{"id":64,"date":"2019-05-29T11:26:39","date_gmt":"2019-05-29T15:26:39","guid":{"rendered":"https:\/\/www.bu.edu\/nano\/?page_id=64"},"modified":"2021-07-15T10:02:38","modified_gmt":"2021-07-15T14:02:38","slug":"charac_lab","status":"publish","type":"page","link":"https:\/\/www.bu.edu\/nano\/charac_lab\/","title":{"rendered":""},"content":{"rendered":"<h2 class=\"style52\" style=\"text-align: center;\">The\u00a0Ultrafast\u00a0Nanostructure\u00a0Optics\u00a0(UNO)\u00a0Laboratory<\/h2>\n<p align=\"center\" class=\"style55\"><em>&#8220;To think without observing is as dangerous as observing without thinking&#8221; (S.R.y Cajal)<\/em><\/p>\n<p align=\"justify\" class=\"style53\">Our Ultrafast Nanostructure Optics Labs are located in the Boston University Photonics Center.<\/p>\n<p align=\"justify\" class=\"style54\"><strong>PHO 809<\/strong><span>\u00a0<\/span><strong>Ultrafast Nanostructure Optics<\/strong><span>\u00a0<\/span>(UNO) Laboratory: The research is mainly focused on: a) ultrafast emission spectroscopy; b) optical gain relaxation dynamics; c) nonlinear optical characterization of semiconductor nanostructures, novel bio-compatible materials, photonic and plasmonic nano-devices. Implemented Optical techniques include: picosecond fluorescence lifetime spectroscopy, time-resolved variable stripe length and pump-probe gain techniques, time-resolved femtosecond pump-probe spectroscopy, emission quantum efficiency and photon statistics, Z-scan nonlinear characterization, second harmonic generation (SHG).<\/p>\n<ul>\n<li>Room temperature and cryogenic temperature picosecond fluorescence set up, consisting of: 1) high power, widely tuneable Ti:Sa laser (100fs, 3W, Spectra Physics MaiTai HP); 2) efficient second and third harmonic generators (GWU-23FL, Spectra Physics; 3) an electro-optic modulator (Conoptics 350-160) for pulse peaking; 4) a ps-resolution, photon-counting Streak camera detector (Hamamatsu C4780).<\/li>\n<li>Optical Parametric Oscillator (OPO), Spectra Physics Auto Inspire 100, unprecedented tuning range from 345 nm to 2.5\u03bcm gap-free, adjustable pulse width from 80 to 350 fs.<\/li>\n<li>time-resolved differential transmission with 10 femtosecond time resolution using piezo-controlled optical delay lines<\/li>\n<\/ul>\n<blockquote><p>&nbsp;<\/p><\/blockquote>\n<p><img loading=\"lazy\" width=\"762\" height=\"284\" class=\"alignnone wp-image-175\" alt=\"\" src=\"\/nano\/files\/2019\/06\/809-636x237.jpg\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/809-636x237.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/809-768x286.jpg 768w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/809-1024x381.jpg 1024w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/809.jpg 1242w\" sizes=\"(max-width: 762px) 100vw, 762px\" \/><\/p>\n<p align=\"justify\" class=\"style54\"><strong>Spectra Physics Auto Inspire 100 &#8211; Optical Parametric Oscillator (OPO)<\/strong><\/p>\n<p align=\"justify\" class=\"style54\"><img loading=\"lazy\" width=\"762\" height=\"284\" class=\"alignnone wp-image-174\" alt=\"\" src=\"\/nano\/files\/2019\/06\/OPO-636x237.jpg\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO-636x237.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO-768x287.jpg 768w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO-1024x382.jpg 1024w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO.jpg 1238w\" sizes=\"(max-width: 762px) 100vw, 762px\" \/><\/p>\n<p align=\"justify\"><strong>Custom-made dark-field\/bright-field microscope for the study of photonic\/plasmonic structures<\/strong><\/p>\n<p align=\"justify\">The system enables dark-field scattering in transmission and reflection configurations, , photoluminescence and time-resolved photoluminescence, photonic band-dispersion measurements.<\/p>\n<p align=\"justify\" class=\"style54\"><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/IMG_1450-636x477.jpg\" alt=\"\" width=\"636\" height=\"477\" class=\"alignnone size-medium wp-image-192\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/IMG_1450-636x477.