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EACON 2020

EurAsian Conference on Nanophotonics

April 6 – 9, 2020 / Jena, Germany

Yu-Jung Lu

Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
Department of Physics, National Taiwan University, Taipei 10617, Taiwan

Controlling Light-matter Interactions at Nanoscale with Plasmonics: From Spontaneous Emission to Lasing

Controlling light emission of quantum emitters, such as semiconductor quantum dots, is a central theme of nanotechnology. Typically, the emitted power from an array of quantum emitters is modulated by changing the optical or electrical pump intensity, within a given nanostructured environment. Here, we propose and demonstrate a conceptually different approach to emitter power modulation [1]. We hold the optical pump intensity constant, but modulate the radiative emission rate, the emitted power, and the quantum efficiency via dynamical changes to the local density of optical states (LDOS). The LDOS is modulated by changing the carrier density, under field effect gate control, in a plasmonic titanium nitride layer nearby the emitters. This in turn modulates the dielectric permittivity of the titanium nitride from positive to negative values, through the so-called ‘epsilon-near-zero’ regime that marks the borderline between dielectric and plasmonic media. In this work, we use a TiN/SiO2/Ag plasmonic heterostructure to demonstrate a new active plasmonic mechanism for modulating light emission –for the first time at visible wavelengths that is extensible to other type of quantum emitters. In addition, it may pave a path towards ultrathin LCD-free displays with long durability, reduced pixel size and large viewing angle. Moreover, we report a new approach to modulating laser emission in which, at constant optical pumping rate, a gated field effect structure is used to control the LDOS for InP or lead halide perovskite quantum dots coupled to TiN plasmonic cavity heterostructures that tuning the quantum dots from spontaneous emission to lasing. The mechanism of tunable plasmonic lasing will be discussed.

[1] Yu-Jung Lu et al. “Dynamically Controlled Purcell Enhancement of Visible Spontaneous
Emission in a Gated Plasmonic Heterostructure.” Nature Communications 8, 1631 (2017).

Further Talks

Andrea Csáki

Microfludic Synthesis of plasmonic Nanoparticles for Sensing Applications

Andrey Turchanin

Controlled growth of transition metal dichalcogenide monolayers for applications in nanoelectronic and nanophotonic devices

Chi Chen

Near Field Spectroscopic Imaging: from Hard to Soft Materials

Chi-How Peng

Cobalt mediated controlled/living radical polymerization: from mechanism understanding to materials application

Chun-Hong Kuo

Bridging Energy and Chemistry via Nanoarchitectonic Engineering at Atomic Scale

Falk Eilenberger

Integration of two-dimensional materials in optical systems for nonlinear optics, sensing, and single photon sources

Frank Setzpfandt

Nonlinear frequency conversion in nanostructured optical systems for application in quantum photonics

Heng-Liang Wu

Controlling the Oxidation State of Cu Electrode and Reaction Intermediates for Electrochemical CO2 Reduction to Ethylene

Kien-Voon Kong

Direct Observation of Reaction Intermediates of Metal-based Therapeutic Agents in Single Living Cell Using TERS

Maria Wächtler

Quantum confined semiconductor nanostructures in light-driven catalysis

Martin Presselt

Supramolecular Control of Optical and Electronical Properties of Two-Dimensional Dye Layers

Po-Chiao Lin

New Environment Sensitive Fluorophores with Color-Tailored Emission: In Vivo Monitoring of Carbonic Anhydrases Expression on Growth of Larval Zebrafish

Shangjr (Felix) Gwo

Plasmonic Metasurface-Enhanced Linear and Nonlinear Processes in Two-Dimensional Semiconductors

Ta-Jen Yen

Empowering Bilayer MoS2 by Engineered Plasmonic Nanostructures for Optoelectronic Applications

Tiow-Gan Ong

Carbodicarbene, Carbogenic Maverick, Not a Moderate!

Volker Deckert

Plasmon Enhanced Probe Spectroscopies – Structural Investigation of Nanoscale Objects

Yi-Tsu Chan

Molecular self-assembly methodology for rational construction of metallosupramolecules with high structural complexity

Yian Tai

Toward a universal polymeric material for electrode buffer layers in organic optoelectronics

Yu-Chieh Cheng

Kirigami-based soft robots with light-responsive properties

Yu-Jung Lu

Controlling Light-matter Interactions at Nanoscale with Plasmonics: From Spontaneous Emission to Lasing