Optical Nanostructure Team
Nanomaterials Field
We apply nanophotonic concept to realize noble radiative heat transfer with nanostructures.
Group Leader:Satoshi Ishii
Probing Two-Dimensional Electron Gases of AlGaN/GaN Heterostructures by Nanoscale Infrared Near-Field Spectroscopy
Current Topics
Infrared near-field spectroscopy (nano-FTIR) provides three-dimensional nanoscopic resolution for probing chemical and physical properties. This capability is ideal for studying two-dimensional electron gases (2DEGs), which are only a few nanometers thick and buried beneath capping layers. We noninvasively probe 2DEGs in AlGaN/GaN heterostructures using nano-FTIR. The amplitudes and phases of higher harmonics are sensitive to carrier concentration, as supported by finite-dipole modeling. Hyperspectral imaging provides nanometric resolution visualization of the 2DEG under ambient conditions.
Schematic of nano-FTIR measurement scanning a cross-section of an AlGaN/GaN, together with the measured spectra and image.
References
Group members
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Satoshi Ishii
- Team Leader