Carpet anti-cloak based on transformation optics

Li, Xuan; Zhang, Luoning; Shi, Jianzhong; Wang, Zhaona; Liu, Dahe

doi:10.3788/col201412.121601

中国光学快报

2014

DOI: 10.3788/col201412.121601

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Carpet anti-cloak based on transformation optics

Xuan Li¹,

Luoning Zhang²,

Jianzhong Shi³

et al.

Abstract: We propose a scheme for carpet anti-cloak based on the transformation optics. An anti-cloak layer is designed, which can make the external electromagnetic waves break the carpet cloak shielding. The external electromagnetic waves can be detected under the carpet cloak, while not affecting the role of carpet cloak of stealth. The Jacobian transformation tensor is calculated by numerically solving the Laplace equations with proper boundary condition. Thus, it is possible to design the anti-cloak layer of irregul… Show more

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Cited by 3 publications

(1 citation statement)

References 28 publications

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“…In 2014, Lu designed a diode-end pumped, conductively cooled intra-cavity frequency-doubled Nd:YLF laser to achieve green pulse energy of 16.8 mJ at 523 nm [19] . Also in 2014, Liu reported an acousto-optic (AO) switched diode-side-pumped 1314 nm Nd:YLF laser with the highest pulse energy of 3.8 mJ at a repetition rate of 1 kHz [20] . Despite these advances, however, high-energy diode-pumped Nd:YLF 1053 nm lasers are rarely reported.…”

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confidence: 99%

Diode-pumped Nd:YLF slab master oscillator power amplifier laser system with 655 mJ output at 50 Hz repetition rate

Yang¹,

Zhu²,

Ma³

et al. 2015

中国光学快报

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A laser-diode-pumped high-pulse-energy Nd:LiYF 4 master oscillator power amplifier 1053 nm laser system is demonstrated. We design a home-made pump module to homogenize the pump intensity through the ray tracing method. To increase the extraction efficiency, the pre-amplifier adopts a double-pass amplification structure. At a repetition rate of 50 Hz, 655 mJ pulse energy and 12.9 ns pulse width of 1053 nm laser is obtained from the master oscillator power amplifier system. The corresponding peak power is 51 MW. The optical-to-optical efficiency of the system is about 9.7%.

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mentioning

confidence: 99%

Diode-pumped Nd:YLF slab master oscillator power amplifier laser system with 655 mJ output at 50 Hz repetition rate

Yang¹,

Zhu²,

Ma³

et al. 2015

中国光学快报

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Broadband unidirectional acoustic cloak based on phase gradient metasurfaces with two flat acoustic lenses

Wang

Wan

Chen

et al. 2016

Journal of Applied Physics

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Narrow bandwidth and bulky configuration are the main obstacles for the realization and application of invisible cloaks. In this paper, we present an effective method to achieve broadband and thin acoustic cloak by using an acoustic metasurface (AMS). In order to realize this cloak, we use slitted unit cells to design the AMS due to the advantage of less energy loss, broad operation bandwidth, and subwavelength thickness. According to the hyperboloidal phase profile along the AMS, the incident plane waves can be focused at a designed focal spot by the flat lens. Furthermore, broadband acoustic cloak is obtained by combining two identical flat lenses. The incident plane waves are focused at the center point in between of the two lenses by passing through one lens, and then recovered by passing through the other one. However, they cannot reach the cloaked regions in between of the two lenses. The simulation results can verify the non-detectability effect of the acoustic cloak. Our study results provide an available and simple approach to experimentally achieve the acoustic cloak, which can be used in acoustic non-detectability for large objects.

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New devices for unidirectional acoustic cloaking for large objects in infinite frequency bandwidth

Wang

Han

Wan

et al. 2018

Int. J. Mod. Phys. B

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For years, researchers struggled to realize the acoustic invisibility cloaks with simple for large objects in broadband. In this paper, a new-type unidirectional acoustic cloak is proposed and designed by using eight especial triangles region filled with a certain refractive index inert gas. The acoustic wave can be manipulated to pass through the model but “by-pass” the cloaked region according to the traditional Snell’s law. The incident plane waves will remain without any change. Therefore, the cloaked region cannot be detected. Our designed cloak can realize the infinite length of the invisibility region along the propagation direction and offer good cloaking effect in any frequency range. The simulation results agree well with the theoretical predictions and verify the nondetectability effect of the unidirectional acoustic cloak. Our mechanism may be useful for further actual applications in hiding large objects acoustically.

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Carpet anti-cloak based on transformation optics

Cited by 3 publications

References 28 publications

Diode-pumped Nd:YLF slab master oscillator power amplifier laser system with 655 mJ output at 50 Hz repetition rate

Diode-pumped Nd:YLF slab master oscillator power amplifier laser system with 655 mJ output at 50 Hz repetition rate

Broadband unidirectional acoustic cloak based on phase gradient metasurfaces with two flat acoustic lenses

New devices for unidirectional acoustic cloaking for large objects in infinite frequency bandwidth

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