Abstract
Semiconducting single walled carbon nanotubes (s-SWNT) have an immense potential for the development of active optoelectronic functionalities in ultra-compact hybrid photonic circuits. Specifically, s-SWNT have been identified as a very promising solution to implement light sources in the silicon photonics platform. Still, two major challenges remain to fully exploit the potential of this hybrid technology: the limited interaction between s-SWNTs and Si waveguides and the low quantum efficiency of s-SWNTs emission. Silicon micro-ring resonators have the potential capability to overcome these limitations, by providing enhanced light s-SWNT interaction through resonant light recirculation. Here, we demonstrate that Si ring resonators provide SWNT chirality-wise photoluminescence resonance enhancement, releasing a new degree of freedom to tailor s-SWNT optical properties. Specifically, we show that judicious design of the micro-ring geometry allows selectively promoting the emission enhancement of either (8,6) or (8,7) SWNT chiralities present in a high-purity polymer-sorted s-SWNT solution. In addition, we present an analysis of nanometric-sized silicon-on-insulator waveguides that predicts stronger light s-SWNT interaction for transverse-magnetic (TM) modes than for conventionally used transverse-electric (TE) modes.
Highlights
Driven by their outstanding electrical properties, semiconducting single walled carbon nanotubes (s-SWNTs) are being widely investigated for the realization of ultra-compact field effect transistors (FET), reaching the nanoscale1,2, with very high on-off current ratios3
As conventionally done when modeling these polymer-sorted SWNTs17,25,26, we considered a homogeneous top cladding with a refractive index of 1.6, which emulates the scenario of drop casting deposition
For both, transversal Ex and longitudinal Ez components, the preferred SWNTs orientations are parallel to the chip surface, which makes them very interesting for scenarios relying on planar deposition techniques
Summary
Driven by their outstanding electrical properties, semiconducting single walled carbon nanotubes (s-SWNTs) are being widely investigated for the realization of ultra-compact field effect transistors (FET), reaching the nanoscale, with very high on-off current ratios. We demonstrate that integration with Si micro-ring resonators provides SWNT chirality-dependent interaction enhancement, allowing further tunability of the optical properties of hybrid Si-s-SWNT photonic devices. We developed a selective deposition technique that provides simple and tight control of the regions where s-SWNTs interact with the Si waveguides, minimizing detrimental light absorption from non-excited SWNTs. We theoretically and experimentally studied the s-SWNTs interaction with SOI micro-ring resonators, implemented with strip waveguides optimized to maximize the longitudinal TM component and optimized to yield resonant-enhancement at specific wavelength ranges corresponding to either [8,6] or [8,7] s-SWNT chiralities
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