Carbon nanotube emission enhancement in a silicon photonic crystal nanobeam cavity

In this work, we demonstrate a substantial enhancement in photoluminescence from semiconducting single-walled carbon nanotubes through integration with a small-mode-volume silicon photonic crystal nanobeam cavity. Our design approach enables precise control of the cavity resonance over a wavelength range exceeding 30 nm, effectively covering the emission spectrum of semiconducting single-walled carbon nanotubes while maintaining stable optical performance. The fabricated nanobeam cavities, embedded with polymer-sorted semiconducting single-walled carbon nanotubes, exhibit low modal volumes of V = 0.07(λ/n)³, facilitating strong light-matter interaction characterized by high coupling efficiency and a Purcell factor on the order of 10000(λ/n)³ at a wavelength of 1570 nm. This hybrid integration exploits the robust light-matter interaction properties of the cavity, leading to a pronounced increase in emission intensity from the carbon nanotubes.