Nonlinear Terahertz Polaritonics in a Quantum Paraelectric
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911077512511488 |
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| author | Shen, Chao Verdi, Carla Babkin, Serafim Serbyn, Maksym Alpichshev, Zhanybek |
| author_facet | Shen, Chao Verdi, Carla Babkin, Serafim Serbyn, Maksym Alpichshev, Zhanybek |
| contents | Terahertz (THz) frequency range holds immense potential for high-speed data processing and signal manipulation. However, a fundamental challenge remains: the efficient and tunable control of THz electromagnetic fields. One promising approach is polaritonic engineering, which leverages hybrid light-matter excitations to manipulate THz fields at sub-wavelength scales. Here, we introduce quantum paraelectric materials as a powerful new platform for THz phonon-polaritonics, leveraging the pronounced nonlinearities of incipient ferroelectrics. These nonlinearities enable strong self- and cross-coupling between polaritons, facilitating all-optical, reconfigurable THz signal control. Using a novel space- and time-resolved imaging technique, we directly observe the ballistic propagation of bulk phonon-polaritons in SrTiO$_3$, and uncover soliton-like, dispersion-free transport in its low-temperature, quantum-fluctuation-dominated phase. Our results establish quantum paraelectric solids as a versatile and highly tunable medium for next-generation THz photonics and ultrafast information processing. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_19358 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonlinear Terahertz Polaritonics in a Quantum Paraelectric Shen, Chao Verdi, Carla Babkin, Serafim Serbyn, Maksym Alpichshev, Zhanybek Optics Other Condensed Matter Terahertz (THz) frequency range holds immense potential for high-speed data processing and signal manipulation. However, a fundamental challenge remains: the efficient and tunable control of THz electromagnetic fields. One promising approach is polaritonic engineering, which leverages hybrid light-matter excitations to manipulate THz fields at sub-wavelength scales. Here, we introduce quantum paraelectric materials as a powerful new platform for THz phonon-polaritonics, leveraging the pronounced nonlinearities of incipient ferroelectrics. These nonlinearities enable strong self- and cross-coupling between polaritons, facilitating all-optical, reconfigurable THz signal control. Using a novel space- and time-resolved imaging technique, we directly observe the ballistic propagation of bulk phonon-polaritons in SrTiO$_3$, and uncover soliton-like, dispersion-free transport in its low-temperature, quantum-fluctuation-dominated phase. Our results establish quantum paraelectric solids as a versatile and highly tunable medium for next-generation THz photonics and ultrafast information processing. |
| title | Nonlinear Terahertz Polaritonics in a Quantum Paraelectric |
| topic | Optics Other Condensed Matter |
| url | https://arxiv.org/abs/2507.19358 |