Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/170387
Title: Electrically tunable topological notch filter for THz integrated photonics
Authors: Gupta, Manoj
Kumar, Abhishek
Singh, Ranjan
Issue Date: 2023
Source: Gupta, M., Kumar, A. & Singh, R. (2023). Electrically tunable topological notch filter for THz integrated photonics. Advanced Optical Materials. https://dx.doi.org/10.1002/adom.202301051
Project: NRF-CRP23-2019-0005 
Journal: Advanced Optical Materials 
Abstract: 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.
URI: https://hdl.handle.net/10356/170387
ISSN: 2195-1071
DOI: 10.1002/adom.202301051
DOI (Related Dataset): 10.21979/N9/GVCVO0
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: © 2023 Wiley-VCH GmbH. All rights reserved. This is the peer reviewed version of the following article: Gupta, M., Kumar, A. & Singh, R. (2023). Electrically tunable topological notch filter for THz integrated photonics. Advanced Optical Materials, which has been published in final form at https://doi.org/10.1002/adom.202301051. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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