Title :
Subwavelength hole arrayed stack: Towards terahertz high resolution imaging systems
Author :
Croënne, Charles ; Garet, Frédéric ; Carbonell, Jorge ; Lheurette, Eric ; Blary, Karine ; Coutaz, Jean-Louis ; Lippens, Didier
Author_Institution :
Inst. d´´Electron. de Microelectron. et Nanotechnol., Univ. des Sci. et Technol. de Lille, Villeneuve-d´´Ascq, France
fDate :
Sept. 29 2009-Oct. 1 2009
Abstract :
We report on the electromagnetic response of a stack of sub-wavelength hole metal arrays. The samples were designed for exhibiting left-handed dispersion branches under normal incidence and their transmissivity were optimized via the fabrication of elliptic-shaped holes. An experimental evidence of ground left handed dispersion branches was found around 0.45 THz by time-domain terahertz spectroscopy, supported by full wave simulations. The insertion losses are 3 dB for a five-layer structure, this good level being explained by successful impedance matching. This result paves the way of high transmissivity high resolution focusing devices.
Keywords :
impedance matching; metamaterials; refractive index; terahertz spectroscopy; terahertz wave imaging; elliptic-shaped hole fabrication; five-layer structure; full wave simulations; impedance matching; insertion loss; left-handed dispersion branches; loss 3 dB; metamaterials; negative refractive index; subwavelength hole arrayed stack; terahertz high resolution imaging systems; time-domain terahertz spectroscopy; transmissivity high resolution focusing devices; Frequency; High-resolution imaging; Impedance matching; Lighting; Metamaterials; Microwave technology; Optical imaging; Permittivity; Plasmons; Shape; Terahertz; focusing devices; metamaterials; subwavelength hole array;
Conference_Titel :
Microwave Conference, 2009. EuMC 2009. European
Conference_Location :
Rome
Print_ISBN :
978-1-4244-4748-0
