A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials

Xiaoqing Luo; Zhiyong Tan; Chang Wang; Juncheng Cao

doi:10.3788/COL201917.093101

Journals >Chinese Optics Letters >Volume 17 >Issue 9 >Page 093101 > Article

Chinese Optics Letters
Vol. 17, Issue 9, 093101 (2019)

A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials

Xiaoqing Luo^1、2, Zhiyong Tan^1、2、**, Chang Wang^1、2, and Juncheng Cao^1、2、*

Author Affiliations

¹Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

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DOI: 10.3788/COL201917.093101 Cite this Article Set citation alerts

Xiaoqing Luo, Zhiyong Tan, Chang Wang, Juncheng Cao. A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials[J]. Chinese Optics Letters, 2019, 17(9): 093101 Copy Citation Text

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Abstract

We propose and experimentally demonstrate a wideband linear polarization converter in a reflection mode operating from 2.4 to 4.2 THz with conversion efficiency of more than 80%. Our device can expand the applications to a higher frequency band. A numerical simulation is performed for this metamaterial converter, which shows a good agreement with experimental results. Importantly, a concise and intuitive calculating model is proposed for the Fabry–Pérot cavity. The theoretical results indicate that the underlying reason for the enhanced polarization conversion is the additional phase difference induced by the resonance of the meta-structure and multiple reflections within the Fabry–Pérot cavity.

ε_{A u} (ω) = ε_{0} (ε_{\infty} - \frac{ω_{p}^{2}}{ω^{2} + i ω ω_{Γ}}),

(1)

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R_{m n} = \frac{I_{r, m}}{I_{i, n}} = \frac{E_{r, m}^{2}}{E_{i, m}^{2}} = r_{m n}^{2} .

(2)

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E_{i} = E_{u} + E_{v} = [E_{i} \exp (j k z) e_{u} + E_{i} \exp (j k z) e_{v}] / \sqrt{2} .

(3)

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E_{v}^{r} = E_{i} \exp (j k z) {r_{v v} + t_{v v}^{2} \exp (i \times 2 φ_{v v}^{t}) [\exp (i \times 2 k t_{s}) + r_{v v} \exp (i \times 4 k t_{s}) + r_{v v}^{2} \exp (i \times 6 k t_{s}) + \dots + r_{v v}^{n - 1} \exp (i \times 2 n k t_{s}) + \dots]} e_{v} .

(4)

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E_{v}^{r} = E_{i} \exp (j k z) [r_{v v} + t_{v v}^{2} \exp (i \times 2 φ_{v v}^{t}) \times \frac{\exp (i \times 2 k t_{s})}{1 - r_{v v} \exp (i \times 2 k t_{s})}] e_{v} .

(5)

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E_{u}^{r} = E_{i} \exp (j k z) [r_{u u} + t_{u u}^{2} \frac{\exp (i \times 2 k t_{s})}{1 - r_{u u} \exp (i \times 2 k t_{s})}] e_{u} .

(6)

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Xiaoqing Luo, Zhiyong Tan, Chang Wang, Juncheng Cao. A reflecting-type highly efficient terahertz cross-polarization converter based on metamaterials[J]. Chinese Optics Letters, 2019, 17(9): 093101

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