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Engineering the Losses and Beam Divergence in Arrays of Patch Antenna Microcavities for Terahertz Sources

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Abstract

We perform a comprehensive study on the emission from finite arrays of patch antenna microcavities designed for the terahertz range by using a finite element method. The emission properties including quality factors, far-field pattern, and photon extraction efficiency are investigated for etched and non-etched structures as a function of the number of resonators, the dielectric layer thickness, and period of the array. In addition, the simulations are achieved for lossy and perfect metals and dielectric layers, allowing to extract the radiative and non-radiative contributions to the total quality factors of the arrays. Our study shows that this structure can be optimized to obtain low beam divergence (FWHM <10°) and photon extraction efficiencies >50% while keeping a strongly localized mode. These results show that the use of these microcavities would lead to efficient terahertz emitters with a low divergence vertical emission and engineered losses.

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Acknowledgments

This work was supported by JSPS Kakenhi grant number JP17K14126.

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Authors and Affiliations

  1. Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Japan

    Julien Madéo, Joel Pérez-Urquizo & Keshav M. Dani

  2. Laboratoire Matériaux et Phénomènes Quantiques, Université Paris Diderot, Sorbonne Paris Cité, CNRS-UMR 7162, 75013, Paris, France

    Yanko Todorov & Carlo Sirtori

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  1. Julien Madéo
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  2. Joel Pérez-Urquizo
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  3. Yanko Todorov
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  4. Carlo Sirtori
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  5. Keshav M. Dani
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Correspondence to Julien Madéo.

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Madéo, J., Pérez-Urquizo, J., Todorov, Y. et al. Engineering the Losses and Beam Divergence in Arrays of Patch Antenna Microcavities for Terahertz Sources. J Infrared Milli Terahz Waves 38, 1321–1330 (2017). https://doi.org/10.1007/s10762-017-0418-6

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  • DOI: https://doi.org/10.1007/s10762-017-0418-6

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