Table 1.

Properties of the materials used for the numerical model.

Properties	Materials
	Gold (Au)	Nickel (Ni)	SU8
Relative permittivity (${\epsilon }_r$)41	–	–	2.8
Relative permeability (${\mu }_r$)42–44	1	600	1
Electrical conductivity ($\sigma$) [S/m]45,46	4.10e + 07	1.64e + 07	–
Thermal conductivity (k) [W/k/m]47–49	314	91	0.2
Density ($\rho$) [kg/m3]50–52	19,320	8900	1200
Heat capacity ($C_p$) [kJ/K/kg]53,54	0.13	0.45	1.6
Young modulus (Y) [kN/mm2]55–57	78	207	4.02
Poisson’s ratio (P)48,54	0.42	0.31	0.22
Thermal expansion coefficient ($\alpha$) [1e − 6/K]58–60	14.1	13.3	87.1