Subwavelength imaging with materials of in-principle arbitrarily low index contrast

Gui, Yang; Sahebdivan, Sahar; Ong, C. K.; Tyc, Tomáš; Leónhardt, Ulf

doi:10.1088/1367-2630/14/2/025001

Cited by 21 publications

(16 citation statements)

References 30 publications

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“…In real application, the silicon composite core can be replaced by the real detector. The structure of the electromagnetic field attractor is similar to our previous work on omnidirectional retroreflectors [5] and Maxwell fish eye lenses for perfect imaging [13,14].…”

Section: Resultssupporting

confidence: 62%

Electromagnetic field attractor made of gradient index metamaterials

et al. 2012

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We present a device that is designed with varying permittivity ε(r) such that an electromagnetic wave in the K-band of the microwave regime entering it will bend inward towards the core. The core is made of silicon composites. We follow the distribution formula of the permittivity for the device derived by Narimanov and Kildishev using the optical-mechanical analogy. The diameter of the device is 14 cm, and it is constructed out of 21 rings of two different types of etched printed circuit boards, as well as dielectric powders as adding filling materials. The experimental wave intensity profile, based on parallel plate measurements for the cases where the incident plane wave is slightly displaced to the top of the center of the device and the case of on center incidence, are presented and discussed. In spite of some mismatch of the core and metamaterial structures of the device found, approximately 80% of the wave still manages to reach the core of the device and gets trapped and absorbed. Broadband properties of the device are also investigated.

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Section: Resultssupporting

confidence: 62%

Electromagnetic field attractor made of gradient index metamaterials

et al. 2012

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“…Moreover, we offer a comparison with respect to the Miñano lens [26,27], which has also been shown to exhibit perfect imaging in the limit of geometrical optics and has a similar form to the Maxwell fish eye lens. Both the drain and the source are modeled here as a coaxial cable with the inner conductor exposed, in agreement with previous experiments [28,29].…”

Section: Introductionsupporting

confidence: 53%

“…[25], and this drain was coined a "perfect drain." However, due to the difficulty of practical implementation of these two types of drains, simple coaxial cables were employed for carrying out the first experiments [28,29]. This type of drain was named a "passive drain" [28] and it satisfies the matching condition but not the active element or the pointlike nature.…”

Section: Passive Drain Implementationmentioning

confidence: 99%

“…There has been proposal for a perfect, nonpoint drain which is of the form of an inhomogeneous absorptive region near the image point [25]. This is incredibly difficult to implement, and for this reason it is the much simpler coaxial used in previous works [28,29] that is implemented here. This type of drain necessarily has finite dimensions, but it is interesting to investigate whether reducing the size will influence the frequency response of the device.…”

Section: B Nonpoint Drains and Frequency Dependencementioning

confidence: 99%

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Frequency dependence and passive drains in fish-eye lenses

2012

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The Maxwell fish eye lens has previously been reported as being capable of the much sought after phenomenon of subwavelength imaging. The inclusion of a drain in this system is considered crucial to the imaging ability, although its role is the topic of much debate. This paper provides a numerical investigation into a practical implementation of a drain in such systems, and analyzes the strong frequency dependence of both the Maxwell fish eye lens and an alternative, the Miñano lens. The imaging capability of these types of lens is questioned, and it is supported by simulations involving various configurations of drain arrays. Finally, a discussion of the near-field and evanescent wave contribution is given.

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“…This drawback, known as the "Abbé limit, has long been the foremost barrier to high-resolution imaging, until the early 2000s when Pendry [1] showed that an optical lens with a negative index can restore the evanescent waves issued from the source allowing then for the subdiffraction imaging and for a resolution better than half the wavelength at the focus. From then on, several devices based on this principle, including superlensing photonic crystals [2], optical superlenses [3], hyperlenses [4,5], metalenses [6][7][8][9], and Maxwell fish eyes [10,11], have been proposed. These artificial devices either restore the evanescent waves [1][2][3], or convert them to propagative waves owing to a subwavelength grating inserted in between the object and the objective of a regular optical microscope [4][5][6].…”

mentioning

confidence: 99%