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Giant electric field enhancement in split ring resonators featuring nanometer-sized gaps.

Bagiante S, Enderli F, Fabiańska J, Sigg H, Feurer T - Sci Rep (2015)

Bottom Line: Today's pulsed THz sources enable us to excite, probe, and coherently control the vibrational or rotational dynamics of organic and inorganic materials on ultrafast time scales.Here, we demonstrate resonant electric field enhancement structures, which concentrate the incident electric field in sub-diffraction size volumes and show an electric field enhancement as high as ~14,000 at 50 GHz.These values have been confirmed through a combination of near-field imaging experiments and electromagnetic simulations.

View Article: PubMed Central - PubMed

Affiliation: 1] Laboratory of Micro- and Nanotechnology Paul Scherrer Institute, Villigen 5232, Switzerland [2] Institute of Applied Physics University of Bern, Bern 3012, Sidlerstrasse 5, Switzerland.

ABSTRACT
Today's pulsed THz sources enable us to excite, probe, and coherently control the vibrational or rotational dynamics of organic and inorganic materials on ultrafast time scales. Driven by standard laser sources THz electric field strengths of up to several MVm(-1) have been reported and in order to reach even higher electric field strengths the use of dedicated electric field enhancement structures has been proposed. Here, we demonstrate resonant electric field enhancement structures, which concentrate the incident electric field in sub-diffraction size volumes and show an electric field enhancement as high as ~14,000 at 50 GHz. These values have been confirmed through a combination of near-field imaging experiments and electromagnetic simulations.

No MeSH data available.


Intensity graphs of the measured a) and the simulated b) out-of-plane electric field distribution /Ez(x,y,ν3)/ at the third resonance.
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f3: Intensity graphs of the measured a) and the simulated b) out-of-plane electric field distribution /Ez(x,y,ν3)/ at the third resonance.

Mentions: From the calibrated temporal electric field distribution Ez(x,y,t) we calculate the spectral electric field distribution Ez(x,y,ν) by Fourier transforming the time dependent electric field at every position (x,y). The intensity graph in Fig. 3a) shows the measured electric field distribution /Ez(x,y,ν3)/ at the third resonance, i.e. at ν3 = 180 GHz. The signal at the first resonance is close to the noise floor and not considered here.


Giant electric field enhancement in split ring resonators featuring nanometer-sized gaps.

Bagiante S, Enderli F, Fabiańska J, Sigg H, Feurer T - Sci Rep (2015)

Intensity graphs of the measured a) and the simulated b) out-of-plane electric field distribution /Ez(x,y,ν3)/ at the third resonance.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4306966&req=5

f3: Intensity graphs of the measured a) and the simulated b) out-of-plane electric field distribution /Ez(x,y,ν3)/ at the third resonance.
Mentions: From the calibrated temporal electric field distribution Ez(x,y,t) we calculate the spectral electric field distribution Ez(x,y,ν) by Fourier transforming the time dependent electric field at every position (x,y). The intensity graph in Fig. 3a) shows the measured electric field distribution /Ez(x,y,ν3)/ at the third resonance, i.e. at ν3 = 180 GHz. The signal at the first resonance is close to the noise floor and not considered here.

Bottom Line: Today's pulsed THz sources enable us to excite, probe, and coherently control the vibrational or rotational dynamics of organic and inorganic materials on ultrafast time scales.Here, we demonstrate resonant electric field enhancement structures, which concentrate the incident electric field in sub-diffraction size volumes and show an electric field enhancement as high as ~14,000 at 50 GHz.These values have been confirmed through a combination of near-field imaging experiments and electromagnetic simulations.

View Article: PubMed Central - PubMed

Affiliation: 1] Laboratory of Micro- and Nanotechnology Paul Scherrer Institute, Villigen 5232, Switzerland [2] Institute of Applied Physics University of Bern, Bern 3012, Sidlerstrasse 5, Switzerland.

ABSTRACT
Today's pulsed THz sources enable us to excite, probe, and coherently control the vibrational or rotational dynamics of organic and inorganic materials on ultrafast time scales. Driven by standard laser sources THz electric field strengths of up to several MVm(-1) have been reported and in order to reach even higher electric field strengths the use of dedicated electric field enhancement structures has been proposed. Here, we demonstrate resonant electric field enhancement structures, which concentrate the incident electric field in sub-diffraction size volumes and show an electric field enhancement as high as ~14,000 at 50 GHz. These values have been confirmed through a combination of near-field imaging experiments and electromagnetic simulations.

No MeSH data available.