Fundamental Limitations of Terahertz Quarter-Wave Plates Based on High-Contrast Dielectric Gratings
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914533563432960 |
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| author | Kameshkov, Oleg Ako, Rajour Tanyi Bhaskaran, Madhu Shadrivov, Ilya |
| author_facet | Kameshkov, Oleg Ako, Rajour Tanyi Bhaskaran, Madhu Shadrivov, Ilya |
| contents | We present a systematic study of high-contrast dielectric gratings operating as broadband quarter-wave plates in the terahertz range. Using higher-order effective medium theory, we identify an achromatic operating regime characterized by a parabolic-like frequency dependence of the phase retardation. This framework reveals a fundamental bandwidth limit imposed by single-mode operation in one-dimensional rectangular gratings. We show that Fabry-Perot resonances and the higher-order modes set intrinsic constraints on achievable performance. The theoretical predictions are quantitatively validated by rigorous full-wave simulations and terahertz time-domain spectroscopy experiments. Our results reveal clear physical design rules and intrinsic performance limits for broadband terahertz dielectric grating waveplates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_04382 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fundamental Limitations of Terahertz Quarter-Wave Plates Based on High-Contrast Dielectric Gratings Kameshkov, Oleg Ako, Rajour Tanyi Bhaskaran, Madhu Shadrivov, Ilya Optics We present a systematic study of high-contrast dielectric gratings operating as broadband quarter-wave plates in the terahertz range. Using higher-order effective medium theory, we identify an achromatic operating regime characterized by a parabolic-like frequency dependence of the phase retardation. This framework reveals a fundamental bandwidth limit imposed by single-mode operation in one-dimensional rectangular gratings. We show that Fabry-Perot resonances and the higher-order modes set intrinsic constraints on achievable performance. The theoretical predictions are quantitatively validated by rigorous full-wave simulations and terahertz time-domain spectroscopy experiments. Our results reveal clear physical design rules and intrinsic performance limits for broadband terahertz dielectric grating waveplates. |
| title | Fundamental Limitations of Terahertz Quarter-Wave Plates Based on High-Contrast Dielectric Gratings |
| topic | Optics |
| url | https://arxiv.org/abs/2605.04382 |