Development of a Nanostructual Microwave Probe Based on GaAs

TL;DR

This paper presents the development of a nanostructural microwave probe based on GaAs substrate, enabling high-resolution electrical property measurements at the nanoscale for materials and devices.

Contribution

A novel GaAs-based nanostructural microwave probe was fabricated using wet etching, overcoming previous resolution limitations in microwave microscopy.

Findings

Successful fabrication of a GaAs microwave probe with nanostructure

The probe demonstrates potential for high-resolution electrical measurements

Wet etching enables precise micro tip formation

Abstract

With the development of nanotechnology, the measurement of electrical properties in local area of materials and devices has become a great need. Although a lot kind of scanning probe microscope have been developed for satisfying the requirement of nanotechnology, a microscope technique which can determine electrical properties in local area of materials and devices is not yet developed. Recently, microwave microscope has been an interest to many researchers, due to its potential in the evaluation of electrical properties of materials and devices. The advance of microwave is that the response of materials is directly relative to the electromagnetic properties of materials. However, because of the problem of the structure of probes, nanometer-scale resolution has not been successful. To achieve the goal, a new structure microwave probe is required. In this paper, we report a nanostructural microwave probe. To restrain the attenuation of microwave in the probe, GaAs was used as the substrate of the probe. To obtain the desired structure, wet etching was used to fabricate the probe. Different with the dry etching, a side-etching will occur under the etching mask. Utilizing this property, a micro tip can be fabricated by etching a wafer, of which a small mask was introduced on the surface in advance.