I calculated IQEs using the measured EQEs and reflectivities and the following formula:

,

where R is the reflectivity of the PD, and T is the transmittance of the PD.

Here T is assumed to be zero and the scattering loss is ignored as you said.

The obtained IQEs are shown in Fig. 1.

Also the EQE, IQE, and reflectivity at a few angles near the angle where the EQE goes maximum for the P pol were measured as shown in Fig. 2 and Fig. 3.

The angle where the EQE goes maximum for the P pol is -51 deg.

So far, in these plots, the systematic errors because of the power meter are not considered.

And I replaced the figures with the figures having larger fonts.

QE_Ref_P.txt QE_Ref_S.txt

AroundPeak.txt

# angle(deg) 3beams(mW) error DCout(V) error
# incident power is 11.7 +/- 0.2 mW
-80.    4.6     0.1     0.14    0.02
-75.    3.52    0.02    1.02    0.02
-70.    1.24    0.02    1.58    0.02
-60.    0.627   0.002   2.04    0.02
-50.    0.244   0.002   2.12    0.02
-40.    0.410   0.002   2.10    0.02
-30.    0.512   0.002   2.04    0.02
-20.    0.851   0.002   1.98    0.02

# angle(deg) 3beams(mW) error DCout(V) error
# incident power is 11.7 +/- 0.2 mW
-80.   6.61     0.03    0.04    0.02
-75.   6.17     0.03    0.52    0.02
-70.   5.29     0.02    0.98    0.02
-60.   3.40     0.02    1.42    0.02
-50.   1.85     0.02    1.70    0.02
-40.   1.78     0.02    1.84    0.02
-30.   1.372    0.004   1.90    0.02
-20.   1.293    0.004   1.92    0.02

angle(deg) inc.pow.(mW,P) error Ref(mW,P) error DCout(V,P) error inc.pow.(mW,S) error Ref(mW,S) error DCout(V,S) error
-47 11.64 0.03 0.173 0.003 2.02 0.01 11.54 0.03 1.92 0.03 1.70 0.01
-49 11.46 0.02 0.375 0.004 1.99 0.01 11.60 0.03 2.12 0.04 1.66 0.01
-51 11.67 0.03 0.282 0.003 2.04 0.01 11.61 0.03 2.36 0.03 1.64 0.01
-53 11.56 0.02 0.325 0.003 2.00 0.01 11.35 0.03 2.59 0.04 1.56 0.01
-55 11.62 0.02 0.518 0.003 1.97 0.01 11.53 0.02 2.86 0.04 1.51 0.02