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Tailoring carbon nanotubes optical properties through chirality-wise silicon ring resonators
Elena Durán-Valdeiglesias1, Weiwei Zhang1,2, Carlos Alonso-Ramos1
1Centre for Nanoscience and Nanotechnology, CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N - Orsay, 91405, Orsay cedex, France.
Scientific Reports
|July 28, 2018
Summary
Silicon micro-ring resonators enhance light interaction with semiconducting single-walled carbon nanotubes (s-SWNTs). This boosts s-SWNT light emission and allows tailoring optical properties for silicon photonics.
Area of Science:
- Materials Science
- Optoelectronics
- Nanotechnology
Background:
- Semiconducting single-walled carbon nanotubes (s-SWNTs) offer potential for compact hybrid photonic circuits, particularly as light sources in silicon photonics.
- Key challenges include limited light interaction between s-SWNTs and silicon waveguides and low s-SWNT quantum efficiency.
- Silicon micro-ring resonators can enhance light-s-SWNT interaction via resonant light recirculation.
Purpose of the Study:
- To investigate the use of silicon micro-ring resonators to overcome limitations in s-SWNT-based silicon photonics.
- To demonstrate chirality-selective photoluminescence enhancement of s-SWNTs using micro-ring resonators.
- To analyze waveguide modes for optimizing light-s-SWNT interaction.
Main Methods:
- Fabrication and characterization of silicon micro-ring resonators integrated with polymer-sorted s-SWNTs.
- Photoluminescence spectroscopy to measure emission enhancement and chirality selectivity.
- Finite-difference time-domain (FDTD) simulations to analyze light-s-SWNT interaction with different waveguide modes (TE and TM).
Main Results:
- Silicon ring resonators achieve chirality-wise photoluminescence resonance enhancement for s-SWNTs.
- Micro-ring geometry design enables selective enhancement of specific SWNT chiralities, such as (8,6) or (8,7).
- Analysis predicts stronger light-s-SWNT interaction for transverse-magnetic (TM) modes compared to transverse-electric (TE) modes in nanometric waveguides.
Conclusions:
- Silicon micro-ring resonators provide a method to enhance and tune s-SWNT optical properties for integrated photonics.
- This approach offers a new degree of freedom for controlling s-SWNT emission based on chirality.
- Optimizing waveguide modes (TM) is crucial for maximizing light-s-SWNT interaction in future hybrid devices.
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