Research Interest
List of topics
- Nanophotonic control of low D properties
- Optoelectronic devices based on low-dimensional materials
- Novel ellipsometry for low D heterostructure
Related papers
- Measuring the optical permittivity of two-dimensional materials without a priori knowledge on electronic transitions, Nanophotonics, 8, 2, 263 (2019).
- Polarimetric microscopy for optical control and high precision measurement of valley polarization, Review of Scientific Instruments, 89, 6, 063118 (2018).
- Large-area plasmon enhanced two-dimensional MoS2, Nanoscale, 9, 16244-16248 (2017).
- Efficient Fizeau Drag from Dirac electrons in monolayer graphene, Nature, 594 (7864), 517-521 (2021).
We explore novel physics on the light-matter interaction in quantum systems including low-dimensional condensed matter. Low dimensional materials exhibits strong light-matter interaction even though they have atomic thicknesses. They also possess exotic and novel qunatum properties that cannot be found in their higher dimensional counterparts.
Also, quantum systems such as graphene, carbon nanotubes, and grain boundaries in 2D TMDs can support surface plasmons, a collective oscillation of electrons at the metallic surface. Such quantum plasmons exhibit unique properties that cannot be found in classical plasmons of noble metals. We study the novel properties of quantum plasmons and their nanophotonic application.
List of topics
- Luttinger liquid
- Exciton-polaritons
Related papers
- Infrared light-emitting devices from antenna-coupled Luttinger liquid plasmons in carbon nanotubes, Physical Review Letters, 127, 257702 (2021).
- Gate tunable plasmons in mixed-dimensional van der Waals heterostructures, Nature Communications, 12, 5039 (2021).
List of topics
- Discovery of nonreciprocal materials in nature
- Nanophotonic control of optical angular momentum
- Nanophotonic chiral sensing
Related papers
- Chiral Light-Matter Interaction in Optical Resonators, Physical Review Letters, 114(20), 203003 (2015).
- Microscopic Origin of Surface-enhanced Circular Dichroism, ACS photonics, 4, 8, 2047-2052 (2017).
- Globally enhanced chiral field generation by negative-index metamaterials, Physical Review B, 89(16), 161405(R) (2014).
List of topics
- Optical nonreciprocity in metamaterials
- Nanophotonic sensor for bi-isotropic materials
Related papers
- Effective permittivity for resonant plasmonic nanoparticle systems via dressed polarizability, Optics Express, 20(15), 16480 (2012).
- Loss-free negative index metamaterials using forward light scattering in dielectric meta-atoms, ACS Photonics, 5, 4, 1370 (2018).
Techniques
Experiments
We develop polarimetric spectroscopy and spectroscopic ellipsometry to study dielectric, excitonic, and plasmonic properties of low dimensional materials. We also plan to establish the infrared scattering near-field optical microscopy (IR SNOM) in the near future. IR SNOM enables to study infrared quantum plasmons in graphene and carbon nanotubes.
Theory
We also perform theoretical studies for low-dimensional physics. We apply a semi-classical electromagnetic theory and a quantum mechanical theory to nanophotonic and low-dimensional problems. We also perform numerical simulations from electromagnetics to phononic mechanics.