Facility Overview

Experimental Facility

ERC-326 Lab:

  • Tunable Light Source (Oriel, TLS-250Q, UV-VIS-NIR) with a monochromator and a lock-in amplifier (Oriel, Merlin) for external quantum efficiency (EQE) characterization of solar and near-IR cells with reference detectors, and for angular and polarization dependent spectral-hemispherical or diffuse reflection/transmission/absorption measurement with an 8” PTFE integrating sphere (IS). Compatible fiber optics assembly is also available for small samples;
  • Fourier-transform spectrometer (Thermo Scientific Nicolet iS50, VIS-NIR-MIR) for characterizing wavelength, angle, polarization, temperature-dependent reflection/transmission/absorption/emission of samples in milimeter sizes from cryogenic to high temperatures:
    • Smart iTR™ attenuated total reflectance (ATR) sampling accessory;
    • Transmission accessory with home-built heating stage (room temp to 150C) for semi-transparent samples;
    • Harrick Scientific Seagull variable angle (5~85deg) specular reflection accessory with heating stage (room temp to 150C) for opaque samples;
    • PIKE 10Spec 10 degree specular reflection accessory (room temp) for semi-transparent samples;
    • PIKE VeeMax variable angle (30~80deg) specular reflection accessory (room temp) for semi-transparent samples;
    • PIKE IntegratIR 3” gold integrating sphere for measuring infrared hemispherical/diffuse transmission/reflection (room temp);
    • FTIR fiber optics with Harrick FiberMate2™ fiber optic coupler and optical fibers (VIS-NIR-MIR) for in-situ spectral characterization of material properties due to thermal, mechanical, electrical or chemical changes;
    • High-temperature emissometry home built with a blackbody calibration source for characterizing spectral-directional emissivity from 200C up to 1000C);
    • Cryogenic-to-high-temperature spectrometry platform home-built with optical cryostats (Janis, VPF-800) coupled with FTIR spectrometer (VIS-NIR-MIR) for characterizing spectral-directional reflectance/transmittance/absorptance of samples cooled or heated in high vacuum environment from 77K – 800K;
  • Fourier-transform Infrared Microscope (Thermo Scientific Nicolet Continuum) for characterizing spectral reflection/transmission/absorption/emission of samples down to tens of micrometer sizes with heating stage (room temp to 150C) or under electrical gating;
  • Microscale Optical Reflection and Transmission Microscope (MORT) home-built with fiber-coupled QTH lamp, optic fibers, and CCD spectrometer (200~1000nm) integrated with LabVIEW-controlled scanning laser thermoreflectance (TR) via x40 objectives for 2D temperature mapping with high spatial resolution down to 2 micrometer;
  • Dynamic cryothermal setup home-built for measuring tunable radiative heat flux between an emitter made of variable-emittance coating and a receiver with both temperatures precisely feedback controlled from 77 K to 800 K in a high vacuum environment of a cryostat with a turbo pump (Pfeiffer HiPace 80);
  • AFM tip-based near-field thermal metrology home-built to measure near-field radiative heat transfer based on laser-deflection technique with bimaterial cantilever and to study near-field force interaction with tuning fork at vacuum gaps down to 30nm precisely controlled by a piezo stage (MCL Nano-OP30) in high vacuum environment provided by a 18” stainless steel belljar vacuum chamber and a turbo pump (Agilent TPS-Flexy); (in progress)
  • Plate-Plate near-field thermal metrology (static) home-built to measure steady-state near-field radiative heat transfer between 5x5mm2 samples at vacuum gaps down to 100nm created by either nanoparticles or patterned SU8 posts inside a 12” stainless steel belljar vacuum chamber and a turbo pump (Pfeiffer HiPace 80);
  • Plate-Plate near-field thermal metrology (tuning) home-built to measure tunable/transient near-field radiative heat transfer between 1cm2 samples at vacuum gaps down to 200nm created by patterned SU8 posts along with in-situ gap capacitance measurement inside a 12” pyrex belljar vacuum chamber and a turbo pump;
  • One 5’x8′ optical table for optical characterization and one 4’x6′ vibration isolation optical table for near-field thermal metrology and imaging;
  • Two Class 1000 modular softwall cleanrooms (Clean Air Products) for housing all optical and near-field thermal metrologies to minimize the dust contamination;
  • One 6′ fume hood along with spin coater, ultrasonic cleaner, hotplate for in-lab sample preparation and synthesis;
  • Optical microscopes: upright, inverted, dark-field, boom-stand, etc;

