Microfabrication of terahertz frequency-selective surface by short- and ultrashort laser ablation

Esakkimuthu Manikandan; Balakrishnapillai S. Sreeja; Sankararajan Radha; Muthukannan Duraiselvam; Abhishek Gupta; Shriganesh Prabhu

doi:10.1117/1.OE.58.1.011007

17 October 2018 Microfabrication of terahertz frequency-selective surface by short- and ultrashort laser ablation

Esakkimuthu Manikandan, Balakrishnapillai S. Sreeja, Sankararajan Radha, Muthukannan Duraiselvam, Abhishek Gupta, Shriganesh Prabhu

Author Affiliations +

Optical Engineering, Vol. 58, Issue 1, 011007 (October 2018). https://doi.org/10.1117/1.OE.58.1.011007

Abstract

This paper presents the method of fabricating a frequency-selective surface (FSS) filter for terahertz frequency by short- and ultrashort laser ablation process. The FSS consists of a capacitive screen made up of the copper metallic structure supported by a Teflon dielectric substrate. The dielectric properties of the Teflon substrate at terahertz frequencies were evaluated using THz-time-domain spectroscopy technique. The numerical simulation of the designed structure was performed using Computer Simulation Technology microwave studio software with unit cell configurations and the resonance was observed at 0.135 THz. The desired metallic microstructure was created in copper using an 8-ns solid-state Nd: YAG and 150 fs Ti:sapphire laser operating at the second harmonic wavelength of 532 and 800 nm, respectively. The proposed structure provides polarization-independent operation. The experimental verification of the fabricated FSS using femtosecond ablation process was done using THz-TDS technique, and it is observed that the measured data well match with the simulated result.

Citation Download Citation

Esakkimuthu Manikandan, Balakrishnapillai S. Sreeja, Sankararajan Radha, Muthukannan Duraiselvam, Abhishek Gupta, and Shriganesh Prabhu "Microfabrication of terahertz frequency-selective surface by short- and ultrashort laser ablation," Optical Engineering 58(1), 011007 (17 October 2018). https://doi.org/10.1117/1.OE.58.1.011007

Received: 5 July 2018; Accepted: 27 September 2018; Published: 17 October 2018

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