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Dynamically Adjusting Borophene-Based Plasmon-Induced Transparency in a Polymer-Separated Hybrid System for
Kunpeng Xiao1, Junming Li1, Hui Zhang1,2
1School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Polymers
|July 29, 2023
Summary
Borophene enables ultracompact optical devices by supporting confined plasmonic modes. A novel hybrid system demonstrates tunable plasmon-induced transparency for sensitive refractive index sensing, applicable to point-of-care diagnostics.
Area of Science:
- Materials Science
- Nanophotonics
- Plasmonics
Background:
- Borophene is a 2D material with confined plasmonic modes in visible and near-infrared bands.
- This enables light manipulation at deep subwavelength scales for ultracompact optical devices.
Purpose of the Study:
- To theoretically explore a borophene-based plasmonic hybrid system for tunable plasmon-induced transparency (PIT).
- To investigate the system's potential for refractive index (RI) sensing applications.
Main Methods:
- A hybrid system comprising a continuous borophene monolayer (CBM) and sodium nanostrip gratings (SNGs) separated by a polymer spacer was theoretically modeled.
- Strong coupling between dark (borophene surface plasmon - BSP) and bright (SNG localized plasmon resonance) modes was analyzed.
- The effect of polymer layer thickness and borophene electron density on PIT and sensing performance was studied.
Main Results:
- A dynamically tunable PIT effect was achieved by controlling borophene.
- The hybrid system exhibited a high RI-sensing performance (643.8 nm/RIU).
- Adjustable wavebands (1420-2150 nm) were demonstrated by tuning borophene's electron density.
Conclusions:
- The borophene-based hybrid system offers a novel concept for active plasmonic sensors.
- Electrically gating borophene allows for dynamic tunability and sensitive RI sensing.
- Promising applications in next-generation point-of-care (PoC) biomedical diagnostics are highlighted.