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/IMG_1450-768x576.jpg 768w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/IMG_1450.jpg 1024w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/Microscope_Laser-1-636x477.jpg\" alt=\"\" width=\"636\" height=\"477\" class=\"alignnone size-medium wp-image-191\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Microscope_Laser-1-636x477.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Microscope_Laser-1.jpg 640w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/p>\n<p align=\"justify\" class=\"style54\"><strong>PHO 808 Luminescence Laboratory:<span>\u00a0<\/span><\/strong>The research is mainly focused on the steady-state optical spectroscopy of semiconductor nanostructures, bio-compatible materials and plasmonic devices. Implemented Optical techniques include: Broad-band Photoluminescence Excitation Spectroscopy (PLE), Emission lifetime measurements under steady state (CW) excitation, CW photoluminescence (PL), CW Quantum efficiency.<\/p>\n<ul>\n<li>The PLE experimental set up, consisting of 1000W Xe broadband source which is monochromatized by a computer-controlled f\/4 monochromator (Cornerstone 260). The photoluminescence spectra will be spectrally dispersed by a second identical monochromator and finally acquired for different pump wavelengths (PLE spectra) by a PMT detector and a lock in amplifier.<\/li>\n<li>CW photoluminescence excitation (PLE) and resonant techniques (using a pump Ar laser, He-Cd, or a 1000W Xe lamp as a white light source)<\/li>\n<li>absolute photoluminescence quantum efficiency measurements using calibrated radiometric equipment and coupled integrating spheres from LabSpheres, inc.<\/li>\n<li>Olympus microscope with custom-made sample stage for tilting the sample angle around 2 independent axes, dark-field and bright-field objectives. The tilting capability enables the measurement of photonic band dispersion from micrometer-size arrays. This setup will be used for frequency and angular scattering measurements on plasmonic nanostructures<\/li>\n<\/ul>\n<p align=\"justify\" class=\"style54\"><strong>Olympus IX7 Microscope \/ Andor Shamrock (750) Spectrometer<\/strong><\/p>\n<p align=\"justify\" class=\"style54\"><img loading=\"lazy\" width=\"636\" height=\"301\" class=\"alignnone size-medium wp-image-187\" alt=\"\" src=\"\/nano\/files\/2019\/06\/Olympus_Andor-636x301.jpg\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Olympus_Andor-636x301.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Olympus_Andor-768x364.jpg 768w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Olympus_Andor.jpg 950w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/p>\n<p align=\"justify\" class=\"style54\"><strong>Continuum M150 Probe Station<\/strong><\/p>\n<p align=\"justify\" class=\"style54\"><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/Probe_Station-636x477.jpg\" alt=\"\" width=\"636\" height=\"477\" class=\"alignnone size-medium wp-image-193\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Probe_Station-636x477.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Probe_Station.jpg 640w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/p>\n<p align=\"justify\" class=\"style54\"><strong>Computational electromagnetics resources:<span>\u00a0<\/span><\/strong>Electrodynamics modeling of complex photonic devices, such as photonic crystal structures and nano-plasmonics components. The main computational techniques available in our group are:\u00a0 Generalized Mie theory (GMT), T-matrix, Mie scattering codes, Discrete Dipoles and Coupled Dipoles codes, Finite Difference Time Domain (FDTD), Finite Elements (FEM),<span>\u00a0<\/span><em>ad hoc<\/em><span>\u00a0<\/span>computational models for the solution of specialized research problems.<\/p>\n<p align=\"justify\"><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/Cluster_New.jpg\" alt=\"\" width=\"480\" height=\"510\" class=\"alignnone size-full wp-image-194\" \/><\/p>\n<p>Picture of the<span>\u00a0<\/span><strong>DURIP cluster<span>\u00a0<\/span><\/strong>\u2013 fully operational 192 AMD cores, 512GB memory, 10 Tb storage, Fast G-bit Interconnect<\/p>\n<p align=\"justify\">(From left to right) Prof. Bellotti and Prof. Dal Negro<\/p>\n<blockquote><p>Emission, PLE spectroscopy and Ultrafast pump-probe set up configuration:<\/p>\n<div align=\"justify\">\n<ol>\n<li>The PLE experimental set up, consisting of 1000W Xe broadband source which is monochromatized by a computer-controlled f\/4 monochromator (Cornerstone 260). The photoluminescence spectra will be spectrally dispersed by a second identical monochromator and finally acquired for different pump wavelengths (PLE spectra) by a PMT detector and a lock in amplifier.