Unidirectional light-emission from in-plane tunneling nanoantennas (Conference Presentation)

Surya Prakash Gurunarayanan; Niels Verellen; Vyacheslav S. Zharinov; Finub James Shirley; Victor V. Moshchalkov; Marc M. Heyns; Joris Van de Vondel; Iuliana P. Radu; Pol Van Dorpe

doi:10.1117/12.2288380

14 March 2018 Unidirectional light-emission from in-plane tunneling nanoantennas (Conference Presentation)

Surya Prakash Gurunarayanan, Niels Verellen, Vyacheslav S. Zharinov, Finub James Shirley, Victor V. Moshchalkov, Marc M. Heyns, Joris Van de Vondel, Iuliana P. Radu, Pol Van Dorpe

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Proceedings Volume 10530, Ultrafast Phenomena and Nanophotonics XXII; 105300I (2018) https://doi.org/10.1117/12.2288380
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

Through the effect of Purcell enhancement, nanoantennas strongly modify the local density of optical states and control the emission of coupled emitters. These antennas determine, in addition to the emission spectrum and polarization, also the angular distribution of the emitted photons, i.e., the radiation pattern. Nearly all directional nanoantennas reported so far, rely on external excitation schemes such as a laser or scanning tunneling microscope (STM) tip, which severely hamper on-chip integration. Here, we experimentally demonstrate for the first time, unidirectional light emission from electrically driven in-plane two-wire nanoantennas in the shape of the letter V. The antenna wires are connected with narrow electrical leads which support electrical currents while preserving the resonant properties of the antenna [1]. A nanoscopic tunneling gap is formed at the feed point of the antenna through a controlled electromigration procedure. Strong far-field interference between the spontaneous dipolar light emission of the tunnel junction and the fundamental quadrupolar resonance of the antenna gives rise to a directional radiation pattern [2]. We show that this directivity can be actively tuned with the applied voltage, and passively tuned with the antenna geometry. The experimental findings are analyzed in detail through electro-optical characterization and extensive numerical simulations. These fully configurable ultra-fast tunneling nanoantennas seamlessly exploit light-matter interactions at the nanoscale and set a new paradigm for directing optical energy on chip using an extremely small footprint. [1] Kern et al. Nature Photonics (2015) 9, 582–586; [2] Vercruysse et al. ACS Nano (2014) 8(8), 8232−8241.

Conference Presentation

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Surya Prakash Gurunarayanan, Niels Verellen, Vyacheslav S. Zharinov, Finub James Shirley, Victor V. Moshchalkov, Marc M. Heyns, Joris Van de Vondel, Iuliana P. Radu, and Pol Van Dorpe "Unidirectional light-emission from in-plane tunneling nanoantennas (Conference Presentation)", Proc. SPIE 10530, Ultrafast Phenomena and Nanophotonics XXII, 105300I (14 March 2018); https://doi.org/10.1117/12.2288380

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KEYWORDS

Antennas

Nanoantennas

Ultrafast phenomena

Scanning tunneling microscopy

Electro optics

Lead

Light sources

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