Hall effect sensors using polarized electron cloud spin orientation control

Area of Science:

• Photonics and Plasmonics
• Semiconductor Devices
• Nanotechnology

Background:

• Whispering gallery modes (WGMs) are crucial for light confinement and manipulation in microring resonators.
• Plasmonic waves at the nanoscale offer unique light-matter interaction properties.
• Hall effect, current, and temperature sensing are vital in various scientific and industrial applications.

Purpose of the Study:

• To propose and simulate a silicon microring circuit integrated with a gold film for multi-functional sensing.
• To explore the application of space-time distortion control using polarized laser sources.
• To investigate the generation of whispering gallery modes for plasmonic wave applications.

Main Methods:

• A silicon microring resonator circuit with an embedded gold film was designed.
• Input polarized laser light at 1.55 μm wavelength was used to excite whispering gallery modes.
• The interaction of WGMs with the gold film generated plasmonic waves, leading to trapped electron cloud oscillation.
• Hall voltage generation was simulated based on the induced magnetic field from electric current.

Main Results:

• The proposed circuit demonstrated the capability for Hall effect, current, and temperature sensing.
• Optimum sensitivities achieved were 0.12 μVT⁻¹, 0.9 μVA⁻¹, and 6.0 × 10⁻² μVK⁻¹ for Hall effect, current, and temperature, respectively.
• The sensor exhibited an optimal response time of 1.9 fs.

Conclusions:

• The silicon microring circuit with embedded gold film is a promising platform for integrated, high-performance sensors.
• The device leverages plasmonic effects and space-time distortion for sensitive detection.
• The rapid response time and multi-functional sensing capabilities highlight its potential for advanced applications.