Surface-plasmon-induced light absorption on a rough silver surface

Kim, Sun Kyung; Ee, Ho Seok; Choi, Wonyong; Kwon, Soon-Hong; Kang, Ju Hyung; Kim, Yoon Ho; Kwon, Hansang; Park, Hong Gyu

doi:10.1063/1.3537812

Cited by 70 publications

(41 citation statements)

References 17 publications

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“…3C). This result is diagnostic of the presence of surface plasmon polaritons, which are excited by interaction of the incident plane wave with the periodic grooves of the CBG (23,24). Together, simulation and theory not only reconstitute the essential features of the scatter profiles measured in Fig.…”

Section: Significancementioning

confidence: 58%

High-throughput patterning of photonic structures with tunable periodicity

Kempa

Bediako

Kim

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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A patterning method termed "RIPPLE" (reactive interface patterning promoted by lithographic electrochemistry) is applied to the fabrication of arrays of dielectric and metallic optical elements. This method uses cyclic voltammetry to impart patterns onto the working electrode of a standard three-electrode electrochemical setup. Using this technique and a template stripping process, periodic arrays of Ag circular Bragg gratings are patterned in a highthroughput fashion over large substrate areas. By varying the scan rate of the cyclically applied voltage ramps, the periodicity of the gratings can be tuned in situ over micrometer and submicrometer length scales. Characterization of the periodic arrays of periodic gratings identified point-like and annular scattering modes at different planes above the structured surface. Facile, reliable, and rapid patterning techniques like RIPPLE may enable the highthroughput and low-cost fabrication of photonic elements and metasurfaces for energy conversion and sensing applications.evelopments in photonics and plasmonics have provided a rich array of approaches for coupling and guiding light (1-5) in optoelectronic and energy applications. The structured surfaces required for photon management would ideally feature: (i) submicrometer to nanoscale feature size, (ii) precise control of feature size and periodicity over a broad range of length scales, (iii) structures that can be formed over reasonably large substrate areas, and (iv) the capacity to integrate metal and dielectric structures with various substrate geometries. To date, the fabrication of nanoscale and submicrometer structures has relied on a rich repertoire of patterning and assembly techniques (6-15). Aside from well-established techniques such as photolithography, electron-beam lithography, and focused ion beam (6), more recent patterning and assembly methods include directed and selfassembly (7-9), superlattice nanowire pattern transfer (10), dip-pen lithography (11-13), soft-lithography (14), and electrochemical lithography (15). Among these strategies there are the expected trade-offs between fidelity and resolution. In addition, patterning speed, scalability, and the cost/ease of implementation are important factors affecting the feasibility of a given method toward preparing structured surfaces for optical management.Reactive interface patterning promoted by lithographic electrochemistry (RIPPLE) is a method to form and propagate periodically spaced submicrometer structures over large areas. We demonstrate the ability of the method to pattern optical elements with facility while maintaining control over fidelity and resolution to allow for the fabrication of arrays of dielectric and metallic optical elements. Photonic elements consisting of Ag circular Bragg gratings and large-area periodic arrays of these periodically structured elements were prepared and characterized. The ability to pattern complex submicrometer structures over large areas in a facile, reliable, and timely manner has significant implicati...

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Section: Significancementioning

confidence: 58%

High-throughput patterning of photonic structures with tunable periodicity

Kempa

Bediako

Kim

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…2(c) that the local excitation of SPPs at the roughened surface patterns (several bright spots at the bottom surface) leads to distortion of the field profile. Such field concentration at a metallic nanometer-sized structure can cause a qualitative deterioration of the plasmonic mode and significant optical absorption, as the rms height of the surface roughness is large [12]. In contrast, the TE-like monopole optical mode excited inside the InP nanodisk does not show significant distortion of the field profile, despite the increased rms height of the bottom surface roughness in the nanopan.…”

Section: Simulation Resultsmentioning

confidence: 94%

“…Recent studies of plasmonic lasers/cavities show that their quality (Q) factors can be increased further through rational cavity design, while keeping the mode volumes extremely small [1][2][3]. In addition, these optical properties of plasmonic structures significantly depend on the surface roughness of the dielectric-metal interface at which SPPs are excited, and thus it is very important to fabricate a metallic structure with an ultrasmooth surface [12,13]. The typical roughness of deposited silver or gold is a few nanometers; one of the smallest roughnesses was reported as 0.59 nm [1].…”

Section: Introductionmentioning

confidence: 99%

Dependence of Q Factor on Surface Roughness in a Plasmonic Cavity

Kim

Kwon

et al. 2016

Journal of the Optical Society of Korea

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We investigated surface-roughness-dependent optical loss in a plasmonic cavity consisting of a semiconductor nanodisk/silver nanopan structure. Numerical simulations show that the quality factors of plasmonic resonant modes significantly depend on the surface roughness of the dielectric-metal interface in the cavity structure. In the transverse-magnetic-like whispering-gallery plasmonic mode excited in a structure with disk diameter of 1000 nm, the total quality factor decreased from 260 to 130 with increasing root-mean-square (rms) surface roughness from 0 to 5 nm. This quantitative theoretical study shows that the smooth metal surface plays a critical role in high-performance plasmonic devices.

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“…Previous studies have shown that the nanoscale surface roughness and thickness of the metal film can greatly affect the light absorption and the excitation of LSPs on roughened metal surfaces can enable strong light absorption enhancement. [31][32][33][34] Therefore, the effects of the thickness and surface roughness of the titanium film used in the fiber optic microheater on the formation and growth of vapor bubbles should be characterized. We first conducted open environment experiments to investigate the effects of the film thickness in terms of the threshold laser power and bubble growth rate (see Fig.…”

Section: Resultsmentioning

confidence: 99%

Optofluidic microvalve-on-a-chip with a surface plasmon-enhanced fiber optic microheater

et al. 2014

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We present an optofluidic microvalve utilizing an embedded, surface plasmonenhanced fiber optic microheater. The fiber optic microheater is formed by depositing a titanium thin film on the roughened end-face of a silica optical fiber that serves as a waveguide to deliver laser light to the titanium film. The nanoscale roughness at the titanium-silica interface enables strong light absorption enhancement in the titanium film through excitation of localized surface plasmons as well as facilitates bubble nucleation. Our experimental results show that due to the unique design of the fiber optic heater, the threshold laser power required to generate a bubble is greatly reduced and the bubble growth rate is significantly increased. By using the microvalve, stable vapor bubble generation in the microchannel is demonstrated, which does not require complex optical focusing and alignment. The generated vapor bubble is shown to successfully block a liquid flow channel with a size of 125 lm Â 125 lm and a flow rate of $10 ll/min at $120 mW laser power.

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Surface-plasmon-induced light absorption on a rough silver surface

Cited by 70 publications

References 17 publications

High-throughput patterning of photonic structures with tunable periodicity

High-throughput patterning of photonic structures with tunable periodicity

Dependence of Q Factor on Surface Roughness in a Plasmonic Cavity

Optofluidic microvalve-on-a-chip with a surface plasmon-enhanced fiber optic microheater

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