A concise measurement method for optical near field

Abstract

In view of high cost of experiment equipment, complex independent detection for three components of near field and extreme difficulty of phase extraction for optical near-field measurement, one concise method is proposed to acquire optical near-field distribution. Under the condition that the optical field existing both in near and far field, the near field is obtained through the differential and integral calculation of the far-field information in terms of the vector Helmholtz equation. As an exemplification, the near field excited by the Archimedes’ spiral slit is derived from the diffraction far field, which can be easily obtained using the common devices, and the presented spiral phase distributions of optical vortices consistent with the theoretical prediction confirm the effectiveness of the proposed method. This method realizes independent detection for three components of near field and fulfills the acquirement of near-field phase information without any complex and costly device, and it has the advantages of low cost, high efficiency and environmental independence. This method may pave one promising way for optical near-field detection.

Keywords

near-field measurement / nanostructure / optical vortex / Archimedes’ spiral

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Higher Education Press 2026

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