Artifact-free data recovery system for an ASNOM application

TL;DR

This paper introduces a digital signal processing system for ASNOM that accurately recovers near-field electromagnetic interactions by leveraging non-linear signal dependencies and modular algorithms, enhancing data acquisition and analysis.

Contribution

It presents a novel DSP-based system for ASNOM that improves artifact-free data recovery through advanced signal processing and flexible modular design.

Findings

Effective recovery of near-field electromagnetic signals

Modular system allows easy modification of recovery algorithms

Enhanced artifact-free data acquisition in ASNOM

Abstract

A digital signal acquisition system for an Apertureless SNOM (ASNOM) based on a digital signal processing (DSP) card is presented. An electromagnetic wave scattered by an AFM-like tip is initially detected by an optical homodyning in a Michelson interferometer, with a homodyne phase modulation caused by a periodic travel of the reference arm mirror. Utilizing a non-linear dependency of the tip scattering amplitude on a tip-sample separation distance, the non-fundamental components of a tip oscillation frequency are recovered in optical signal within each tip oscillation period. A detected value, corresponding mostly to the near-field modes of a tip-sample electromagnetic interaction, is then averaged over all reference phases. A modular structure of the data acquisition and signal recovery program allows modify easily the modes of operation and the recovery algorithms.