Now showing items 1-8 of 8

    • Design strategies for ratiometric chemosensors: modulation of excitation energy transfer at the energy donor site 

      Guliyev, R.; Coskun, A.; Akkaya, E. U. (2009)
      Excitation energy transfer, when coupled to an ion-modulated ICT chromophore, creates novel opportunities in sensing. The direction of energy transfer and the point of ICT modulation can be varied as desired. In our previous ...
    • Dynamic tuning of plasmon resonance in the visible using graphene 

      Balci, S.; Balci, O.; Kakenov, N.; Atar, F. B.; Kocabas, C. (The Optical Society, 2016)
      We report active electrical tuning of plasmon resonance of silver nanoprisms (Ag NPs) in the visible spectrum. Ag NPs are placed in close proximity to graphene which leads to additional tunable loss for the plasmon resonance. ...
    • Flame detection for video-based early fire warning for the protection of cultural heritage 

      Dimitropoulos, K.; Günay, Osman; Köse, Kıvanç; Erden, Fatih; Chaabene, F.; Tsalakanidou, F.; Grammalidis, N.; Çetin, Enis (2012-10-11)
      Cultural heritage and archaeological sites are exposed to the risk of fire and early warning is the only way to avoid losses and damages. The use of terrestrial systems, typically based on video cameras, is currently the ...
    • Graphene-based optical modulators 

      Balci S.; Kocabas, C. (World Scientific Publishing Co. Pte. Ltd., 2017)
      In this chapter, we summarize the recent progress on graphene based optical modulators. Ability to control density of high mobility electrons on large area graphene surface enables realization of new type of electrooptical ...
    • Graphene-enabled optoelectronics on paper 

      Polat, E. O.; Uzlu, H. B.; Balci, O.; Kakenov, N.; Kovalska, E.; Kocabas, C. (American Chemical Society, 2016-06)
      The realization of optoelectronic devices on paper has been an outstanding challenge due to the large surface roughness and incompatible nature of paper with optical materials. Here, we demonstrate a new class of optoelectronic ...
    • Plasmonic absorbers for multispectral and broadband absorption 

      Ayaş, Sencer; Güner, Hasan; Türker, Burak; Ekiz, Öner; Dana, Aykutlu (SPIE, 2012)
      We present polarization dependent multispectral and broadband plasmonic absorbers in the visible spectrum. The spectral characteristics of these structures are tunable over a broad spectrum. Experimental results are verified ...
    • A plasmonic enhanced photodetector based on silicon nanocrystals obtained through laser ablation 

      Alkis, S.; Oruç, F. B.; Ortaç, B.; Koşger, A. C.; Okyay, Ali Kemal (Institute of Physics Publishing, 2012-10-18)
      We present a proof-of-concept photodetector which is sensitive in the visible spectrum. Silicon nanocrystals (Si-NCs) obtained by laser ablation are used as the active absorption region. Si-NC films are formed from a ...
    • Plasmonically enhanced ZnO thin-film-photo-transistor with dynamic responsivity control 

      Özcan, Ayşe; Battal, Enes; Atar, Fatih Bilge; Okyay, Ali Kemal (IEEE, 2013)
      We fabricated an ZnO based thin-film photo-transistor with electrically tunable photo-responsivity operating in the UV and visible spectra and designed plasmonic structures enhancing the device performance up to 6 folds ...