Fitting Drude-Lindhard parameters for Ge
i ai ωpi γi

1

3.7870E-04

0.437

4.705

2

-6.6100E-03

2.507

2.175

3

6.3900E-03

2.818

1.321

4

1.3216E-01

3.898

4.430

5

-6.1400E-03

4.558

3.985

6

6.5000E-03

5.231

1.439

7

-2.4656E+00

9.079

16.067

8

2.3590E-02

10.111

2.582

9

1.0950E-02

17.037

4.505

10

3.1793E+00

17.911

45.282

11

-1.1500E-02

21.017

3.862

12

3.7900E-03

25.536

2.954

13

-2.7200E-03

28.639

1.616

14

-4.6263E-01

30.468

16.394

15

2.2084E-01

31.227

11.631

16

-3.3580E-02

50.242

30.306

17

3.8210E-02

148.646

225.824

18

-1.0500E-03

184.329

45.933

19

-1.7913E-04

216.288

78.705

20

-2.8294E-05

403.501

45.790

21

1.0700E-03

437.024

480.055



References of fitted experimental data for Ge

Incident photon
energy range (eV)

Fitted optical
constants

Source of data

0.002-0.018

n, k

C. Randall and R. Rawcliffe, Appl. Opt. 6, 1889 (1967)

0.018-1

n

N. Barnes and M. Piltch, J. Opt. Soc. Am. 69, 178 (1979)

0.018-1

k

R. Collins and H. Fan, Phys. Rev. 93, 674 (1954)
D. Stierwalt and R. Potter, Rep. Int. Conf. Phys. Semicond., Exter, London, p.513 (1962)
W. Dash and R. Newman, Phys. Rev. 99, 1151 (1955)

1-6

n, k

D. Aspnes and A. Studna, Phys. Rev. B 27, 985 (1983)

6-10

n, k

H. Philipp and E. Taft, Phys. Rev. 113, 1002 (1959)

20-185

n

Interpolation

20-185

k

M. Cardona et al. Proc. Int. Conf. Phys. Semicond. Cambridge, p. 208 (1970)

185-525

n, k

A. Lukirskii et al. Opt. Spectrosc. 16, 168 (1964)