Journal: Nature Communications

Article Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

doi: 10.1038/s41467-017-00115-4

Figure Lengend Snippet: Samples for two-laser Raman thermometry experiment. a Schematic picture of the periodic porous membrane—square lattice of cylindrical holes in the free-standing membrane, where t = 250 nm is the membrane thickness, d is the hole diameter, a is the lattice parameter and n stands for the neck. b Top view of the sample design depicting the temperature scan direction and crystallographic orientation. The porous area is enclosed by two circles with diameters of about 5 and 100 μm. c , d Scanning electron microscope images of sample S2 ( a = 250 nm and d = 140 nm). Scale bars in c , d are 20 and 2 μm, respectively

Article Snippet: The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam).

Techniques: Membrane, Microscopy

Journal: Nature Communications

Article Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

doi: 10.1038/s41467-017-00115-4

Figure Lengend Snippet: Two-laser Raman thermometry results. Linear and corresponding logarithmic temperature profiles of a , b pristine 250 nm thick silicon membrane and c , d sample S3 with lattice parameter of a = 200 nm and hole diameter of d = 130 nm. Red circle-line and blue square-line plots indicate experimental data obtained in vacuum and air, respectively. Solid lines in b , d denote theoretical fits using Eq. . Error bars in a , b , c , d represent experimental uncertainties of the measured temperature (see Methods Section). e Volume reduction factor ε as a function of porosity calculated by FEM and using analytical expressions. f Measured temperature map of the sample S1 with lattice parameter a = 300 nm and hole diameter d = 135 nm

Article Snippet: The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam).

Techniques: Membrane

Journal: Nature Communications

Article Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

doi: 10.1038/s41467-017-00115-4

Figure Lengend Snippet: One- and two-phonon Raman spectra. Data obtained for pristine 250 nm membrane and S1 at room temperature in \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${x_3}\left( {{x_1}{x_1}} \right){\bar x_3}$$\end{document} x 3 x 1 x 1 x ¯ 3 scattering geometry. The arrows indicate critical points of the first Brillouin zone of bulk silicon, where TA and TO are transverse acoustic and optical modes, respectively, and LO are longitudinal optical modes

Article Snippet: The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam).

Techniques: Membrane

Journal: Nature Communications

Article Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

doi: 10.1038/s41467-017-00115-4

Figure Lengend Snippet: Schematics of the two-laser Raman thermometry experiment. The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam). The non-polarising cube BS and three powermeters are used to determine the absorbed power P 0 from intensities of the incident, transmitted and reflected laser beams

Article Snippet: The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam).

Techniques: Microscopy

Journal: Nature Communications

Article Title: Thermal conductivity and air-mediated losses in periodic porous silicon membranes at high temperatures

doi: 10.1038/s41467-017-00115-4

Figure Lengend Snippet: The two-laser Raman thermometry calibration. a Temperature as a function of silicon longitudinal optical phonon frequency. The circles indicate experimental data points. The solid line stands for the linear fit with slope of -43.43 ± 0.05 K(cm −1 ) −1 calculated for data ranging between 300 and 870 K. b Representative Raman spectra obtained in vacuum for S1 at different distances r from the heating spot; black , blue and red circles correspond to r = 10, 20 and 40 μm, respectively. Solid lines indicate Lorentzian function fits of the corresponding experimental data

Article Snippet: The setup is based on the triple-grating Raman spectrometer (T64000, Horiba) and the vacuum temperature controlled microscope stage (THMS350V, Linkam).

Techniques: