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Reconfigurable multiwavelength nanophotonic circuit based on a low-voltage, optically readable engineered resistive
Santosh Kumar1, Ashutosh Kumar1, Rahul Dev Mishra1
1Optoelectronic Nanodevice Research Laboratory (ONRL), Department of Electrical Engineering, Indian Institute of Technology (IIT) Indore, 453552, India. phd2101202005@iiti.ac.in.
Nanoscale
|April 9, 2025
Summary
Engineered nanophotonic circuits with resistive switches enable optical wavelength control for advanced computing. These devices offer high extinction ratios and reconfigurability for neuromorphic and quantum applications.
Area of Science:
- Photonics and Nanotechnology
- Materials Science
- Electrical Engineering
Background:
- Nanoscale optical functionalities are crucial for unconventional computing paradigms like neuromorphic and quantum information processing.
- Resistive switching devices with optical readability are of significant interest for high-density non-volatile memory and computing.
Purpose of the Study:
- To propose and demonstrate a multiwavelength nanophotonic circuit with electrically controllable optical channels.
- To investigate the performance of Ag-SiO2-ITO resistive switches on a silicon rib structure for optical functionalities.
Main Methods:
- Fabrication of a four-layered Ag-SiO2-ITO device on a silicon rib structure.
- Utilizing resistive switching via conductive filament formation/rupture in SiO2 to modulate optical absorption.
- Characterization of optical performance including extinction ratio and multiwavelength functionality.
Main Results:
- Achieved a 27 dB extinction ratio for a 10 μm × 500 nm device operated at ±2 V.
- Demonstrated multiwavelength functionality with reconfigurable channel removal using identical sources and 2x1 couplers.
- Observed low-voltage operation, rapid switching speed, and excellent retention.
Conclusions:
- The engineered nanophotonic circuit offers a promising platform for advanced memory, optical communication, and unconventional computing.
- The device's properties, including high extinction ratio and reconfigurability, make it suitable for programmable photonic circuits.
- The use of ITO enhances ion migration, overcoming SiO2 resistance for efficient device operation.
