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Title: Active ultrahigh-Q (0.2 × 10⁶) THz topological cavities on a chip
Authors: Kumar, Abhishek
Gupta, Manoj
Pitchappa, Prakash
Tan, Thomas CaiWei
Chattopadhyay, Udvas
Ducournau, Guillaume
Wang, Nan
Chong, Yidong
Singh, Ranjan
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Kumar, A., Gupta, M., Pitchappa, P., Tan, T. C., Chattopadhyay, U., Ducournau, G., Wang, N., Chong, Y. & Singh, R. (2022). Active ultrahigh-Q (0.2 × 10⁶) THz topological cavities on a chip. Advanced Materials, 34(27), 2202370-.
Project: NRF-CRP23-2019-0005 
Journal: Advanced Materials
Abstract: Rapid scaling of semiconductor devices has led to an increase in the number of processor cores and integrated functionalities onto a single chip to support the growing demands of high-speed and large-volume consumer electronics. To meet this burgeoning demand, an improved interconnect capacity in terms of bandwidth density and active tunability is required for enhanced throughput and energy efficiency. Low-loss terahertz silicon interconnects with larger bandwidth offer a solution for the existing inter-/intrachip bandwidth density and energy-efficiency bottleneck. Here, a low-loss terahertz topological interconnect-cavity system is presented that can actively route signals through sharp bends, by critically coupling to a topological cavity with an ultrahigh-quality (Q) factor of 0.2 × 106 . The topologically protected large Q factor cavity enables energy-efficient optical control showing 60 dB modulation. Dynamic control is further demonstrated of the critical coupling between the topological interconnect-cavity for on-chip active tailoring of the cavity resonance linewidth, frequency, and modulation through complete suppression of the back reflection. The silicon topological cavity is complementary metal-oxide-semiconductor (CMOS)-compatible and highly desirable for hybrid electronic-photonic technologies for sixth (6G) generation terahertz communication devices. Ultrahigh-Q cavity also paves the path for designing ultrasensitive topological sensors, terahertz topological integrated circuits, and nonlinear topological photonic devices.
ISSN: 0935-9648
DOI: 10.1002/adma.202202370
Schools: School of Physical and Mathematical Sciences 
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
The Photonics Institute 
Rights: © 2022 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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