{"id":2384,"date":"2026-02-17T17:44:40","date_gmt":"2026-02-17T17:44:40","guid":{"rendered":"https:\/\/pmdl.iesl.forth.gr\/?page_id=2384"},"modified":"2026-02-18T14:09:23","modified_gmt":"2026-02-18T14:09:23","slug":"optical-materials","status":"publish","type":"page","link":"https:\/\/pmdl.iesl.forth.gr\/?page_id=2384","title":{"rendered":"Optical Materials"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-page\" data-elementor-id=\"2384\" class=\"elementor elementor-2384\" data-elementor-post-type=\"page\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2b55dff e-flex e-con-boxed e-con e-parent\" data-id=\"2b55dff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d709326 elementor-widget elementor-widget-heading\" data-id=\"d709326\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Optical materials<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ebcf2f3 elementor-widget elementor-widget-text-editor\" data-id=\"ebcf2f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Material research supports progress in photonics where controlled tailoring of mechanical, structural, and photoelastic properties directly governs light propagation, birefringence, and device functionality.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-da7cd97 e-flex e-con-boxed e-con e-parent\" data-id=\"da7cd97\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f02294f elementor-widget elementor-widget-heading\" data-id=\"f02294f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Photo-elasticity of K\u207a Ion-Exchanged Borosilicate Glass <\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-81ce778 e-con-full e-flex e-con e-child\" data-id=\"81ce778\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a724890 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"a724890\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Our recent work investigates the impact of K\u207a ion-exchange on the photoelastic response of borosilicate glass optical fibers, quantified through the Pockels\u2019 coefficients. Using polarization-resolved whispering gallery mode resonances in cylindrical fiber cavities, strain-induced TE\/TM birefringence was experimentally monitored and numerically modeled. The study reveals a ~22% reduction in p\u2081\u1d62 coefficients after 11 h of ion exchange, followed by recovery at longer durations, linking the behavior to structural coordination changes, density variations, and K\u207a polarizability. These results establish ion-exchange as an effective route for tuning glass photoelasticity in fiber-based photonic platforms.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-afe08ff e-con-full e-flex e-con e-child\" data-id=\"afe08ff\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-010ba20 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"010ba20\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"208\" height=\"170\" src=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/6.png\" class=\"attachment-large size-large wp-image-2455\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-484c6bf elementor-widget elementor-widget-text-editor\" data-id=\"484c6bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><em>SEM picture of the cross-section of a cleaved borosilicate glass fiber<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aa66a8c e-flex e-con-boxed e-con e-parent\" data-id=\"aa66a8c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4daf201 elementor-widget elementor-widget-heading\" data-id=\"4daf201\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Bragg Reflector Inscription in Polypropylene No-Core Fibers \n<\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-e0a1f7c e-con-full e-flex e-con e-child\" data-id=\"e0a1f7c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t<div class=\"elementor-element elementor-element-ccd2921 e-con-full e-flex e-con e-child\" data-id=\"ccd2921\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3785d95 elementor-widget__width-initial elementor-widget elementor-widget-image\" data-id=\"3785d95\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"188\" height=\"300\" src=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/7-188x300.png\" class=\"attachment-medium size-medium wp-image-2456\" alt=\"\" srcset=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/7-188x300.png 188w, https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/7.png 213w\" sizes=\"(max-width: 188px) 100vw, 188px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3fa6360 elementor-widget elementor-widget-text-editor\" data-id=\"3fa6360\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p><em>SEM images of a PP fiber<\/em><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-8fca557 e-con-full e-flex e-con e-child\" data-id=\"8fca557\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-93ccdcc elementor-widget elementor-widget-text-editor\" data-id=\"93ccdcc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>For the first time, Bragg reflectors were inscribed in polypropylene (PP) no-core optical fibers using 248 nm KrF excimer laser exposure, enhanced through a novel toluene pre-loading photosensitization method. Toluene in-diffusion enabled threefold stronger reflectors and refractive index modulation on the order of 1.1 \u00d7 10\u207b\u00b3 under identical irradiation conditions. The fabricated gratings exhibited well-defined strain (1.62 pm\/\u00b5\u03b5) and temperature (\u2212145 pm\/\u00b0C) sensitivities, with negligible water-<\/p><p>diffusion response. Our work describes the underlying photosensitivity mechanism, opening new pathways for polymer-based fiber sensing and photonic device engineering.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-75137b9 e-flex e-con-boxed e-con e-parent\" data-id=\"75137b9\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2a061bf elementor-widget elementor-widget-heading\" data-id=\"2a061bf\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">relevant Publications <\/h2>\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3bff166 e-grid e-con-full e-con e-child\" data-id=\"3bff166\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0d1261f elementor-widget elementor-widget-image\" data-id=\"0d1261f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/doi.org\/10.1016\/j.optmat.2025.117392\" target=\"_blank\">\n\t\t\t\t\t\t\t<img decoding=\"async\" width=\"398\" height=\"533\" src=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture701.png\" class=\"attachment-large size-large wp-image-2460\" alt=\"\" srcset=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture701.png 398w, https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture701-224x300.png 224w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-423613e elementor-widget elementor-widget-image\" data-id=\"423613e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/doi.org\/10.1364\/OE.539137\" target=\"_blank\">\n\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"398\" height=\"533\" src=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture705.png\" class=\"attachment-large size-large wp-image-2462\" alt=\"\" srcset=\"https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture705.png 398w, https:\/\/pmdl.iesl.forth.gr\/wp-content\/uploads\/2026\/02\/Picture705-224x300.png 224w\" sizes=\"(max-width: 398px) 100vw, 398px\" \/>\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Optical materials Material research supports progress in photonics where controlled tailoring of mechanical, structural, and photoelastic properties directly governs light [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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