Analysis of Fresnel Zone Plates Focusing Dependence on Operating Frequency

Authors :: Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions
Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
Ministerio de Economía, Industria y Competitividad
Fuster Escuder, José Miguel
Candelas Valiente, Pilar
Castiñeira Ibáñez, Sergio
Pérez López, Sergio
Rubio Michavila, Constanza
Universitat Politècnica de València. Departamento de Comunicaciones - Departament de Comunicacions
Universitat Politècnica de València. Departamento de Física Aplicada - Departament de Física Aplicada
Ministerio de Economía, Industria y Competitividad
Fuster Escuder, José Miguel
Candelas Valiente, Pilar
Castiñeira Ibáñez, Sergio
Pérez López, Sergio
Rubio Michavila, Constanza
Publication Year :: 2017
Abstract: [EN] The focusing properties of Fresnel Zone Plates (FZPs) against frequency are analyzed in this work. It is shown that the FZP focal length depends almost linearly on the operating frequency. Focal depth and focal distortion are also considered, establishing a limit on the frequency span at which the operating frequency can be shifted. An underwater FZP ultrasound focusing system is demonstrated, and experimental results agree with the theoretical analysis and simulations.

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