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Issue 45, 2018
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Near-field digital holography: a tool for plasmon phase imaging

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Abstract

The knowledge of the phase distribution of the near electromagnetic field has become very important for many applications. However, its experimental observation is still technologically a very demanding task. In this work, we propose a novel method for the measurement of the phase distribution of the near electric field based on the principles of phase-shifting digital holography. In contrast to previous methods the holographic interference occurs already in the near field and the phase distribution can be determined purely from the scanning near-field optical microscopy measurements without the need for additional far-field interferometric methods. This opens a way towards on-chip phase imaging. We demonstrate the capabilities of the proposed method by reconstruction of the phase difference between interfering surface plasmon waves and by imaging the phase of a single surface plasmon wave. We also demonstrate a selectivity of the method towards individual components of the field.

Graphical abstract: Near-field digital holography: a tool for plasmon phase imaging

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Article information


Submitted
12 Sep 2018
Accepted
22 Oct 2018
First published
23 Oct 2018

Nanoscale, 2018,10, 21363-21368
Article type
Paper

Near-field digital holography: a tool for plasmon phase imaging

P. Dvořák, M. Kvapil, P. Bouchal, Z. Édes, T. Šamořil, M. Hrtoň, F. Ligmajer, V. Křápek and T. Šikola, Nanoscale, 2018, 10, 21363
DOI: 10.1039/C8NR07438K

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