ERC-366 Lab:

  • Outdoor radiative cooling test setup home-built with auto 8-channel temperature logger (Omega, OM-USB-TC) and accurate real-time solar pyranometer (KippZonen, CMP3) for measuring stagnation temperature, and with a built-in heater and digital power supply for measuring radiative cooling power of novel radiative cooling coatings;
  • Solar thermal/thermopohotovaltaic test home-built with a 1kW solar simulator (Newport, Xe lamp) optically coupled with 12” box vacuum chamber in high vacuum provided by a turbo pump (Pfeiffer HiPace 80) to characterize solar-to-heat efficiency for novel selective solar absorbers, and solar-to-power efficiency with selective absorber/emitter and thermophotovoltaic cells under variable solar concentrations up to 60 suns for 1cm2 samples/devices;
  • Thermopohotovaltaic test home-built with variable vacuum gap distance between the emitter and the cell by a Z-stage inside a 24” stainless steel belljar vacuum chamber with a turbo pump (Agilent, TPS Compact) to characterize TPV conversion with selective emitter/filter/cell at high temperatures;
  • Atomic force microscope home-built with A-probe (NanoAndMore), 3D nanopositioner (MCL, Nano-3D200), and digital feedback controller (MCL, MadPLL) for surface topography imaging of micro/nanostructures;
  • Parallelism-plate radiative thermal metrology home-built with Labview controlled tip-tilt motions by motorized stages to align two planar surfaces out of thermal equilibrium without contact down to hundreds of nanometer vacuum gaps for far-field and near-field radiative heat measurement; (in progress)
  • Thermal property analyzer (Hotdisk 2500S) based on transient-plane source method for fast characterizations of thermal conductivity/diffusivity and specific heat capacity of various materials with full modules, sensors, and software; (rotating with Profs. Beomjin Kwon and Qiong Nian)
  • High-vacuum STM/AFM (RHK Beetle) with variable magnetic field and optical access for studying extreme near-field radiative transfer; (DURIP award, system delivered but to be installed)
  • Electronic equipment such as lock-in amplifier (SRS-830), source meter (Keithley 2400), digital multimeters (Keithley 2000, 2100, 6500), DC power supplies (Keithley 2200 and 2230), function generator (Tektronix 2021), digital oscilloscope (Tektronix DPO2024) along with Keithley KickStart data acquisition software;
  • Thermal characterization equipment such as Omega temperature controllers, LakeShore cryogenic temperature controller, etc

Computational Resources

ERC-329 Office:

  • 2x High-performance Workstations (Dell Precision T7600, 2 eight-core processors at 3.10GHz, 64GB Ram) for simulation work
  • 4x Office Workstations (Dell Precision T1650, 2 four-core processors at 3.40GHz, 8GB Ram)
  • Commercial ANSYS Full Research Package for multiphysics simulation of coupled optical, thermal, mechanical phenomena at nanoscale
  • Commercial EM full-wave simulation package from Lumerical FDTD Solutions with one full license plus one additional engine license
  • Home-made Matlab codes for modeling radiative properties of multilayer thin films (thin-film optics and transfer matrix method, isotropic and anisotropic)
  • Home-made Matlab codes for modeling radiative properties of multilayer periodic micro/nanostructures (1D and 2D rigorous coupled-wave analysis)
  • Home-made Matlab codes for modeling near-field thermal radiation between planar layered structures and patterned structures with effective medium theory (fluctuational electrodynamics, isotropic and anisotropic)
  • Home-made Matlab codes for modeling near-field thermal radiation between periodic micro/nanostructures (fluctuational electrodynamics in combination with rigorous coupled-wave analysis based on scattering matrix method)

User Facility and Resources available at ASU

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