Researchers Unveil On-Chip Valley Nanocircuit With 0.97 Polarization Selectivity
Updated
Updated · Nature.com · May 25
Researchers Unveil On-Chip Valley Nanocircuit With 0.97 Polarization Selectivity
1 articles · Updated · Nature.com · May 25
Summary
A hybrid nanocircuit reported in Nature Photonics generated, routed and electrically read out valley-dependent chiral photons on chip at room temperature, addressing a key integration hurdle in valley optoelectronics.
The device combines a chirality-selective meta-waveguide with an encapsulated tungsten disulfide monolayer, producing near-unity valley-dependent second-harmonic photons and coupling them into unidirectional waveguide modes with 0.97 selectivity.
Few-layer tungsten diselenide photodetectors then detected only the above-bandgap upconverted photons, enabling all-on-chip processing of valley-multiplexed images rather than separate optical generation and electronic readout stages.
The result closes a long-standing gap between valley-photon generation, selective routing and electrical detection, and points toward compact, programmable valley information processors and light-based valleytronic quantum technologies.
Beyond just faster computers, how will processing information with 'valley' light change AI and data security forever?
This quantum chip works at room temperature. What’s the biggest hurdle preventing it from powering your next smartphone?
On-Chip Valley Nanocircuit Achieves 0.97 Polarization Selectivity: A 2025 Breakthrough for Scalable Valleytronics and Quantum Photonics
Overview
In 2025, researchers achieved a major breakthrough by demonstrating an on-chip valley nanocircuit, marking a new era for valleytronics. This innovation solves the long-standing challenge of fully integrated valley optoelectronics by combining chirality-selective meta-waveguide photodetectors with transition metal dichalcogenides. At its core, an encapsulated tungsten disulfide (WS₂) monolayer generates highly selective valley-dependent chiral photons using second harmonic generation. This development is a crucial step toward compact, programmable, and scalable valley information processing, laying the foundation for future light-based valleytronic quantum technologies.