NIRT: Opto-Plasmonic Nanoscope Nanoscope in Plasmonic Era Objective: Plasmonic microscopy with sub-wavelength resolution SPP Bloch modes in 2-D nanohole array
Pemberton, Patrick, Features Writer has reference to this Academic Journal, PHwiki organized this Journal NIRT: Opto-Plasmonic Nanoscope NSF NIRT Grant ECS-068863 PIs: Y. Fainman, V. Lomakin, A. Groisman, in addition to G. W. Schmid-Schoenbeim University of Cali as long as nia, San Diego, La Jolla, Cali as long as nia 92093-0407 Tel: (858) 534-8909; Fax: (858) 534-1225; E-mail: firstname.lastname@example.org; web site: http://emerald.ucsd.edu Microscope: Diffraction limited Nanoscope in Plasmonic Era Plasmonic nanoscope: Sub-diffraction limited A 1879 optical microscope Our focusing approach Sub-diffraction limited focusing R. Rokitski et al, Phys. Rev. Lett. 95, 177401 (2005) L. Yin et al, Nano Lett. 5, 1399 (2005) Objective: Plasmonic microscopy with sub-wavelength resolution Assuming small modulation (d a), in addition to no coupling between adjacent sides: Phase matching condition (resonant Woods anomaly): (planar case) (-X) Normalized frequency (wa/2pc = a/l) l~ 1.5 mm, NIR SPP Bloch modes in 2-D nanohole array Sample fabrication: nanoholes in metal films Variety of substrates (GaAs, Si, SiO2, Al2O3) Evaporation or sputtering of Al, Au, or Ag metallic films (thickness h ~ 50-200 nm) ICP-RIE in addition to wet etching (hole diameters d ~ 100-500 nm) SPP Heterodyne Imaging Setup Time averaged SPP mode Time-resolved SPP interferogram Input in addition to reference pulse: l0 = 1.55 mm FWHM ~ 200 fs CCD Output Sample illumination R. Rokitski, KA. Tetz, Y. Fainman, PRL, vol.95, no.17, 21 Oct. 2005, pp.177401/1-4 Time evolution of SPP wavepacket Spatial amplitude in addition to phaseof scattered SPP field t = 0 fs t = 133 fs t = 266 fs t = 400 fs Ultrafast SPP electrodynamics Spatial phase: focused SPP fields Spatial amplitude in addition to phase with converging in addition to diverging illumination R. Rokitski, KA. Tetz, Y. Fainman, Phys. Rev. Lett., vol.95, 2005, pp.177401/1-4 Radiative vs. material damping Simultaneous measurement of both planar in addition to corrugated surface propagation lengths Determines radiative decay (coupling strength) from grating array Diffractive plasmonics: SPP Fresnel Zone Plate SPP Fresnel Zone Plate A SPP Fresnel zone plate was fabricated at aluminum (Al)/air interface in addition to worked at the free space wavelength of 1.55 m (spp = 1.547 m). The designed focal length was 80 m. Fresnel Zone Plate Sample preparation in addition to fabrication Si-on-Al SPP Fresnel Zone Plate 20 m 5 m SPP plane wave excitation Excitation Array Detection Array How to make sure the incident SPP wave is planar Image with Fresnel zone plate Image without Fresnel zone plate Diffractive SPP focusing High intensity focused SPP field is observed SPP focusing SPP focusing after the compensation of radiation loss Measured focal length: 83m Designed focal length: 80m Fresnel diffraction of SPP Fresnel diffraction FEM Simulation: Transmission through Si bumps Power Transmission ~ 0.3 Calculated vs Measured Field Diffraction theory is valid as long as SPP Fresnel Diffraction Calculation Measurement Field intensity distribution at the focal plane Time-resolved SPP focusing Snapshots of amplitude at different time Education, Outreach, in addition to Data Dissemination Established new graduate courses: Nanophotonics (ECE 242A) in addition to Optics in Space in addition to Time (ECE 240B) Modified Undergraduate Photonics Laboratory in Engineering, Physics in addition to Biochemnistry (opt. comm., CGH, in addition to NLO) Graduate students weekly meetings in addition to seminars on recent progress in addition to other relevant topics in nanophotonics Involvement of undergraduate students via NSFs REU program Establishing education in addition to outreach projects with the UCSDs Preuss School, designed as long as 6-12 grades student coming from disadvantaged households [e. g., Ph.D. students are serving as mentors in addition to leaders of robotics club; RET program with the Undergraduate Photonics Laboratory in Engineering] Saperstein-2005 JSOE Woolley Fellow, 2006 Summer Graduate Teaching Fellow Numerous journal publications, conference presentations including invited conference papers http://emerald.ucsd.edu L. Feng, K. Tetz, B. Slutsky, V. Lomakin, Y. Fainman, Appl. Phys. Lett. 91, 081101 (2007) L. Feng, K. Tetz, B. Slutsky, V. Lomakin, Y. Fainman, Appl. Phys. Lett. 91, 081101 (2007) Imaging various SPP modes a/l0 ASE: = 1520-1570 nm Fainman Y, Tetz K, Rokitski R, Pang, Optics & Photonics News, vol.17, 24-9, 2006
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