphene-based Selfoc lens. As depicted in Fig. 7 (b), two incident point sources are separated by a distance of λ0/30 ( = 250 nm) and the excited guided GP waves can propagate along the graphene. The intensity of GP waves at the output interface of the image transfer system is presented in Fig. 7(c). Comparing with the input intensity of GP waves in Fig. 7(a), the image of the two point sources can be well resolved at the output interface with a separation of 250.4 nm. It is found that the separation between the output intensity peaks only has 0.16% change. Especially, the separation between input intensity peaks is only λ0/30, which implies that such graphene-based lens can overcome the diffraction limit and realize image transfer on a monolayer graphene without distortion.


Graphene plasmonic lens for manipulating energy flow.

Wang G, Liu X, Lu H, Zeng C - Sci Rep (2014)

Image transfer in the graphene-based Selfoc lens.(a) Lateral profile of the input intensity of GP waves. (b) y component of electric field (Ey) of GP waves: the image of two point sources separated by a distance of λ0/30 ( = 250 nm) is transferred through the Selfoc lens. (c) Lateral profile of the output intensity of GP waves. In calculations, the incident frequency of the two point sources is 40 THz.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3921639&req=5

f7: Image transfer in the graphene-based Selfoc lens.(a) Lateral profile of the input intensity of GP waves. (b) y component of electric field (Ey) of GP waves: the image of two point sources separated by a distance of λ0/30 ( = 250 nm) is transferred through the Selfoc lens. (c) Lateral profile of the output intensity of GP waves. In calculations, the incident frequency of the two point sources is 40 THz.
Mentions: As an important application, we demonstrate the image transfer in the graphene-based Selfoc lens. As depicted in Fig. 7 (b), two incident point sources are separated by a distance of λ0/30 ( = 250 nm) and the excited guided GP waves can propagate along the graphene. The intensity of GP waves at the output interface of the image transfer system is presented in Fig. 7(c). Comparing with the input intensity of GP waves in Fig. 7(a), the image of the two point sources can be well resolved at the output interface with a separation of 250.4 nm. It is found that the separation between the output intensity peaks only has 0.16% change. Especially, the separation between input intensity peaks is only λ0/30, which implies that such graphene-based lens can overcome the diffraction limit and realize image transfer on a monolayer graphene without distortion.

Bottom Line: Because photons are uncharged, it is still difficult to effectively control them by electrical means.It is found that the proposed lens can be utilized to focus and collimate the GP waves propagating along the graphene sheet.As an application of such a lens, the image transfer of two point sources with a separation of λ₀/30 is demonstrated.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.

ABSTRACT
Manipulating the energy flow of light is at the heart of modern information and communication technologies. Because photons are uncharged, it is still difficult to effectively control them by electrical means. Here, we propose a graphene plasmonic (GP) lens to efficiently manipulate energy flow by elaborately designing the thickness of the dielectric spacer beneath the graphene sheet. Different from traditional metal-based lenses, the proposed graphene plasmonic lens possesses the advantages of tunability and excellent confinement of surface plasmons. It is found that the proposed lens can be utilized to focus and collimate the GP waves propagating along the graphene sheet. Particularly, the lens is dispersionless over a wide frequency range and the performance of lens can be flexibly tuned by adjusting the bias voltage. As an application of such a lens, the image transfer of two point sources with a separation of λ₀/30 is demonstrated.

No MeSH data available.


Related in: MedlinePlus