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A set of periodic and quasi-periodic Au nanoarrays with different morphologies have been fabricated by using electron beam lithography technique, and their optical properties have been examined experimentally and analyzed theoretically by scanning near-field optical microscope and finite element method, respectively. Results present that the localized surface plasmon resonance of the as-prepared Au nanoarrays exhibit the structure-depended characteristics. Comparing with the periodic nanoarrays, the quasi-periodic ones demonstrate stronger electric field enhancement, especially for Thue-Morse nanoarray. Meanwhile, the surface enhanced Raman scattering (SERS) spectra of 4-mercaptobenzoic acid molecular labeled nanoarrays show that the quasi-periodic nanoarrays exhibit distinct SERS enhancement, for example, a higher enhancement factor of ~107 is obtained for the Thue-Morse nanoarray consisted of square pillars of 100nm size. Therefore, it is significant to optimally design and fabricate the chip-scale quasi-periodic nanoarrays with high localized electric field enhancement for SERS applications in biosensing field. [ABSTRACT FROM AUTHOR]

Surface-enhanced Raman scattering (SERS) on a gold triangular nanoprisms array with precisely controlled size and spacing, fabricated via electron beam lithography was investigated. This SERS substrate shows reasonable efficiency at 785 nm excitation for the detection of p-mercaptoaniline (pMA), and a remarkable homogeneity of the SERS response over the sensing area. The performances of the engineered SERS substrate with human prostate cancer cells has been tested, highlighting excellent sensitivity in comparison to spontaneous Raman scattering, especially in the 1500–1700 cm −1 frequency range, characteristic of the peptide linkage and the neighboring functional groups. The results are promising for biosensing applications, provided the selectivity is enhanced by suitable functionalization approaches. [ABSTRACT FROM AUTHOR]

In this work we demonstrate the possibility to realize a novel unconventional ITO-free organic light emitting diode (OLED) utilizing a photonic polymeric electrode. Combining electron beam lithography and a plasma etching process to partially structure the highly conductive poly(3,4 ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) it is possible to realize an embedded photonic crystal (PC) structure. The realized PC-anode drastically reduces the light trapped in the OLED, demonstrating the possibility to eliminate further process stages and making it easier to use this technology even on rollable and flexible substrates. [ABSTRACT FROM AUTHOR]