Details

Autor(en) / Beteiligte

• Suwal, Om Krishna
• Rhie, Jiyeah
• Kim, Nayeon
• Kim, Dai-Sik

Titel

Nonresonant 10 4 Terahertz Field Enhancement with 5-nm Slits

Ist Teil von

• Scientific reports, 2017-04, Vol.7, p.45638

Ort / Verlag

England

Erscheinungsjahr

2017

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Transmission of Terahertz (THz) electromagnetic wave through a substrate is encumbered because of scattering, multiple reflections, absorption, and Fabry-Perot effects when the wave interacts with the substrate. We present the experimental realization of nonresonant electromagnetic field enhancement by a factor of almost 10 in substrate-free 5-nm gold nanoslits. Our nanoslits yielded greater than 90% normalized electric field transmission in the low-frequency THz region; the slit width was 5 nm, and the gap coverage ratio was 10 of the entire membrane, 0.42 mm . This large field enhancement was attributed to gap plasmons generated by the THz wave, which squeezes the charge cross-section, thus enabling very highly dense oscillating charges and strong THz field transmission from the nanoslits.