Reflectivity and Phase Control Research for Superresolution Enhancement via the Thin Films Mismatch

Cao, Pengfei; Cheng, Lin; Li, Yuee E.; Zhang, Xiaoping P.; Meng, Qingqing; Kong, Weijie

doi:10.2528/pier10061801

Cited by 5 publications

(7 citation statements)

References 33 publications

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“…So the image contrast can be improved for the impedance mismatch case. It reconfirms that the ARPC-superlens can significantly enhance the image contrast and resolving capability under the constraint relations [23]. Physically, because of large k x , the penetration depth of SPs into the metal is small compared with the film thickness, and therefore SPs at each interface are decoupled.…”

Section: (D) In Contrast To What One Can See In Figs 3(a)-(c) the mentioning

confidence: 60%

“…The proposed ARPC-superlens model is made of a superlens and two thin films [23], as shown in Fig. 1.…”

Section: Spw Dispersion Relation and Work Modes Analysesmentioning

confidence: 99%

“…However, many theories and experiments [20][21][22] demonstrate that the intrinsic losses of metallic superlens can cause quite low transmittance through a metal film, which limits their operating range to wavelengths in the vicinity of the plasma frequency and leads to the low image contrast and the low resolution. To overcome these problems, an AntiReflection and Phase Control coatings superlens (ARPC-superlens) model is presented in our previous work [23]. ARPC-superlens is composed of a metal slab and two finite thickness dielectric media with different permittivities ε 2 and ε 4 , which is called as the finite thickness asymmetric structure.…”

Section: Introductionmentioning

confidence: 99%

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Superresolution Enhancement for the Superlens With Anti-Reflection and Phase Control Coatings via Surface Plasmons Modes of Asymmetric Structure

Cao¹,

Zhang²,

Kong³

et al. 2011

PIER

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Abstract-The paper discusses the reason why the image resolution can be significantly enhanced by the superlens with anti-reflection and phase control coatings (ARPC-superlens) via analyzing the surface plasmons (SPs) modes. ARPC-superlens is an asymmetric structure with finite thickness, in which we first find that there are two asymmetric SPs modes. By comparing the dispersion curve of SPs of ARPC-superlens and the SPs group velocity with their counterparts in the metric ones, we find that the Up Asymmetric Mode and Down Asymmetric Mode are excited within the ARPC-superlens with asymmetric structure. By simulating the aerial images in different SPs modes, the paper also discusses the optimal ratio between the metal slab and the ARPC coatings thickness. The results demonstrate that the subwavelength resolution of ARPC-superlens in Down Asymmetric Mode has been enhanced, when the metal/ARPC thickness ratio is 2:1.

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Section: (D) In Contrast To What One Can See In Figs 3(a)-(c) the mentioning

confidence: 60%

“…The proposed ARPC-superlens model is made of a superlens and two thin films [23], as shown in Fig. 1.…”

Section: Spw Dispersion Relation and Work Modes Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Superresolution Enhancement for the Superlens With Anti-Reflection and Phase Control Coatings via Surface Plasmons Modes of Asymmetric Structure

Cao¹,

Zhang²,

Kong³

et al. 2011

PIER

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“…CSP, which is excited at metal annular slits, is closely related to the permittivity of metal [18] . The image part of metal's permittivity is associated with the intrinsic losses of metal [3] . In our lens structure, it is benefit for the subwavelength annular slits exciting diffracted cylindrical waves to launch CSP when value of metal's intrinsic-loss is higher.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…This resolution limit can be overcome by use of focusing the evanescent waves in the near-field region. The concept of "superlens" [1] , which can provide higher resolution beyond the diffraction limit have been proved [2][3][4][5] , was proposed firstly by Pendry in 2000. Plasmonic lens is attracting much interest recently due to its unique feature of exordinary enhanced transmission and super-resolution [6][7] .…”

Section: Introductionmentioning

confidence: 99%

Far-Field Tunable Nano-Focusing Based on Metallic Slits Surrounded With Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric Grating

Cao

Liao

Zhang

et al. 2013

PIER

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Abstract-In this work, we present a new design of a tunable nanofocusing lens using a circular grating of linear-variant depths and nonlinear-variant widths. Constructive interference of cylindrical surface plasmon launched by the subwavelength metallic structure forms a subdiffraction-limited focus, the focal length can be adjusted by varying the geometry of each groove in the circular grating. According to the numerical calculation, the range of focusing points shift is much more than other plasmonic lens, and the relative phase of emitting light scattered by surface plasmon coupling circular grating can be modulated by the nonlinear-variant width and linear-variant depth. The simulation result indicates that the different relative phase of emitting light lead to variant focal length. We firstly show a unique phenomenon for the linear-variant depths and nonlinear-variant widths of the circular grating that the positive change and negative change of the depths and widths of grooves can result in different of variation trend between relative phases and focal lengths. These results paved the road for utilizing the plasmonic lens in high-density optical storage, nanolithography, superresolution optical microscopic imaging, optical trapping, and sensing.

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A Holly-Leaf-Shaped Monopole Antenna With Low RCS for Uwb Application

dVdvNioONAp¹,

Hou²,

Lan³

et al. 2011

PIER

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Abstract-As to low observable platform, one of the major contributing sources of target RCS is the scattering due to onboard antennas. So the research on RCS reduction of the antenna is important. In this paper, a holly-leaf-shaped monopole antenna with low RCS is designed. A square notch is etched to improve impedance matching and expand the bandwidth in the ground. The measured −10 dB bandwidth is from 2.1 to 15.4 GHz (only a little higher than −10 dB around 7.5 GHz). The radiation patterns retain symmetry and are relatively stable at 2.5, 8 and 11 GHz. The monostatic RCS performance in four different incident cases is studied to obtain some helpful conclusions for the RCS reduction of the UWB antenna. The RCS achieves effective reduction in comparison with that of the reference antenna. The largest reduction is 4.1, 19.8, 3.9 dBsm in three different incident cases, respectively, while the largest loss of gain is only about −1.3 dB. The antenna suits the occasion of desiring UWB antenna with low RCS.

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Reflectivity and Phase Control Research for Superresolution Enhancement via the Thin Films Mismatch

Cited by 5 publications

References 33 publications

Superresolution Enhancement for the Superlens With Anti-Reflection and Phase Control Coatings via Surface Plasmons Modes of Asymmetric Structure

Superresolution Enhancement for the Superlens With Anti-Reflection and Phase Control Coatings via Surface Plasmons Modes of Asymmetric Structure

Far-Field Tunable Nano-Focusing Based on Metallic Slits Surrounded With Nonlinear-Variant Widths and Linear-Variant Depths of Circular Dielectric Grating

A Holly-Leaf-Shaped Monopole Antenna With Low RCS for Uwb Application

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