Impedance Matching in Optically Induced Dielectrophoresis: Effect of Medium Conductivity on Trapping Force

Overview

Journal Appl Phys Lett

Date 2024 Aug 5

PMID 39100735

Authors

Mohammad Asif Zaman

Mo Wu

Wei Ren

Lambertus Hesselink

Affiliations

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Abstract

An impedance analysis for optically induced dielectrophoresis is presented. A circuit model is developed for this purpose. The model parameters are fully defined in terms of the geometrical and material properties of the system. It is shown that trapping force can only be generated when the material properties follow certain impedance matching conditions. The factor is introduced to succinctly quantify the phenomenon. It is used to calculate bounds on the allowed electrical conductivity of the suspension medium. Results from the proposed model are found to be in good agreement with full-wave numerical simulations. By computing the acceptable set of material parameters with little computational cost, the presented analysis can streamline ODEP system design for various applications.

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