Effects of anisotropy on absorption cross-section spectra of medium-sized spheroidal corundum particles

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Volume 646 (February 2021)

A&A, 646 (2021) A87

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Table 1

Modeling the FDTD spectra of the anisotropic material with spectra of hypothetical isotropic materials.

Setup	Prolate particles	Setup	Oblate particles
1_1p	C_abs = cos²(α)⋅C_{ab, short}+sin²(α)⋅C_{c, short}	1_1o	C_abs = cos²(α)⋅C_{ab, long}+sin²(α)⋅C_{c, long}

1_2p	C_abs = cos²(α)⋅C_{ab, short}+sin²(α)⋅C_{c, long}	1_2o	C_abs = cos²(α)⋅C_{ab, long}+sin²(α)⋅C_{c, short}

1_3p	C_abs = cos²(α)⋅C_{ab, long}+sin²(α)⋅C_{c, short}	1_3o	C_abs = cos²(α)⋅C_{ab, short}+sin²(α)⋅C_{c, long}

2_1p	Prolate of isotropic material with dielectric function of a–b-plane, incident along long axis of prolate, polarized along short axis.	2_1o	Oblate of isotropic material with dielectric function of a–b-plane, incident along short axis of oblate, polarized along long axis.

2_2p	Prolate of isotropic material with dielectric function of a–b-plane, incident and polarized along short axis of prolate.	2_2o	Oblate of isotropic material with dielectric function of a–b-plane, incident and polarized along long axis of oblate.

2_3p	Prolate of isotropic material with dielectric function of a–b-plane, incident along Y, polarization angles 0°, 30°, 60°, 90°, starting from Z-axis	2_3o	Oblate of isotropic material with dielectric function of a–b-plane, incident along Y, polarization angles 0°, 30°, 60°, 90°, starting from Z-axis

3_1p	C_abs = sin²(θ)⋅C_{ab, short}+cos²(θ)⋅C_{c, short}	3_1o	C_abs = sin²(θ)⋅C_{ab, long}+cos²(θ)⋅C_{c, long}

3_2p	C_abs = sin²(θ)⋅C_{ab, long}+cos²(θ)⋅C_{c, long}	3_2o	C_abs = sin²(θ)⋅C_{ab, short}+cos²(θ)⋅C_{c, short}

3_3p	C_abs = sin²(θ)⋅C_{ab, short}+cos²(θ)⋅C_{c, short}	3_3o	C_abs = sin²(θ)⋅C_{ab, long}+cos²(θ)⋅C_{c, long}

Notes. There is the dielectric function of the c-axis (index c), the other has the dielectric function of the a–b-plane (index ab). The indices short, long describe the polarization direction of the incident light parallel to the short or long axis of the particle.

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