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Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers

[Image: see text] Solid phononic crystal (PnC) lenses were made active on infiltration with thermosensitive polymers to produce a thermoactuated hybrid solid lens with variable focusing. Acoustic lenses, both solid state and PnCbased, are passive elements with a fixed focal length. Their focal chara...

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Autores principales: Walker, Ezekiel L., Reyes-Contreras, Delfino, Jin, Yuqi, Neogi, Arup
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788038/
https://www.ncbi.nlm.nih.gov/pubmed/31616839
http://dx.doi.org/10.1021/acsomega.9b02374
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author Walker, Ezekiel L.
Reyes-Contreras, Delfino
Jin, Yuqi
Neogi, Arup
author_facet Walker, Ezekiel L.
Reyes-Contreras, Delfino
Jin, Yuqi
Neogi, Arup
author_sort Walker, Ezekiel L.
collection PubMed
description [Image: see text] Solid phononic crystal (PnC) lenses were made active on infiltration with thermosensitive polymers to produce a thermoactuated hybrid solid lens with variable focusing. Acoustic lenses, both solid state and PnCbased, are passive elements with a fixed focal length. Their focal characteristics are functions of the lens structure or the arrangement of the PnC unit cell. Dispersion effects, liquid-filled membranes, and phase delay in a multi-element emitter have been used for variable focusing. The high thermal, electric, and electromagnetic sensitivity of the elastic properties of poly(vinyl alcohol) (PVA) poly(N-isopropylacrylamide) (PNIPAm)-based hydrogels enable them to operate as tunable solids. However, these solids do not have strong enough contrast with water or well-controlled shape parameters to function as standalone lenses. Here, a tunable hybrid solid ultrasonic lens is realized by combining a PnC lens with PVA-PNIPAm thermoacoustic hydrogel to modify the transmission and dispersion properties of transient acoustic waves. Variable focusing is demonstrated from 40 to 50 mm using the anomalous thermosensitivity of the elasticity and speed of sound of the hydrogel.
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spelling pubmed-67880382019-10-15 Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers Walker, Ezekiel L. Reyes-Contreras, Delfino Jin, Yuqi Neogi, Arup ACS Omega [Image: see text] Solid phononic crystal (PnC) lenses were made active on infiltration with thermosensitive polymers to produce a thermoactuated hybrid solid lens with variable focusing. Acoustic lenses, both solid state and PnCbased, are passive elements with a fixed focal length. Their focal characteristics are functions of the lens structure or the arrangement of the PnC unit cell. Dispersion effects, liquid-filled membranes, and phase delay in a multi-element emitter have been used for variable focusing. The high thermal, electric, and electromagnetic sensitivity of the elastic properties of poly(vinyl alcohol) (PVA) poly(N-isopropylacrylamide) (PNIPAm)-based hydrogels enable them to operate as tunable solids. However, these solids do not have strong enough contrast with water or well-controlled shape parameters to function as standalone lenses. Here, a tunable hybrid solid ultrasonic lens is realized by combining a PnC lens with PVA-PNIPAm thermoacoustic hydrogel to modify the transmission and dispersion properties of transient acoustic waves. Variable focusing is demonstrated from 40 to 50 mm using the anomalous thermosensitivity of the elasticity and speed of sound of the hydrogel. American Chemical Society 2019-09-30 /pmc/articles/PMC6788038/ /pubmed/31616839 http://dx.doi.org/10.1021/acsomega.9b02374 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Walker, Ezekiel L.
Reyes-Contreras, Delfino
Jin, Yuqi
Neogi, Arup
Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title_full Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title_fullStr Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title_full_unstemmed Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title_short Tunable Hybrid Phononic Crystal Lens Using Thermo-Acoustic Polymers
title_sort tunable hybrid phononic crystal lens using thermo-acoustic polymers
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6788038/
https://www.ncbi.nlm.nih.gov/pubmed/31616839
http://dx.doi.org/10.1021/acsomega.9b02374
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