Dr. Sajjad Yadollahzadeh Profile

Dr. Sajjad Yadollahzadeh

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SPIE Journal Paper | 7 April 2016

Enhanced optical characteristics of terahertz bandpass filters based on plasmonic nanoparticles

Sajjad Yadollahzadeh, Hamed Baghban

JNP, Vol. 10, Issue 02, 026002, (April 2016) https://doi.org/10.1117/12.10.1117/1.JNP.10.026002

KEYWORDS: Nanoparticles, Plasmonics, Terahertz radiation, Bandpass filters, Dielectric filters, Metamaterials, Split ring resonators, Resonance enhancement, Dielectrics, Metals

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Plasmonic nanostructures enable considerable control and manipulation of light at the subwavelength scale and are promising for demonstration of optical metamaterials with enhanced spectral response. In this paper, we introduce a generation of terahertz bandpass filters that exploit the characteristics of subwavelength plasmonic nanoparticles. The design procedure is discussed based on a well-known complementary split ring resonator with a resonant feature at the THz region (∼1.5 THz), and it has been shown that device design based on plasmonic nanoparticles can conquer the poor off-resonance selectivity limit of common THz filters and exhibit higher transmission response, faster roll-off, and almost ripple-free operation. A much larger coupling capacitance for nanoparticles in the touching condition can modify the resonance wavelength, and localized hot spots enhance the device sensitivity for special applications. The effect of plasmonic nanoparticle size on the filtering characteristics is also discussed. A simple fabrication procedure based on discontinuous islandized surface morphology of thin metallic films on a dielectric has been proposed for demonstration of the THz filters introduced here.

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