Nanomaterials for Plasmonic Devices. Lih J. Chen

Nanomaterials for Plasmonic Devices Lih J. Chen Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan

Papers on Plasmon: 75,000 (6/25/2018)

Papers on Plasmonics: 31,262 (6/22/2018)

M.L. Juan et al. Nature Photonics 5, 349 (2011)

https://en.wikipedia.org/wiki/surface_plasmon

Papers on Plasmon: 75,000 (6/25/2018)

O1. Plasmonic laser (optical circuit) O2. Nanoantennas O3. Photodetectors E1. H 2 production (energy/environment) E2. Dye-sensitized solar cells E3. Photocatalytic activities S1. Detectors for intermediates (sensing)

All-Color Plasmonic Nanolasers Y.J. Lu et al. Nano Lett. 14, 4381 (2014)

Room temperature UV nanolaser (a) Real and (b) imaginary parts of the permittivities of Al, Au and Ag. Davy, G. et al. Journal of Physics D: Applied Physics. 48 (2015) C.W. Cheng et al. ACS Photonics (2018)

Properties of ZnO 1. II-VI semiconductor group 2. Melting point: 1975 3. Crystal structure: Wurtzite structure/ Zinc blende structure 4. Wide and direct band gap : 3.37eV 5. Large exciton binding energy: 60meV

Intensity (arb. units) FWHM (nm) Intensity (arb. units) Plasmonic lasers 16 14 12 10 8 6 4 2 1.42 MW/cm 2 6.39 MW/cm 2 7.81 MW/cm 2 9.23 MW/cm 2 Pump density (MW/cm 2 ) 10 0 350 360 370 380 390 400 410 420 430 Wavelength (nm) 14

Group index Threshold power (MW/cm 2 ) Effect of Al 2 O 3 thickness on optical properties 14 12 10 8 6 n g =(λ 2 /2 Δ λl) 25 20 15 10 4 5 0 nm 5 nm 10 nm 15 nm Thickness of Al 2 O 3 0 nm 5 nm 10 nm 15 nm Thickness of Al 2 O 3 17

Field energy density Simulation Al 2 O 3 = 360 nm Al 2 O 3 = 5 nm Al 2 O 3 = 10 nm Al 2 O 3 = 15 nm max Wavelength= 37818 nm min

EDS 1 2 1-ALD Al 2 O 3 Eleme nt Weight % Atomic % O K 49.19 62.02 Al K 50.81 37.98 2-Native Al 2 O 3 Eleme nt Weight % Atomic % O K 40.87 53.83 Al K 59.13 46.17

AFM Native Al 2 O 3 r ms = 1.14 nm ALD-grown Al 2 O 3 r ms = 0.87 nm

The order in energy density for the 3 dielectric layers : Y 2 O 3 > TiO 2 >Al 2 O 3 with stimulated wavelength of 378 nm.

Au Nanocrystal Array/Silicon Nanoantennas as Wavelength- Selective Photoswitches Y.K. Lin et al. Nano Lett. 13, 2723 (2013)

Experimental Metal-assisted Chemical Etching (MaCE) H 2 O H2 O 2 Cathode reaction H 2 O 2 + 2H + 2H 2 O + 2h + HF Anode reaction Si + 4HF 2 SiF 6 2 + 2HF + H 2 +2e Nano Structures and Dynamics Lab 24

Results Au-Nanocrystal-Array/Si Nanostructures with Varied Degree of Immersion DOI: Degree of Immersion DOI = 0 DOI = 0.25 DOI = 0.5 DOI = 0.75 DOI = 1 Nano Structures and Dynamics Lab 25

I light - I dark ( A / W) Results Photocurrent Increment under 532 nm Laser Illumination 5 4 DOI = 0 DOI = 0.5 bare Si log 10 E 2 2 z λ = 532 nm 3 2 z Si bare Si 1 Au/Ti Au/Ti Si 0 0 50 100 150 200 Voltage (mv) I light : current measured under laser illumination I dark : current measured under dark condition DI (Photocurrent increment) = I light - I dark 0 k E z Si DOI = 0 Si DOI = 0.5 Nano Structures and Dynamics Lab 26

I light - I dark ( A / W) Results Photocurrent Increment under 655 nm Laser Illumination 1.5 DOI = 0 DOI = 0.5 bare Si log 10 E 2 2 z λ = 655 nm Si 1.0 z bare Si 0.5 Au/Ti Au/Ti Si 0.0 0 50 100 150 200 Voltage (mv) I light : current measured under laser illumination I dark : current measured under dark condition DI (Photocurrent increment) = I light - I dark 0 k E z Si DOI = 0 Si DOI = 0.5 Nano Structures and Dynamics Lab 27

Plasmon-Enhanced Photocatalytic Hydrogen Production on Au/TiO 2 Hybrid Nanocrystal Arrays B.H. Wu et al. Nano Energy, 27, 412-419 (2016)

Surface Plasmon Resonance Enhancement of Production of H 2 from Ammonia Borane Solution with Tunable Cu 2-x S Nanowires Decorated by Pd Nanoparticles P.H. Liu et al. Nano Energy, 31, 57-63 (2017).

Pei-Hsuan Liu, Meicheng Wen, Chih-Shan Tan, Miriam Navlani-García, Yasutaka Kuwahara, Kohsuke Mori, Hiromi Yamashita, Lih-Juann Chen Surface plasmon resonance enhancement of production of H2 from ammonia borane solution with tunable Cu2 xs nanowires decorated by Pd nanoparticles Nano Energy, Volume 31, 2017, 57 63 http://dx.doi.org/10.1016/j.nanoen.2016.10.064

Plasmonic Enhancement of Au Nanoparticle Embedded Single- Crystalline ZnO Nanowire Dye- Sensitized Solar Cells M.Y. Lu et al. Nano Energy 20, 264-271 (2016)

Ultrahigh density plasmonic hot spots with ultrahigh electromagnetic field for improved photocatalytic activities T.H. Yang et al. Applied Catalysis B: Environmental 181, 612-624 (2016)

a b 1 μm 200 nm c d

C.S. Tan et al. Scientific Reports, 5, 13759 (2015)

Papers on Plasmon: 75,000 (6/25/2018)

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