The continuous refractive beamforming surface for far-field with robustness and high efficiency

Toshifumi Yasui; Hiroyuki Tahara; Yusuke Kono; Kohei Yamamoto; Tetsuaki Iwane; Yoshiki Kashihara; Masanobu Inada

doi:10.1117/12.2627743

3 October 2022 The continuous refractive beamforming surface for far-field with robustness and high efficiency

Toshifumi Yasui, Hiroyuki Tahara, Yusuke Kono, Kohei Yamamoto, Tetsuaki Iwane, Yoshiki Kashihara, Masanobu Inada

Proceedings Volume 12218, Laser Beam Shaping XXII; 1221804 (2022) https://doi.org/10.1117/12.2627743
Event: SPIE Optical Engineering + Applications, 2022, San Diego, California, United States

Abstract

We propose a continuous refractive beamforming surface for far-field with a freeform surface and non-one-to-one ray mapping, realizing the high efficiency and robustness of the XY position. We developed a new iterative optimization algorithm. The major tasks in each optimization step are updating the ray emission angles and surface reconstruction. The update of the ray emission angles is performed by the Monge-Ampère equation considering target and tentative far-field intensity distributions. The surface reconstruction is realized by minimizing the loss function consisting of the reconstruction error and regularization terms concerning the surface’s height and curvature. We also developed a manufacturing process for the freeform surface, which was very close to the design, by providing manufacturing feedback. This manufacturing process consists of the mastering process by a laser grayscale lithography, mold manufacturing process by a Ni electroforming, and producing element process by an imprinting process.

Conference Presentation

Citation Download Citation

Toshifumi Yasui, Hiroyuki Tahara, Yusuke Kono, Kohei Yamamoto, Tetsuaki Iwane, Yoshiki Kashihara, and Masanobu Inada "The continuous refractive beamforming surface for far-field with robustness and high efficiency", Proc. SPIE 12218, Laser Beam Shaping XXII, 1221804 (3 October 2022); https://doi.org/10.1117/12.2627743

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