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Flat Low-Loss Silicon Gradient Index Lens for Millimeter and Submillimeter Wavelengths

Defrance, F. and Jung-Kubiak, C. and Rahiminejad, S. and Macioce, T. and Sayers, J. and Connors, J. and Radford, S. J. E. and Chattopadhyay, G. and Golwala, S. R. (2020) Flat Low-Loss Silicon Gradient Index Lens for Millimeter and Submillimeter Wavelengths. Journal of Low Temperature Physics, 199 (1-2). pp. 376-383. ISSN 0022-2291. doi:10.1007/s10909-019-02255-x.

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We present the design, simulation, and planned fabrication process of a flat high resistivity silicon gradient index (GRIN) lens for millimeter and submillimeter wavelengths with very low absorption losses. The gradient index is created by sub wavelength holes whose size increases with the radius of the lens. The effective refractive index created by the subwavelength holes is constant over a very wide bandwidth, allowing the fabrication of achromatic lenses up to submillimeter wavelengths. The designed GRIN lens was successfully simulated and shows an expected efficiency better than that of a classic silicon plano-concave spherical lens with approximately the same thickness and focal length. Deep reactive ion etching (DRIE) and wafer-bonding of several patterned wafers will be used to realize our first GRIN lens prototype.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access Paper
Defrance, F.0000-0002-3746-5296
Jung-Kubiak, C.0000-0003-2745-6342
Rahiminejad, S.0000-0001-8094-7189
Macioce, T.0000-0002-3156-6627
Sayers, J.0000-0002-8213-3784
Connors, J.0000-0002-6094-2943
Radford, S. J. E.0000-0001-9113-1660
Chattopadhyay, G.0000-0001-7942-5025
Golwala, S. R.0000-0002-1098-7174
Additional Information:© 2019 Springer Science+Business Media, LLC, part of Springer Nature. First Online: 14 November 2019. This work was funded by NASA (Grant NNX15AE01G). The Caltech/JPL President’s and Director’s Research Fund proposal was recently successful and will allow us to continue this work. SBIR and APRA proposals are currently under review.
Group:Astronomy Department
Funding AgencyGrant Number
JPL President and Director's FundUNSPECIFIED
Subject Keywords:Lens; Gradient index; Silicon; GRIN; Subwavelength; DRIE; THz
Issue or Number:1-2
Record Number:CaltechAUTHORS:20191114-154630277
Persistent URL:
Official Citation:Defrance, F., Jung-Kubiak, C., Rahiminejad, S. et al. Flat Low-Loss Silicon Gradient Index Lens for Millimeter and Submillimeter Wavelengths. J Low Temp Phys 199, 376–383 (2020).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99853
Deposited By: Tony Diaz
Deposited On:15 Nov 2019 02:58
Last Modified:16 Nov 2021 17:49

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