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How to include Negative permitivity values of materials in HFSS ??

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kela3kela

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I am trying to simulate an optical antenna in HFSS . How can I define following material properties according Drude model in hfss.

ε=1-[(ωp)^2/(ω(ω+iγ))]

where for gold, ωp=1.37*10^16,γ=4.05*10^13,unit 1/s. when Freq wω=0.11Thz, ε=-114423*10^6+(2.32*10^7)i

When I edit Relative Permittivity=-114423, Dielectric Loss Tangent=(2.32*10^7)/(114423*10^6), the simulation completed with execution error on server.

Any solution to this negative permitivity problem in HFSS??
 

Secondly how can I simulate THz antenna in HFSS?? Im getting following error :
"HFSS error: Failure in solving reduced matrix"
 

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