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Large scale indium tin oxide grating.pdf (1.79 MB)
Large Scale Indium Tin Oxide (ITO) One Dimensional Gratings for Ultrafast Signal Modulation in the Visible
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revised on 25.10.2019 and posted on 25.10.2019by Michele Guizzardi, Silvio Bonfadini, Liliana Moscardi, Ilka Kriegel, Francesco Scotognella, Luigino Criante
We present a photophysical study on an indium tin oxide (ITO) one
dimensional grating, realized using femtosecond micromachining technology, a
technology very industrially accessible. The geometries, dimensions and pitch
of the various gratings analyzed are obtained by means of direct ablation in a
controlled atmosphere of a homogeneous thin layer of ITO deposited on a glass
substrate. The pitch has been selected in order to obtain a higher order of the
photonic band gap in the visible. By
means of ultrafast pump-probe spectroscopy we characterize both the plasmon and
inter-band temporal dynamics. We observe a large optical non-linearity of ITO
grating in the visible range, where the photonic band gap occurs, when pumped
at the surface plasmon resonance in the near infrared (1500 nm). All together
we show the possibility of all-optical signal modulation with heavily doped
semiconductors in their transparency window with a picosecond response time
through the formation of ITO grating structures.