λ/4 Retarder Film Measurement from: Polarization of foliar reflectance – novel host plant cue for insect herbivores

λ/4 retarder film measurements, description Description of methods used to measure the wavelength-specific effects of the λ/4 retarder film (#88-253, Edmund Optics) on degree of linear polarization (DoLP) and axis of polarization (AoP). Includes figures, created with the R code in QWP_Retarder_Film_Measurement_R_code.R, showing the effect of rotation of λ/4 retarder film on the AoP and DoLP across different wavelengths of light. QWP_Retarder_Film_Measurement_description.pdf λ/4 retarder film measurements, raw data 136 transmission measurements taken through a λ/4 retarder film sandwiched between two polarizers. The measurements were taken at different rotations of the λ/4 retarder film (97°, 93°, 91°, 90°, 89°, 85°, 81°, 77°, 73°, 69°, 65°, 61°, 57°, 53°, 49°, 46°, 45°, 44°, 43°, 41°, 39°, 35°, 31°, 27°, 23°, 19°, 15°, 11°, 7°, 3°, 1°, 0°, -1°, -5°), and different angles between the axes of the two polarizers (0°, 45°, 90°, 135°). QWP_Retarder_Film_Measurement_data.csv λ/4 retarder film measurements, R code The R code necessary to calculate the wavelength-specific effects of different rotations of the λ/4 retarder film on the AoP and DoLP, using the raw data contained in QWP_Retarder_Film_Measurement_data.csv. This code can also generate Figs. S5-7 in QWP_Retarder_Film_Measurement_description.pdf. QWP_Retarder_Film_Measurement_R_code.R