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Realization of deep subwavelength resolution with singular media.

Xu S, Jiang Y, Xu H, Wang J, Lin S, Chen H, Zhang B - Sci Rep (2014)

Bottom Line: The record of imaging resolution has kept being refreshed in the past decades and the best resolution of hyperlenses and superlenses so far is about one out of tens in terms of wavelength.The meta-lens is made of subwavelength metal/air layers, which exhibit singular medium property over a broad band.As a proof of concept, the subwavelength imaging ability is demonstrated over a broad frequency band from 1.5-10 GHz with the resolution varying from 1/117 to 1/17 wavelength experimentally.

View Article: PubMed Central - PubMed

Affiliation: 1] The Electromagnetics Academy at Zhejiang University, Zhejiang University, Hangzhou 310027, China [2] State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China [3] Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore [4] Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore.

ABSTRACT
The record of imaging resolution has kept being refreshed in the past decades and the best resolution of hyperlenses and superlenses so far is about one out of tens in terms of wavelength. In this paper, by adopting a hybrid concept of transformation optics and singular media, we report a broadband meta-lens design methodology with ultra-high resolution. The meta-lens is made of subwavelength metal/air layers, which exhibit singular medium property over a broad band. As a proof of concept, the subwavelength imaging ability is demonstrated over a broad frequency band from 1.5-10 GHz with the resolution varying from 1/117 to 1/17 wavelength experimentally.

No MeSH data available.


Related in: MedlinePlus

The effective 3D scheme of our practical meta-lens for microwave.The inner and outer radius are r = 1.5 mm and R = 500 mm respectively. The height of meta-lens in z direction is h = 200 mm and the azimuthal periodicity of the tube divided by 0.03 mm-thick Cleanwrap® aluminum foils is 10 degree.
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f3: The effective 3D scheme of our practical meta-lens for microwave.The inner and outer radius are r = 1.5 mm and R = 500 mm respectively. The height of meta-lens in z direction is h = 200 mm and the azimuthal periodicity of the tube divided by 0.03 mm-thick Cleanwrap® aluminum foils is 10 degree.

Mentions: Fig. 3 shows the schematic of microwave meta-lens we realized. In order to simplify the fabrication, we separate the semicircle of the meta-lens into 18 tubes by 0.03 mm-thick Cleanwrap® aluminum foils and therefore the azimuthal periodicity of the tube is 10 degree. The metal-air structures are fixed by two pieces of synthetic glasses, whose radius of inner semicircle and of outer semicircle are r = 1.5 mm and R = 500 mm respectively. The height of the meta-lens in z direction is h = 200 mm. Two slits, with the width of 0.3 mm and height of 200 mm on a horn antenna covered by an aluminum foil, are used as two separated point sources in the experiment. The distance between two slits is 1.7 mm. In the experiment, a composite source, which is subwavelength, is connected to the meta-lens with contact terminals. According to the calculation above, the effective permittivities close to the inner semicircle are εϕ = ε⊥ = 1.1 and ερ = ε//→∞, which match the requirement of meta-lens.


Realization of deep subwavelength resolution with singular media.

Xu S, Jiang Y, Xu H, Wang J, Lin S, Chen H, Zhang B - Sci Rep (2014)

The effective 3D scheme of our practical meta-lens for microwave.The inner and outer radius are r = 1.5 mm and R = 500 mm respectively. The height of meta-lens in z direction is h = 200 mm and the azimuthal periodicity of the tube divided by 0.03 mm-thick Cleanwrap® aluminum foils is 10 degree.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4048882&req=5

f3: The effective 3D scheme of our practical meta-lens for microwave.The inner and outer radius are r = 1.5 mm and R = 500 mm respectively. The height of meta-lens in z direction is h = 200 mm and the azimuthal periodicity of the tube divided by 0.03 mm-thick Cleanwrap® aluminum foils is 10 degree.
Mentions: Fig. 3 shows the schematic of microwave meta-lens we realized. In order to simplify the fabrication, we separate the semicircle of the meta-lens into 18 tubes by 0.03 mm-thick Cleanwrap® aluminum foils and therefore the azimuthal periodicity of the tube is 10 degree. The metal-air structures are fixed by two pieces of synthetic glasses, whose radius of inner semicircle and of outer semicircle are r = 1.5 mm and R = 500 mm respectively. The height of the meta-lens in z direction is h = 200 mm. Two slits, with the width of 0.3 mm and height of 200 mm on a horn antenna covered by an aluminum foil, are used as two separated point sources in the experiment. The distance between two slits is 1.7 mm. In the experiment, a composite source, which is subwavelength, is connected to the meta-lens with contact terminals. According to the calculation above, the effective permittivities close to the inner semicircle are εϕ = ε⊥ = 1.1 and ερ = ε//→∞, which match the requirement of meta-lens.

Bottom Line: The record of imaging resolution has kept being refreshed in the past decades and the best resolution of hyperlenses and superlenses so far is about one out of tens in terms of wavelength.The meta-lens is made of subwavelength metal/air layers, which exhibit singular medium property over a broad band.As a proof of concept, the subwavelength imaging ability is demonstrated over a broad frequency band from 1.5-10 GHz with the resolution varying from 1/117 to 1/17 wavelength experimentally.

View Article: PubMed Central - PubMed

Affiliation: 1] The Electromagnetics Academy at Zhejiang University, Zhejiang University, Hangzhou 310027, China [2] State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China [3] Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore [4] Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore 637371, Singapore.

ABSTRACT
The record of imaging resolution has kept being refreshed in the past decades and the best resolution of hyperlenses and superlenses so far is about one out of tens in terms of wavelength. In this paper, by adopting a hybrid concept of transformation optics and singular media, we report a broadband meta-lens design methodology with ultra-high resolution. The meta-lens is made of subwavelength metal/air layers, which exhibit singular medium property over a broad band. As a proof of concept, the subwavelength imaging ability is demonstrated over a broad frequency band from 1.5-10 GHz with the resolution varying from 1/117 to 1/17 wavelength experimentally.

No MeSH data available.


Related in: MedlinePlus