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Permanent URI for this collectionhttps://hdl.handle.net/20.500.14288/3

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    Optical sensors based on palladium and polymer-coated optical fiber resonators
    (Spie-Int Soc Optical Engineering, 2019) Eryürek, Mustafa; N/A; Department of Physics; Department of Chemistry; Department of Chemistry; Department of Physics; Bavili, Nima; Morova, Berna; Yılgör, İskender; Yılgör, Emel; Kiraz, Alper; PhD Student; Researcher; Faculty Member; Researcher; Faculty Member; Department of Chemistry; Department of Physics; Koç University Research Center for Translational Medicine (KUTTAM) / Koç Üniversitesi Translasyonel Tıp Araştırma Merkezi (KUTTAM); N/A; College of Science; College of Sciences; College of Sciences; College of Sciences; N/A; 152935; 24181; N/A; 22542
    In this work, we present robust and easy-to-fabricate optical gas and vapor sensors based on optical fiber resonators (OFR) coated with palladium (Pd) thin films, Pd micro-particles and polymer brushes (PB). Pd based sensors are used for hydrogen (H-2) gas detection in concentration range of 0% to 1% and polymer brush-coated OFR are used for detection of vapor in concentration range of 0 to 25%. Sensing mechanism of these sensors is based on spectral shift of resonance wavelength which are called whispering gallery modes (WGMs). This spectral shift is due to volume expansion of the sensing material. Tapered fiber is used in order to excite WGMs in coated OFRs. Good sensitivity and repeatability results are obtained for all three types of sensors.
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    Influence of active ion concentration on fluorescence efficiency and lasing performance in Cr2+: ZnSe lasers
    (IEEE, 2005) N/A; Department of Physics; Department of Physics; Department of Chemistry; Demirbaş, Ümit; Sennaroğlu, Alphan; Kurt, Adnan; Somer, Mehmet Suat; Master Student; Faculty Member; Teaching Faculty; Faculty Member; Department of Physics; Department of Chemistry; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; College of Sciences; 20328; 23851; 194455; 178882
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    All-protein 3D coffee stain lasers
    (Optica Publishing Group (formerly OSA), 2018) N/A; N/A; Department of Electrical and Electronics Engineering; N/A; N/A; N/A; Department of Molecular Biology and Genetics; Department of Chemistry; Department of Chemistry; Department of Electrical and Electronics Engineering; Doğru-Yüksel, Itır Bakış; Söz, Çağla Koşak; Press, Daniel Aaron; Melikov, Rustamzhon; Begar, Efe; Çonkar, Deniz; Karalar, Elif Nur Fırat; Yılgör, Emel; Yılgör, İskender; Nizamoğlu, Sedat; PhD Student; PhD Student; Researcher; PhD Student; PhD Student; PhD Student; Faculty Member; Researcher; Faculty Member; Faculty Member; Department of Molecular Biology and Genetics; Department of Chemistry; Department of Electrical and Electronics Engineering; N/A; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); N/A; N/A; N/A; N/A; N/A; N/A; Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Koç University Surface Science and Technology Center (KUYTAM) / Koç Üniversitesi Yüzey Teknolojileri Araştırmaları Merkezi (KUYTAM); Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; College of Sciences; College of Sciences; College of Engineering; N/A; N/A; N/A; N/A; N/A; N/A; 206349; N/A; 24181; 130295
    The transition from a 2D to a 3D coffee stain that has a well-defined and hollow spherelike structure is demonstrated. Self-assembled all-protein lasers are constructed by 3D coffee stains.