Electrically tunable topological notch filter for THz integrated photonics
Electromagnetic filtering is essential for emerging integrated photonic technologies and widely adaptable processing of high-bandwidth signals. The conventional electro-optic modulator-based photonic approach for signal filtering at microwave frequencies cannot be implemented at terahertz (THz) freq...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/170387 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Electromagnetic filtering is essential for emerging integrated photonic technologies and widely adaptable processing of high-bandwidth signals. The conventional electro-optic modulator-based photonic approach for signal filtering at microwave frequencies cannot be implemented at terahertz (THz) frequencies due to the unavailability of the THz signal-driven optical modulator. Here, an electrically tunable on-chip THz photonic notch filter based on the topologically protected valley hall waveguide-cavity platform is demonstrated. The device shows a significantly large notch suppression depth of more than 20 dB with a return loss of 13 dB in the entire tuning range of notch frequency. The feedback control circuit enables precise control of the notch frequency shift with a minimum step size of 7 MHz. This work extends the application of topological photonic crystals in developing THz-integrated photonic devices for transformative technologies, including sixth-generation (6G) communication and high-resolution spectral sensing. |
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