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Choi, SooBong,Park, DooJae,Lienau, C.,Jeong, Mun Seok,Byeon, Clare C.,Ko, Do-Kyeong,Kim, D. S. The Optical Society 2008 Optics express Vol.16 No.16
<P>We demonstrate spatial control of optical near-fields by femtosecond phase shaping in one-dimensional plasmonic structures. The near-field images display striking temporal-phase dependence, switching between double- and single-peak images within one lattice constant. The change of the near-field distribution is studied in the time and spectral domain. The spectral composition change observed by varying the time delay between two phase-locked femtosecond pulses explains the spatial control of the near-field images. Modal expansion calculations of linear light transmission using the surface impedance boundary condition are in excellent agreement with experiments.</P>
홍성철,박규환,Ch. Lienau,김대식,J. Kim,J. W. Park,K. H. Yoo,. H. Han,V. Malyarchuk,Y. C. Yoon 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
We study emission patterns in periodic nano-hole arrays perforated in a metal film. In the nearfield region, higher order multiple components of diffraction interfere with each other to generate complicated spatial patterns. These patterns simplify to a sinusoidal one in the intermediate region and become either homogeneous or sinusoidal in the far-field region, depending on whether the excitation wavelength is larger or smaller than the lattice constant. For an incident wavelength much smaller than the lattice constant, complicated patterns can survive into the far-field. Detailed analytic and numerical studies are presented, which show good qualitative agreement with experiment.
Light transmission in nanostructures
D. S. Kim,Q-H. Park,S.H. Han,Ch. Lienau 한국진공학회(ASCT) 2003 Applied Science and Convergence Technology Vol.12 No.S1
We investigate transmission of light in nanoscale structures. We present spatial and temporal domain measurements of the dephasing of surface plasmon excitations in metal films with periodic nano-hole arrays. By probing coherent spatial SP propagation lengths of a few μ m and an ultrafast decay of the SP polarization on a 10 fs timescale, we demonstrate that the SP transmission peaks are homogeneously broadened by the SP radiative lifetime. The pronounced wavelength and hole size dependence of the dephasing rate shows that the microscopic origin of the conversion of SP into light is a Rayleigh-like scattering by the periodic hole array. We have experimentally studied the dephasing of surface plasmon excitations in metallic nano-hole arrays. By relating nanoscopic SP propagation, ultrafast light transmission and optical spectra, we demonstrate that the transmission spectra of these plasmonic bandgap structures are homogeneously broadened. The spectral line shape and dephasing time are dominated by Rayleigh scattering of SP into light and can varied over a wide range by controlling the resonance energy and/or hole radius. This opens the way towards designing SP nano-optic devices and spatially and spectrally tailoring light-matter interactions on nanometer length scales.
Kim, D. S.,Yoon, Y. C.,Hohng, S. C.,Malyarchuk, V.,Lienau, Ch.,Park, J. W.,Kim, J. H.,Park, Q. H. Optical Society of Korea 2002 Current Optics and Photonics Vol.6 No.3
Nanoscopic emission from periodic nano-hole arrays in thick metal films is studied experimentally. The experiments give direct evidence for SP excitations in such structures. We show that the symmetry of the emission is governed by polarization and its shape is defined the interference of SP waves of different diffraction orders. Near-Held pattern analysis combined with the far-Held reflection and transmission measurements suggests that the SP eigenmodes of these arrays may be understood as those of ionic plasmon molecules.
Adiabatic Nanofocusing Scattering-Type Optical Nanoscopy of Individual Gold Nanoparticles
Sadiq, Diyar,Shirdel, Javid,Lee, Jae Sung,Selishcheva, Elena,Park, Namkyoo,Lienau, Christoph American Chemical Society 2011 NANO LETTERS Vol.11 No.4
<P>We explore imaging of local electromagnetic fields in the vicinity of metallic nanoparticles using a grating-coupled scattering-type near-field scanning optical microscope. In this microscope, propagating surface plasmon polariton wavepackets are launched onto smooth gold tapers where they are adiabatically focused toward the nanometer-sized taper apex. We report two-dimensional raster-scanned optical images showing pronounced near-field contrast and demonstrating sub-30 nm resolution imaging of localized surface plasmon polariton fields of spherical and elliptical nanoparticles. By comparison to three-dimensional finite-difference time domain simulations, we conclude that virtually background-free near-field imaging is achieved. The microscope combines deep subwavelength resolution, high local field intensities and a straightforward imaging contrast, making it interesting for a variety of applications in linear and nonlinear nanospectroscopy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-4/nl1045457/production/images/medium/nl-2010-045457_0006.gif'></P>
Low-temperature Near-field Scanning Optical Microscope for UV-visible Spectroscopy of Nanostructures
정문석,임상엽,김종수,Yong Hwan Kim,,Ok-Hwan Cha,박두재,최수봉,김대식,Ch. Lienau,변지수 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.3
A low-temperature near-field scanning optical microscope (LT-NSOM) is designed and realized in order to study the optical properties of nanostructures at cryogenic temperatures in the UV-visible wavelength range. Due to the simple and extensive optical design, any type of NSOM operation mode is accessible. In particular, the localized photoluminescence spectra of nanostructures can be measured at temperatures from 13 K up to 300 K. We successfully demonstrate the performance of our LT-NSOM by investigating InGaN/GaN multiple quantum wells grown on a sapphire substrate at 15 K.