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Optical Antennas

Nano antenna optimized for near field enhancement. Image by Andre Hildebrandt.

We design antennas on the nano- and micro-scale that allow steering the light either to desired directions or to drastically enhance fields locally.

Next topic: Metamaterials

Related publications by the TET group


Open list in Research Information System

Directional Emission from Dielectric Leaky-Wave Nanoantennas

M. Peter, A. Hildebrandt, C. Schlickriede, K. Gharib, T. Zentgraf, J. Förstner, S. Linden, Nano Letters (2017), 17(7), pp. 4178-4183


Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas

H. Linnenbank, Y. Grynko, J. Förstner, S. Linden, Light: Science & Applications (2016), 5(1)


Engineering plasmonic and dielectric directional nanoantennas

A. Hildebrandt, M. Reichelt, T. Meier, J. Förstner, in: Ultrafast Phenomena and Nanophotonics XVIII, SPIE, 2014, pp. 89841G-8941G-6

Optical and infrared antennas provide a promising way to couple photons in and out of nanoscale structures. As counterpart to conventional radio antennas, they are able to increase optical felds in sub-wavelength volumes, to enhance excitation and emission of quantum emitters or to direct light, radiated by quantum emitters. The directed emission of these antennas has been mainly pursued by surface plasmon based devices, e.g. Yagi-Uda like antennas, which are rather complicated due to the coupling of several metallic particles. Also, like all metallic structures in optical or infrared regime, these devices are very sensitive to fabrication tolerances and are affected by strong losses. It has been shown recently, that such directed emission can be accomplished by dielectric materials as well. In this paper we present an optimization of nanoscopic antennas in the near infrared regime starting from a metallic Yagi-Uda structure. The optimization is done via a particle-swarm algorithm, using full time domain finite integration simulations to obtain the characteristics of the investigated structure, also taking into account substrates. Furthermore we present a dielectric antenna, which performs even better, due to the lack of losses by an appropriate choice of the dielectric material. These antennas are robust concerning fabrication tolerances and can be realized with different materials for both the antenna and the substrate, without using high index materials.


    Open list in Research Information System

    Funding, co-operations

    Contact

    Farheen Henna

    Theoretical Electrical Engineering

    Farheen Henna
    Phone:
    +49 5251 60-3056
    Office:
    P1.5.02.1

    Office hours:

    Mondays, 9:30 - 10.30 a.m. 

    Dr. Viktor Myroshnychenko

    Theoretical Electrical Engineering

    Viktor Myroshnychenko
    Phone:
    +49 5251 60-3014
    Fax:
    +49 5251 60-3524
    Office:
    P 1.5.17.2

    Office hours:

    On Tuesdays: 13:00-14:00

    Head of the group

    Prof. Dr. Jens Förstner

    Theoretical Electrical Engineering

    Jens Förstner
    Phone:
    +49 5251 60-3013
    Fax:
    +49 5251 60-3524
    Office:
    P1.5.01.1

    Office hours:

    on request (during lecture break)

    The University for the Information Society