- Speaker: Prof. No, You-Shin (Konkuk Univ)
- Date: October 31, 2017
- Place: Science Building 433
Low-dimensional nanomaterials and nanostructures are emerging building blocks in photonics, nanoelectronics and bioelectronics. In particular, semiconductor nanoscale architectures that can be controllably synthesized or fabricated into different morphologies with tunable electrical and optical properties enable the generation and detection of electrical and optical signals with high sensitivity and spatial resolution. In this talk, I will discuss various active optoelectronic devices using top-down-fabricated and bottom-up-synthesized semiconductors. First, I demonstrate the efficient integration of an electrically driven nanowire light source with metallic tapered nanostrips, exhibiting the generation and propagation of surface plasmons as well as the subwavelength-scale nanofocusing of light. Second, I will present a new nanowire structure in which the material and dopant are modulated specifically at only one end of nanowires, termed tip-modulated nanowires. Characterization of the electrical and optical properties of devices configured from these new structures demonstrates the capability of tip-localized electronic and photonic detection. Lastly, I will discuss the recent advances in shape-controlled deterministic assembly techniques of one-dimensional nanomaterials, enabling the realization of key photonic elements. Our demonstrations of active semiconductor nanodevices provide a substantial opportunity in areas ranging from nanoscale light manipulation, optoelectronic signal detection to biological and chemical sensing.