title: Plasmonic quasicrystals with broadband transmission enhancement.
abstract: Plasmonic quasicrystals (PlQCs), by integrating the properties of quasicrystals (rotational symmetry and long range ordering but lack translational symmetry) and surface plasmon polariton mediated effects, offer several advantages over plasmonic crystals (PlCs). For example, in PlQCs one could have broadband, polarization independent response. However, large area patterning by electron beam lithography requires precise lattice coordinates as well as a practical way to design the structures for specific spectral response. We demonstrate design and fabrication of large area quasicrystal air hole patterns of π/5 symmetry in metal film in which broadband, polarization and launch angle independent transmission enhancement is observed. We demonstrate bi-grating quasicrystals to show that designable transmission response is possible over visible to near infrared wavelength regions with about 15 times enhancement. These would be useful in many applications like energy harvesting, nonlinear optics and quantum plasmonics.
authors.affiliation: 1] DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA [2].
authors.forename: Sachin
authors.initials: S
authors.lastname: Kasture
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: Ajith P
authors.initials: AP
authors.lastname: Ravishankar
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: V J
authors.initials: VJ
authors.lastname: Yallapragada
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: Raj
authors.initials: R
authors.lastname: Patil
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: Nikesh V
authors.initials: NV
authors.lastname: Valappil
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: Gajendra
authors.initials: G
authors.lastname: Mulay
authors.affiliation: DCMPMS, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005 INDIA.
authors.forename: Venu Gopal
authors.initials: VG
authors.lastname: Achanta