<\/li>\n<li>Room temperature and cryogenic temperature (4K) CW photoluminescence set up.<\/li>\n<li>Room temperature and cryogenic temperature picosecond fluorescence set up, (Shown in figure 1) consisting of: 1) high power, widely tuneable Ti:Sa laser (100fs, 3W, Spectra Physics MaiTaiHP); 2) efficient second and third harmonic generators (GWU-23FL, Spectra Physics; 3) an electro-optic modulator (Conoptics 350-160) for pulse peaking; 4) a ps-resolution, photon-counting Streak camera detector (Hamamatsu C4780).<\/li>\n<li>Hamamtsu Extended Photon Counting Detector (PMT R5509-73), Flat response from visible to near IR minimizes spectral sensitivity correction. The spectral response covers a wide range from 0.3micron to 1.7micron. Time resolved measurement in the near IR can be realized with fast time response (Rise time): 3ns.<\/li>\n<li>Newport optical delay line, Travel Range: 600 mm, Resolution: 0.1 \u00b5m, Maximum Delays: 4ns<br \/>\nDelay sensitivity: 0.67fs<\/li>\n<\/ol>\n<\/div>\n<p align=\"justify\"><strong>Configuration of Picosecond florescence and Pump and Probe set up for optical gain measurements.<\/strong><\/p>\n<p align=\"justify\"><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/Fig1-1-636x284.jpg\" alt=\"\" width=\"636\" height=\"284\" class=\"alignnone size-medium wp-image-195\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Fig1-1-636x284.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Fig1-1.jpg 640w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/p>\n<p align=\"justify\"><strong>Lab Photos<\/strong><\/p>\n<p><img loading=\"lazy\" width=\"636\" height=\"477\" class=\"alignnone size-medium wp-image-179\" alt=\"\" src=\"\/nano\/files\/2019\/06\/Lab_People1-636x477.jpg\" style=\"text-align: justify;\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Lab_People1-636x477.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/Lab_People1.jpg 640w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><\/p>\n<figure id=\"attachment196\" aria-describedby=\"caption-attachment196\" style=\"width: 646px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" src=\"\/nano\/files\/2019\/06\/OPO_Lap-636x477.jpg\" alt=\"\" width=\"636\" height=\"477\" class=\"size-medium wp-image-196\" srcset=\"https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO_Lap-636x477.jpg 636w, https:\/\/www.bu.edu\/nano\/files\/2019\/06\/OPO_Lap.jpg 640w\" sizes=\"(max-width: 636px) 100vw, 636px\" \/><figcaption id=\"caption-attachment196\" class=\"wp-caption-text\">SAMSUNG<\/figcaption><\/figure>\n<p align=\"justify\">\n<\/blockquote>\n","protected":false},"excerpt":{"rendered":"<p>The\u00a0Ultrafast\u00a0Nanostructure\u00a0Optics\u00a0(UNO)\u00a0Laboratory &#8220;To think without observing is as dangerous as observing without thinking&#8221; (S.R.y Cajal) Our Ultrafast Nanostructure Optics Labs are located in the Boston University Photonics Center. PHO 809\u00a0Ultrafast Nanostructure Optics\u00a0(UNO) Laboratory: The research is mainly focused on: a) ultrafast emission spectroscopy; b) optical gain relaxation dynamics; c) nonlinear optical characterization of semiconductor nanostructures, novel [&hellip;]<\/p>\n","protected":false},"author":16034,"featured_media":0,"parent":0,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"page-templates\/no-sidebars.php","meta":[],"_links":{"self":[{"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/pages\/64"}],"collection":[{"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/users\/16034"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/comments?post=64"}],"version-history":[{"count":11,"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/pages\/64\/revisions"}],"predecessor-version":[{"id":317,"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/pages\/64\/revisions\/317"}],"wp:attachment":[{"href":"https:\/\/www.bu.edu\/nano\/wp-json\/wp\/v2\/media?parent=64"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}