| Instrument | Status | Status Notes |
|---|---|---|
| 6″ Sputter deposition |  |
Air leak on the gate valve pneumatic cylinder
Cr – 100 W 10 nm/min Load: 3.49 Tune: 1.66 |
| 8″ Sputter deposition | |
Issues – Need to fix the hoist or take weight off the system |
| Denton e-beam deposition | |
|
| Fredrick e-beam deposition |  |
Cryo pump and compressor needs a rebuild |
| Parylene Coater | |
|
| TRION | |
Rough pump needs to be rebuild, but it is operational with the CAIBE rough pump which gives a better vacuum |
| CAIBE | |
Need to test with water cold stage and determine the beam current |
| March | |
Cleaning: 200 W, 100 sccm O2, 300 secs PDMS bonding: 40-50 W (maybe hard to get reflective power below 10 W), 100 sccm O2, 60 secs, after plasma treatment place the PDMS and glass together and heat treat at 80oC for 60 mins Stripping carbonized SU-8: 300 W, 100 sccm O2, 300 secs (may take longer, depending on thickness) |
| Ellipsometer | |
|
| FTIR | |
Issues – Calibration |
| Curvature System | |
Issues – Calibration |
| Oxidation Furnace | |
|
| Diffusion Furnace | |
|
| 2″ Furnace | |
|
| RTP | |
TC wafer needs replacing and spot welded onto the connectors |
| EasyNano CVD CNT | |
Issue: Need to replace the pressure switch in the gas cabinet as it is flaky |
| Dicing Saw | |
|
| EV620 Mask Aligner | |
Turning off the lamp to preserve the life timeIssues – Logging sometimes fails as the optics stage gets stuck, the y motor also losses firmware if system is off too long |
| Wet bench – Chemical processing | |
|
| Vacuum oven | |
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| Hotplates | |
|
| Spinner | |
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| Wire bonder | |
|
| Filmertics 3D Profiler | |
|
| Cleanroom Optical Microscopy | |
Issues – Calibrate the CCD capture measurements |
| Probe station | |
Issues – Need to install new probes from eBay |
| 4200A – SCS Parameter Analyzer | |
|
| Four point conductivity | |
|
| Atomic Layer Deposition | |
20190401 – New TDMAH installed and Hf deposition tuned to give a 4″ uniform deposition, growth rate is too fast per cycle, need to calibrate for the ALD region
20181205 – Milled a trench in the sleeve, put in the old ceramic pins, put in metal pins to stop the sleeve from moving 20181015 – Redo the N2 to be SS instead of plastic 201805023 – set up the process to represent an ALD valve that has constant Ar carrier flow 20180601 – Installed Ferrocene iron ALD source 20180814 – changed the precursor setup – Ferrocene is not producing a vapor pressure? 20190102 – Replaced the manual shut off valve on the ferrocene with an all metal valve – finally do not see F – not sure if it was the valve. Disconnected all the lines to the shower head that is not used. 20190219 – Installed the TDMAH to test uniformity and optimize the system |
| Big blue wet benches |  |
20181015 – Connected the 3-phase supply to the left side
Connected the aspirator, ran a new waste line to the current acid neutralization system. Need to install an automatic water shut off valve to the house water as the shut off requires a 10′ ladder to get to.
|
Chathura de Alwis1, Timothy R. Leftwich2, Kathryn A. Perrine1,*
1 – Department of Chemistry, Michigan Technological University, Houghton, MI 49931
2 – Department of Material Science & Engineering, Michigan Technological University, Houghton, MI 49931
*corresponding author; kaperrin@mtu.edu
Abstract
Vibrational spectroscopy techniques have evolved to measure gases, liquids, and solids at surfaces and interfaces. In the field of surface-sensitive vibrational spectroscopy, infrared spectroscopy measures the adsorption on surfaces and changes from reactions. Previous polarized modulated-infrared reflection–absorption spectroscopy (PM-IRRAS) measurements at the gas/solid interface were developed to observe catalytic reactions near reaction conditions. Other PM-IRRAS measurements use liquid cells where the sample is submerged and compressed against a prism that has traditionally been used for electrochemical reactions. This article presents a new method that is used to observe in situ adsorption of molecules using PM-IRRAS at the gas/liquid/solid interface. We demonstrate the meniscus method by measuring the adsorption of octadecanethiol on gold surfaces. Characterization of self-assembled monolayers (SAMs), the “gold standard” for PM-IRRAS calibration measurements, was measured in ethanol solutions. The condensed-phase (air/liquid) interface in addition to the liquid/solid interface was measured simultaneously in solution. These are compared with liquid attenuated total reflectance (ATR)-Fourier transform infrared (FTIR) spectroscopy measurements to confirm the presence of the SAM and liquid ethanol. A model of the three-phase system is used to approximate the thickness of the liquid ethanol layer and correlate these values to signal attenuation using PM-IRRAS. This proof-of-concept study enables the measurement of reactions at the gas/liquid/solid interface that could be adapted for other reactions at the electrode and electrolyte interfaces with applications in environmental science and heterogeneous catalysis.
Au/Cr coated glass slides produced using the 6″ Sputtering system in the Microfabrication Facility
de Alwis, C., Leftwich, T.R. and Perrine, K.A., 2020. New Approach to Simultaneous In Situ Measurements of the Air/Liquid/Solid Interface Using PM-IRRAS. Langmuir, 36(13), pp.3404-3414.
ANDREY A. VORONOV,1,2,* DOLENDRA KARKI,3 DARIA O. IGNATYEVA,1,2 MIKHAIL A. KOZHAEV,2,4 MIGUEL LEVY,3 AND VLADIMIR I. BELOTELOV1,2
1- Faculty of Physics, Lomonosov Moscow State University, Leninskie Gory, 1-2, Moscow 119991, Russia
2 – Russian Quantum Center, Bolshoy Boulevard 30, bld. 1, Moscow 121205, Russia
3 – Physics Department, Michigan Technological University, Houghton, MI 49931, USA
4 – Prokhorov General Physics Institute of the Russian Academy of Science, 38 Vavilov Street, Moscow 119991, Russia
We provide the experimental research on a novel type of all-dielectric magnetic structure designed to achieve an enhanced magneto-optical response. 1D grating fabricated via etching of bismuth substituted iron garnet film supports the excitation of optical guided modes, which are highly sensitive to the external magnetic field. A unique feature of proposed structure is the synergetic combination of high transparency, tunability, high Q-factor of the resonances and superior magneto-optical response that is two orders higher in magnitude than in the non-structured smooth iron-garnet film. The considered all-dielectric magnetic garnet structures have great potential in various fields including the magneto-optical modulation of light, biosensing and magnetometry.
Voronov, A.A., Karki, D., Ignatyeva, D.O., Kozhaev, M.A., Levy, M. and Belotelov, V.I., 2020. Magneto-optics of subwavelength all-dielectric gratings. Optics Express, 28(12), pp.17988-17996.