solve function, getting error

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Alice Faisal
Alice Faisal 2018-10-19
评论： Alice Faisal 2018-10-19
syms Kspp
eqn = (((e1+e2*coth(Kspp*d))/Kspp)+i(conductivity/(w*e0)))==0;%dispersion equation for Transverse Magnetic SPP waves
solx = solve(eqn,Kspp);
I want to solve this for Kspp, but I am getting an error. Can any one help?

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madhan ravi
madhan ravi 2018-10-19
编辑：madhan ravi 2018-10-19
syms Kspp
h=6.6262*10^-34; %Planck constant
ha=h/(2*pi); %Reduced Planck constant
Kb=1.3806*10^-23; % Boltzmann constant
c=3*10^8;
Ef=0.2; %Fermi energy
T=100;
e0=8.85*10^-12;
e1=4; %SiO2 dielectric
e2=4;
conductivity=sinh(ha/Kb*T)/(cosh(Ef/Kb*T)+cosh(ha/Kb*T));
eqn = (((e1+e2*coth(Kspp*d))/Kspp)+i*(conductivity/(w*e0)))==0;%dispersion equation for Transverse Magnetic SPP waves
solx = solve(eqn,Kspp) %returns empty sym which means symbolic engine is not able to solve
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Alice Faisal
Alice Faisal 2018-10-19
h=6.6262*10^-34; %Planck constant
ha=h/(2*pi); %Reduced Planck constant
Kb=1.3806*10^-23; % Boltzmann constant
c=3*10^8;
Ef=0.2; %Fermi energy
T=100;
e0=8.85*10^-12;
e1=4; %SiO2 dielectric
e2=4;
conductivity=sinh(ha/Kb*T)/(cosh(Ef/Kb*T)+cosh(ha/Kb*T));
Alice Faisal
Alice Faisal 2018-10-19
no other way to solve it? how can I solve for Kspp

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