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Viterbi Faculty of Electrical Engineering, Technion
Manipulation of emission from semiconductor nano-devices using plasmonic nano-structures
My research broaden our knowledge regarding the effects of plasmonic nano antennas and other nano structures on properties of a nearby semiconductor light emitter or absorber.
Plasmonic nano antennas own properties allows for an efficient light manipulation and control which are utilized to enhance devices performances. On the first part of my research I focus the attention on the nano antennas properties, including polarization control, wavelength tunability and the ability to focus and confine light to sub-wavelength volumes. On the second part I show the incorporation of plasmonic nano particles and nano antennas into several devices, increasing the absorption in those devices, thus improving its efficiency. The investigated devices are a hybrid organic-inorganic solar cell, GaN quantum cascade detector, MIS photodetector and a superconductor nanowire single photon detector.
Next I show emission enhancement achieved by the nano antennas. The main focus of this section is emission from electrical InGaAs LED and from InP nano wires positioned in the center of Rosette nano antennas. Properties such as radiation rates and life time, quantum efficiency and extraction efficiency, directionality and polarization are discussed. Also the main design differences between antennas for light emission to antennas for light absorption are presented.
On the last part of my research I present the nano-flag optical antenna, which is an InP flag-like structure epitaxially grown in a single process, that due to its size and shape have many of the properties of a nano antenna, while being an active material. I fully characterize its optical properties, compare it to related plasmonic nano antennas. I show how it can improve devices and allow the realization of smart and functional devices. Moreover, I show nonlinear effects empowered by the nanoflags’ shape and size. I claim this type of semiconductor nano structures are the next phase of nano antennas, to advance nano photonics into the next level of efficiency and applicability.
*PhD student supervised by Prof. Meir Orenstein.