Ultrafast Relaxation of Charge Carriers Induced Switching in Terahertz Metamaterials

Rao, S. Jagan Mohan; Kumar, Gagan; Azad, Abul Kalam; Chowdhury, Dibakar Roy

doi:10.1007/s10762-018-0547-6

Title: Ultrafast Relaxation of Charge Carriers Induced Switching in Terahertz Metamaterials

Journal Article · Tue Oct 16 00:00:00 EDT 2018 · Journal of Infrared, Millimeter, and Terahertz Waves

DOI:https://doi.org/10.1007/s10762-018-0547-6· OSTI ID:1482017

Rao, S. Jagan Mohan ^[1]; Kumar, Gagan ^[1];

^[2]; Chowdhury, Dibakar Roy ^[3]

Indian Institute of Technology, Guwahati (India)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Mahindra Ecole Centrale, Hyderabad (India)

Here, we demonstrate ultrafast switching of resonant mode in terahertz metamaterials through optical excitation of radiation-damaged silicon placed in the gap of a split-ring resonator. Upon optical excitation, we observe the dynamic transition of the fundamental resonance from ON-to-OFF state on a timescale of 4 picoseconds (ps) and then fast recovery of the resonance to the ON-state within the next 20 ps. Electric field distributions in the metamaterial unit cell derived through numerical simulations clearly support our experimental observations, showing that the high electric field at the resonator gaps, responsible for inductive-capacitive (LC) resonance, completely disappears and switches OFF the resonance after being optically excited. The ultrafast switching of the metamaterial resonance is attributed to the relaxation of the photo-carriers through the defect states of radiation-damaged silicon layer. Such ultrafast material–based active control of metamaterials can lead to the ultrafast terahertz metaphotonic devices.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1482017

Report Number(s):: LA-UR-18-30111

Journal Information:: Journal of Infrared, Millimeter, and Terahertz Waves, Vol. 39, Issue 12; ISSN 1866-6892

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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