Near-field digital holography: a tool for plasmon phase imaging. Issue 45 (14th November 2018)

• Record Type: Journal Article
• Authors: Dvořák, Petr; Kvapil, Michal; Bouchal, Petr; Édes, Zoltán; Šamořil, Tomáš; Hrtoň, Martin; Ligmajer, Filip; Křápek, Vlastimil; Šikola, Tomáš
• Is Part Of: Nanoscale. Volume 10:Issue 45(2018)
• Page Start: 21363
• Page End: 21368
• Publication Date: 2018-11-14
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr07438k
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : The knowledge of the phase distribution of the near electromagnetic field has become very important for many applications. 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.