Research
Our primary interest is in the development and engineering of photonic and optoelectronic devices that would allow for manipulation of quantum states, as well as understanding the underlying physics in the operation of such devices. We exploit state-of-the-art semiconductor processing technology to fabricate nanoscale devices and perform experiments that combine microspectroscopy with electronic techniques. Our current focus is on devices that utilize individual single-walled carbon nanotubes and atomically-thin layered materials.
Introduction to single-walled carbon nanotubes
Chirality detemines the structure of carbon nanotubes at the atomic level.
Optical properties of carbon nanotubes
Carbon nanotubes have unique optical properties because of their one-dimensional structure.- Exciton diffusion in carbon nanotubes
- Giant circular dichroism in individual air-suspended carbon nanotubes
- Exciton-exciton annihilation in air-suspended carbon nanotubes
- Room-temperature single photon emission from air-suspended carbon nanotubes
- Single carbon nanotubes as ultrasmall all-optical memories
- Organic molecular tuning of many-body interaction energies in air-suspended carbon nanotubes
- Super-resolution fluorescence imaging of carbon nanotubes using a nonlinear excitonic process
- High efficiency dark-to-bright exciton conversion in carbon nanotubes
- Quantum emission assisted by energy landscape modification in pentacene-decorated carbon nanotubes
- Intrinsic process for upconversion photoluminescence via K-momentum-phonon coupling in carbon nanotubes
Carbon nanotube optoelectronics
Semiconducting carbon nanotubes have direct bandgap, making them suitable for optoelectronic devices.- Gate-induced blueshift and quenching of photoluminescence in carbon nanotubes
- Spontaneous exciton dissociation in carbon nanotubes
- Stark effect of excitons in individual air-suspended carbon nanotubes
- Gate-controlled generation of optical pulse trains using individual carbon nanotubes
- Gate-voltage induced trions in suspended carbon nanotubes
- Electric-field induced activation of dark excitonic states in carbon nanotubes
- Cold exciton electroluminescence from air-suspended carbon nanotube split-gate devices
- Molecular screening effects on exciton-carrier interactions in suspended carbon nanotubes
Carbon nanotube photonics
Integrating nanotube light emitters with photonic structures may open up possibilities for nanoscale optical circuits.- Enhancement of carbon nanotube photoluminescence by photonic crystals
- Optical coupling of individual carbon nanotube emitters to silicon microdisk resonators
- High efficiency coupling of individual carbon nanotubes to photonic crystal nanobeam cavities
- Localized guided-mode and cavity-mode double resonance in photonic crystal nanocavities
- Spectral tuning of optical coupling between air-mode nanobeam cavities and individual carbon nanotubes
- Enhanced Raman scattering of graphene using double resonance in silicon photonic crystal nanocavities
- Waveguide coupled cavity-enhanced light emission from individual carbon nanotubes
- Near-unity radiative quantum efficiency of excitons in carbon nanotubes
Mixed-dimensional heterostructures
One-dimensional carbon nanotubes can be combined with two-dimensional layered materials to form exotic heterostructures.- Hexagonal boron nitride as an ideal substrate for carbon nanotube photonics
- Deterministic transfer of optical-quality carbon nanotubes for atomically defined technology
- Resonant exciton transfer in mixed-dimensional heterostructures
- Quantum emission from interface excitons in mixed-dimensional heterostructures
Van der Waals hybrid photonics
Photonic structures for integrating atomically-thin layered materials to achieve novel functionalities.- Chiral modes near exceptional points in symmetry broken h1 photonic crystal cavities
- Quantization of mode shifts in nanocavities integrated with atomically thin sheets
- Van der Waals decoration of ultra-high Q silica microcavities for χ(2)-χ(3) hybrid nonlinear photonics
- Self-aligned hybrid nanocavities using atomically thin materials