| Original Articles |
|
|
|
|
Impacts of Refraction Index Mismatch on Performance of Target Detection and Imaging by Using Flat LHM Lens |
| FANG Jie-Ran1;GONG Yu1;DONG Xiao-Ting1,2;WANG Gang1 |
| 1Department of Telecommunication Engineering, Jiangsu University, Zhenjiang 2120132Laboratory of Computational Electromagnetics, Darmstadt University of Technology, D-64289 Darmstadt, Germany |
|
| Cite this article: |
|
FANG Jie-Ran, GONG Yu, DONG Xiao-Ting et al 2008 Chin. Phys. Lett. 25 286-289 |
|
|
|
|
Abstract Refraction index mismatch between flat left-handed metamaterial (LHM) lens and its surrounding medium generally destroys the focusing of flat LHM lens and degrades the performance of near-field target detection by using flat LHM lens. For LHM lens of refraction index mismatch within ±30%, numerical simulations demonstrate that lenses with large refraction index may suffer less resolution degradation than lenses with small refraction index, and the enhancement of refocused microwave backscattered from target can be subsided by up to approximately 5.5dB. The refraction index mismatch will also shift the target position in the reconstructed image so that theoretical prediction of target position needs to be modified.
|
| Keywords:
78.20.Ci
42.30.-d
42.30.Wb
|
|
|
Received: 17 September 2007
Published: 27 December 2007
|
|
| PACS: |
78.20.Ci
|
(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
|
| |
42.30.-d
|
(Imaging and optical processing)
|
| |
42.30.Wb
|
(Image reconstruction; tomography)
|
|
|
|
|
|
[1] Veselago V G 1968 Sov. Phys. Usp. 10 509
[2] Smith D R, Pendry J B and Wiltshire M C K 2004 Science 305 788
[3] Caloz C and Itoh T 2005 Proc. IEEE 93 1744
[4] Engheta N and Ziolkowski R W 2005 IEEE Trans. MicrowaveTheor. Technol. 53 1535
[5] Pendry J B 2000 Phys. Rev. Lett. 85 3966
[6] Shen J T and Platzman P M 2002 Appl. Phys. Lett. 80 3286
[7] Cummer S A 2003 Appl. Phys. Lett. 82 1503
[8] Rao X S and Ong C K 2003 Phys. Rev. E 68 0676011
[9] Feise M W and Kivshar Y S 2005 Phys. Lett. A 334 326
[10] Lagarkov A N and Kissel V N 2004 Phys. Rev. Lett. 92774011
[11] Grbic A and Eleftheriades G V 2004 Phys. Rev. Lett. 921174031
[12] Aydin A, Bulu I and Ozbay E 2005 Opt. Express 13 8753
[13] Grbic A and Eleftheriades G V 2005 IEEE Trans. AntennasPropagat. 53 3201
[14] Wang G, Fang J and Dong X T 2008 IEEE Trans.Antennas Propagat. 55 3534
[15] Wang G, Fang J and Dong X T 2007 Opt. Express 15 3312
[16] Aydin K and Ozbay E 2006 J. Opt. Soc. Am. B 23 415
[17] Dong X T, Rao X S, Gan Y B, Guo B and Yin W Y 2004 IEEEMicrowave Wireless Compon. Lett. 14 301 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
