Manipulating the optical properties of semiconductor nanostructures for integrated plasmonic applications Dr. Ning Liu Materials & Surface Science Institute Department of Physics & Energy University of Limerick Oct 26th, 2015 KITPC, Beijing

Outline Integrated Plasmonics  Introduction  Top-down approaches to micro(nano)- lasers and amplifiers.  Bottom-up approach to plasmonic waveguides, lasers, and logic circuits

Integrated Photonics How light can be integrated on a chip ? From Intel Why using light to process information? Faster Larger capacity (with different wavelength) Here at UL, we work on: Material growth Device fabrication Integration

Further reduce the size of optical devices Surface plasmons (SPs), are coherent electron oscillations that exist at the interface between any two materials where the real part of the dielectric function changes sign across the interface (e.g. a metal-dielectric interface). Usually, the excitation of surface plasmons by light is denoted as: localized surface plasmon resonance (LSPR) for nanometer-sized metallic structures; surface plasmon resonance (SPR) for waveguided structures. J. Henzie et al. Annu. Rev. Phys. Chem. 60, 147 (2009).

Plasmonic lasers M. A. Noginov et al., Nature , Ren-min Ma et al., Nature Materials , 110. Rupert F. Oulton et al., Nature , 629. Y-J. Lu et al., Science , 450.

Hybrid plasmonic amplifiers from CdSe NBs using ‘pump-probe’ setup Liu, et al. Scientific Reports, , 1967.

Giant optical gain: g = 6755 cm -1 Photonic waveguide Why is the gain threshold is so low?

Current as a function of applied voltage across the Ag-Al 2 O 3 -Ag junction

Can we synthesize metal-semiconductor core-shell waveguides?

Applications Neil R. et al, Nature Nanotechnology, 4, , 2009 Probe tip Incorporation in Various Microscope Techniques, Drug Delivery in Cells Ed. Nicoleta Lupu, Electrodeposited Nanowire and Their Applications, pp. 222, 2010

12 of 23 Can we control better the attachment of semiconductor material to the substrate ?

13 of 32 Can we use top-down approach to obtain plasmonic waveguides, lasers, amplifier, and logic units?

Summary Integrated Plasmonics  Top-down approaches  Bottom-up approach

Dr. Christophe Silien (UL) Dr. Tofail Syed (UL) Dr. Kevin M. Ryan (UL) Ms. Pai Liu (UL) Ms. Isabel Pita (UL) Mr. Matthew Gleeson (UL) Dr. Yina Guo (UL) Prof. Hongxing Xu Prof. Hong Wei Dr. Jing Li Dr. Xiaorui Tian Mr. Zhuoxian Wang Prof. Anlian Pan Dr. Brian Corbett (Tyndall) Prof. Martyn Pemble (Tyndall)