3D Printed Alumina as a Millimeter-Wave Optical Element
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917266065457152 |
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| author | Lam, Rex Cray, Scott Dietterich, Sam Firth, Calvin Hanany, Shaul Izawa, Takumi Koch, Jürgen Konishi, Kuniaki Matsumura, Tomotake Sakurai, Haruyuki Sakurai, Yuki Takaku, Ryota Yan, Andrew |
| author_facet | Lam, Rex Cray, Scott Dietterich, Sam Firth, Calvin Hanany, Shaul Izawa, Takumi Koch, Jürgen Konishi, Kuniaki Matsumura, Tomotake Sakurai, Haruyuki Sakurai, Yuki Takaku, Ryota Yan, Andrew |
| contents | We present millimeter and sub-millimeter room temperature transmission and loss measurements of 3D printed alumina disc and of a disc with one-sided 3D printed sub-wavelength structures anti-reflection coatings (SWS-ARC). For four bands spanning 158 - 700~GHz we find an index of refraction consistent with $n= 3.107 \pm 0.007$. The loss over the entire frequency band between 158~GHz and 700~GHz spans $ 1 \cdot 10^{-3} \leq \tan δ\leq 2.49 \cdot 10^{-3}$ with 10%-30% uncertainty at the lower range of frequencies shrinking to $\sim\!2\%$ at the higher frequencies. As expected, constructive and destructive interference fringes that are apparent with the flat disc data are absent with the disc that has SWS-ARC. The measured data are consistent with finite element analysis predictions that are based on the measured shape of the SWS. At frequencies between 158~GHz and 200~GHz, below the onset of diffraction effects, reflectance is reduced from a maximum of 64% to about 25%, closely matching predictions. These measurements of the index, loss, and SWS-ARC of 3D printed alumina suggest that the material and fabrication technique could be useful for astrophysical applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_00304 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | 3D Printed Alumina as a Millimeter-Wave Optical Element Lam, Rex Cray, Scott Dietterich, Sam Firth, Calvin Hanany, Shaul Izawa, Takumi Koch, Jürgen Konishi, Kuniaki Matsumura, Tomotake Sakurai, Haruyuki Sakurai, Yuki Takaku, Ryota Yan, Andrew Instrumentation and Methods for Astrophysics We present millimeter and sub-millimeter room temperature transmission and loss measurements of 3D printed alumina disc and of a disc with one-sided 3D printed sub-wavelength structures anti-reflection coatings (SWS-ARC). For four bands spanning 158 - 700~GHz we find an index of refraction consistent with $n= 3.107 \pm 0.007$. The loss over the entire frequency band between 158~GHz and 700~GHz spans $ 1 \cdot 10^{-3} \leq \tan δ\leq 2.49 \cdot 10^{-3}$ with 10%-30% uncertainty at the lower range of frequencies shrinking to $\sim\!2\%$ at the higher frequencies. As expected, constructive and destructive interference fringes that are apparent with the flat disc data are absent with the disc that has SWS-ARC. The measured data are consistent with finite element analysis predictions that are based on the measured shape of the SWS. At frequencies between 158~GHz and 200~GHz, below the onset of diffraction effects, reflectance is reduced from a maximum of 64% to about 25%, closely matching predictions. These measurements of the index, loss, and SWS-ARC of 3D printed alumina suggest that the material and fabrication technique could be useful for astrophysical applications. |
| title | 3D Printed Alumina as a Millimeter-Wave Optical Element |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2602.00304 |