Title :
2-Dimensional mapping of frequency response of a single THz split-ring resonator probed by high speed asynchronous optical sampling
Author :
Thoma, A. ; Beck, M. ; Qiao, W. ; Klatt, G. ; Gebs, R. ; Bartels, A. ; Nagel, Michael ; Dekorsy, T.
Author_Institution :
Dept. of Phys., Univ. of Konstanz, Konstanz, Germany
Abstract :
We investigate asymmetric split ring resonators (SRR) for the THz frequency range. These SRRs exhibit sharp resonances and strong field localization, which is of potential interest e.g. for biosensing of minute amount of sample material. Our near-field measurements show the local response of the SRRs on a scale much smaller than the resonance wavelength of 320 mum. Fig. 1 depicts the spatially resolved frequency response of an SRR at 1 THz and 1.4 THz, respectively. At around 1 THz an increase in the amplitude is observed when the tip is above the gaps of the SRR, whereas at 1.4 THz the amplitude pattern is more complex and shows maxima for the tip being further away from the SRR. We compare these experimentally determined frequency distributions to numerical calculations and discuss the influence of coupling between adjacent SSRs.
Keywords :
biosensors; frequency response; high-speed optical techniques; near-field scanning optical microscopy; optical resonators; 2D mapping; THz split-ring resonator; asymmetric split ring resonators; biosensing; frequency distributions; frequency response; high speed asynchronous optical sampling; near-field measurements; wavelength 320 mum; Biological materials; Biomedical optical imaging; Biosensors; Frequency response; High speed optical techniques; Optical materials; Optical resonators; Optical ring resonators; Resonance; Sampling methods;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5192069
