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Updated: Jun 24, 2026

A Technical Guide for Performing Spectroscopic Measurements on Metal-Organic Frameworks
Published on: April 28, 2023
Optical properties of metal tips for tip-enhanced spectroscopies
Maxim Sukharev1, Tamar Seideman
1Chemistry, Physics, and Applied Mathematics, Arizona State University at the Polytechnic Campus, 6073 S. Backus Mall, Mesa, Arizona 85212, USA. maxim.sukharev@asu.edu
Abstract:
We develop a full 3D approach to simulate the optical properties of sharp metal tips that could be quantitatively compared with experiments and provide accurate predictions. Similar to metallic wires, elongated metal tips support a series of extended mode resonances whose properties are largely determined by the tip geometry and are essentially independent of the tip material. For sufficiently long tips, these resonances are energetically well separated from a broader, high-energy feature, whose position and line shape are independent of the tip length but vary strongly with the tip material. The latter is a localized plasmon mode characterized by the hemisphere terminating the tip.
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