scholarly journals Homogeneous Hyperbolic Systems for Terahertz and Far-Infrared Frequencies

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Leonid V. Alekseyev ◽  
Viktor A. Podolskiy ◽  
Evgenii E. Narimanov
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Hyperbolic Systems ◽  
Far Infrared ◽  
Low Loss ◽  
Naturally Occurring ◽  
Ir Frequencies ◽  
Index Systems ◽  
Infrared Frequencies

We demonstrate that homogeneous naturally-occurring materials can form hyperbolic media, and can be used for nonmagnetic negative refractive index systems. We present specific realizations of the proposed approach for the THz and far-IR frequencies. The proposed structures operate away from resonance, thereby promising the capacity for low-loss devices.

scholarly journals Low-Loss, Broadband and Tunable Negative Refractive Index Metamaterial

2010 ◽  
Vol 02 (02) ◽  
pp. 104-110 ◽  
Author(s):  
Y.J. Huang ◽  
G.J. Wen ◽  
T.Q. Li ◽  
K. Xie
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Low Loss

Rolled-up nanotechnology for the fabrication of three-dimensional fishnet-type GaAs-metal metamaterials with negative refractive index at near-infrared frequencies

2012 ◽  
Vol 100 (15) ◽  
pp. 151104 ◽  
Author(s):  
Andreas Rottler ◽  
Malte Harland ◽  
Markus Bröll ◽  
Stephan Schwaiger ◽  
Daniel Stickler ◽  
...  
Keyword(s):  
Refractive Index ◽  
Near Infrared ◽  
Negative Refractive Index ◽  
Three Dimensional ◽  
Infrared Frequencies

scholarly journals Negative refractive index metamaterial with high transmission, low reflection, and low loss in the terahertz waveband

2018 ◽  
Vol 26 (7) ◽  
pp. 8314 ◽  
Author(s):  
Takehito Suzuki ◽  
Masashi Sekiya ◽  
Tatsuya Sato ◽  
Yuki Takebayashi
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Low Loss ◽  
High Transmission

scholarly journals Negative Index Metamaterial Lens for Subwavelength Microwave Detection

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4782
Author(s):  
Srijan Datta ◽  
Saptarshi Mukherjee ◽  
Xiaodong Shi ◽  
Mahmood Haq ◽  
Yiming Deng ◽  
...  
Keyword(s):  
Refractive Index ◽  
Periodic Structures ◽  
Negative Refractive Index ◽  
Far Field ◽  
Lens Design ◽  
Theoretical Formulation ◽  
System A ◽  
Numerical Studies ◽  
Naturally Occurring

Metamaterials are engineered periodic structures designed to have unique properties not encountered in naturally occurring materials. One such unusual property of metamaterials is the ability to exhibit negative refractive index over a prescribed range of frequencies. A lens made of negative refractive index metamaterials can achieve resolution beyond the diffraction limit. This paper presents the design of a metamaterial lens and its use in far-field microwave imaging for subwavelength defect detection in nondestructive evaluation (NDE). Theoretical formulation and numerical studies of the metamaterial lens design are presented followed by experimental demonstration and characterization of metamaterial behavior. Finally, a microwave homodyne receiver-based system is used in conjunction with the metamaterial lens to develop a far-field microwave NDE sensor system. A subwavelength focal spot of size 0.82λ was obtained. The system is shown to be sensitive to a defect of size 0.17λ × 0.06λ in a Teflon sample. Consecutive positions of the defect with a separation of 0.23λ was resolvable using the proposed system.

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