Browsing by Author "Ayas S."

Now showing items 1-15 of 15

    • All-aluminum hierarchical plasmonic surfaces in the infrared 

      Ayas S.; Bakan, G.; Dana, A. (The Optical Society, 2016)
      All-Aluminum metal-insulator-metal resonator structures withmultiple metal-insulator stacks showing resonances in the mid-infrared(MIR) are fabricated. Ultrathin native Al2O3 is used as the insulator layersenabling simple ...

    • Colorimetric detection of ultrathin dielectrics on strong interference coatings 

      Ayas S.; Bakan, G.; Ozgur E.; Celebi, K.; Torunoglu, G.; Dana, A. (OSA - The Optical Society, 2018)
      Metal films covered with ultrathin lossy dielectrics can exhibit strong interference effects manifested as the broad absorption of the incident light resulting in distinct surface colors. Despite their simple bilayer ...

    • Counting molecules with a mobile phone camera using plasmonic enhancement 

      Ayas S.; Cupallari, A.; Ekiz, O. O.; Kaya, Y.; Dana, A. (American Chemical Society, 2014)
      Plasmonic field enhancement enables the acquisition of Raman spectra at a single molecule level. Here we investigate the detection of surface enhanced Raman signal using the unmodified image sensor of a smart phone, ...

    • Exploiting native Al2O3 for multispectral aluminum plasmonics 

      Ayas S.; Topal, A. E.; Cupallari, A.; Güner, H.; Bakan, G.; Dana, A. (American Chemical Society, 2014)
      Aluminum, despite its abundance and low cost, is usually avoided for plasmonic applications due to losses in visible/infrared regimes and its interband absorption at 800 nm. Yet, it is compatible with silicon CMOS processes, ...

    • Grating coupler integrated photodiodes for plasmon resonance based sensing 

      Turker, B.; Guner, H.; Ayas S.; Ekiz, O. O.; Acar, H.; Güler, Mustafa O.; Dâna, A. (Royal Society of Chemistry, 2011)
      In this work, we demonstrate an integrated sensor combining a grating-coupled plasmon resonance surface with a planar photodiode. Plasmon enhanced transmission is employed as a sensitive refractive index (RI) sensing ...

    • Invisible thin-film patterns with strong infrared emission as an optical security feature 

      Bakan, G.; Ayas S.; Serhatlioglu, M.; Elbuken, Çağlar; Dana, A. (Wiley-VCH Verlag, 2018)
      Spectrally selective thermal emission is in high demand for thermophotovoltaics, radiative cooling, and infrared sensing applications. Spectral control of the emissivity is historically achieved by choosing the material ...

    • Perfectly absorbing ultra thin interference coatings for hydrogen sensing 

      Serhatlioglu, M.; Ayas S.; Bıyıklı, Necmi; Dana, A.; Solmaz, M. E. (OSA - The Optical Society, 2016)
      Here we numerically demonstrate a straightforward method for optical detection of hydrogen gas by means of absorption reduction and colorimetric indication. A perfectly absorbing metal-insulator-metal (MIM) thin film ...

    • Probing hot-electron effects in wide area plasmonic surfaces using X-ray photoelectron spectroscopy 

      Ayas S.; Cupallari, A.; Dana, A. (American Institute of Physics Inc., 2014)
      Plasmon enhanced hot carrier formation in metallic nanostructures increasingly attracts attention due to potential applications in photodetection, photocatalysis, and solar energy conversion. Here, hot-electron effects in ...

    • Raman enhancement on a broadband meta-surface 

      Ayas S.; Güner, H.; Türker, B.; Ekiz, O. O.; Dirisaglik, F.; Okyay, Ali Kemal; Dâna, A. (American Chemical Society, 2012-07-30)
      Plasmonic metamaterials allow confinement of light to deep subwavelength dimensions, while allowing for the tailoring of dispersion and electromagnetic mode density to enhance specific photonic properties. Optical resonances ...

    • Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers 

      Ayas S.; Bakan, G.; Dana, A. (OSA - The Optical Society, 2015)
      Multispectral metamaterial absorbers based on metal-insulatormetal nano-square patch resonators are studied here. For a geometry consisting of perfectly nano-square patches and vertical sidewalls, double resonances in the ...

    • Sensitivity comparison of localized plasmon resonance structures and prism coupler 

      Kaya, Y.; Ayas S.; Topal, A. E.; Guner, H.; Dana, A. (2014)
      Plasmon resonances are widely used in biomolecular sensing and continue to be an active research field due to the rich variety of surface and measurement configurations, some of which exhibit down to single molecule level ...

    • Surface enhanced Raman spectroscopy of unilamellar liposomes loaded with silver nanoparticles 

      Toren, P.; Tekinay, T.; Ayas S.; Dana, A.; Tunc, I. (American Scientific Publishers, 2017)
      Imaging organic molecules using surface-enhanced Raman spectroscopy (SERS) has drawn attention due to its non-invasive nature and label-free approach. The SERS approach can be used in tracking organic molecules and monitoring ...

    • Thermally tunable ultrasensitive infrared absorption spectroscopy platforms based on thin phase-change films 

      Bakan, G.; Ayas S.; Ozgur E.; Celebi, K.; Dana, A. (American Chemical Society, 2016-11)
      The thermal tunability of the optical and electrical properties of phase-change materials has enabled the decades-old rewritable optical data storage and the recently commercialized phase-change memory devices. Recently, ...

    • Ultrathin phase-change coatings on metals for electrothermally tunable colors 

      Bakan, G.; Ayas S.; Saidzoda, T.; Celebi, K.; Dana, A. (American Institute of Physics Inc., 2016-08)
      Metal surfaces coated with ultrathin lossy dielectrics enable color generation through strong interferences in the visible spectrum. Using a phase-change thin film as the coating layer offers tuning the generated color by ...

    • Universal infrared absorption spectroscopy using uniform electromagnetic enhancement 

      Ayas S.; Bakan, G.; Ozgur E.; Celebi, K.; Dana, A. (American Chemical Society, 2016)
      Infrared absorption spectroscopy has greatly benefited from the electromagnetic field enhancement offered by plasmonic surfaces. However, because of the localized nature of plasmonic fields, such field enhancements are ...