Time-domain and lock-in rate-window photocarrier radiometric measurements of recombination processes in silicon

2005 ◽  
Vol 98 (12) ◽  
pp. 123518 ◽  
Author(s):  
Andreas Mandelis ◽  
Micha Pawlak ◽  
Chinhua Wang ◽  
Isabel Delgadillo-Holtfort ◽  
Josef Pelzl
Keyword(s):  
Time Domain ◽  
Radiometric Measurements ◽  
Recombination Processes ◽  
Lock In ◽  
Rate Window

Lock‐in rate‐window thermomodulation (thermal wave) and photomodulation spectrometry

1992 ◽  
Vol 63 (5) ◽  
pp. 2977-2988 ◽  
Author(s):  
Andreas Mandelis ◽  
Zhuohui Chen
Keyword(s):  
Thermal Wave ◽  
Lock In ◽  
Rate Window

Direct observation of electron emission and recombination processes by time domain measurements of charge pumping current

2015 ◽  
Vol 106 (4) ◽  
pp. 041603 ◽  
Author(s):  
Masahiro Hori ◽  
Tokinobu Watanabe ◽  
Toshiaki Tsuchiya ◽  
Yukinori Ono
Keyword(s):  
Direct Observation ◽  
Time Domain ◽  
Electron Emission ◽  
Charge Pumping ◽  
Recombination Processes

scholarly journals Experimental Study on the Spanwise Correlation of Vortex-Induced Force Using Large-Scale Section Model

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Chunguang Li ◽  
Yu Mao ◽  
Yan Han ◽  
Kai Li ◽  
C.S. Cai
Keyword(s):  
Time Domain ◽  
Large Scale ◽  
Correlation Coefficients ◽  
Box Girder ◽  
Pressure Coefficients ◽  
Smooth Flow ◽  
Maximum Value ◽  
Section Model ◽  
The Time Domain ◽  
Lock In

To investigate the spanwise correlation of vortex-induced forces (VIF) of a typical section of a streamlined box girder, wind tunnel tests of simultaneous measurement of force and displacement responses of a sectional model were conducted in a smooth flow. The spanwise correlation of VIF and pressure coefficients on the measurement points of an oscillating main deck were analyzed in both the time domain and frequency domain, respectively. The research results indicated that the spanwise correlation of VIF and pressure coefficients on the measurement points were related to the amplitudes of vortex-induced vibration (VIV), both of them weakened with the increase of spanwise distance; the maximum value of spanwise correlation coefficient is situated at the ascending stage of the lock-in region, rather than at the extreme amplitude point. The amplitudes of VIV showed different impacts on the spanwise correlation of pressure coefficients on the measurement points of the upper and lower surfaces, for which the maximum value of the spanwise correlation coefficients is located at the extreme amplitude point and the ascending stage of the lock-in region, respectively. Furthermore, the spanwise correlation of the pressure coefficients decreases continually from the upstream to downstream of the main deck; large coherence of vortex-induced forces and pressure appears around the frequency of vortex shedding, and the coherence of VIF and pressure becomes smaller with the increase in the spanwise distance.

Picosecond Photomodulation Study of Nanocrystalline Hydrogenated Silicon

1989 ◽  
Vol 164 ◽  
Author(s):  
M. Wraback ◽  
Lingrong Chen ◽  
J. Tauc ◽  
Z. Vardeny
Keyword(s):  
Light Intensity ◽  
Amorphous Phase ◽  
Temporal Resolution ◽  
Time Domain ◽  
Hydrogenated Silicon ◽  
High Illumination ◽  
Recombination Processes

AbstractWe have extended our photomodulation studies of nc-Si:H to the picosecond time domain. We measured the decays of photoinduced reflectivity with 100fs temporal resolution as a function of light intensity. Comparison with the data obtained on a-Si:H and c-Si indicates that ultrafast trapping and recombination processes are mainly the properties of the amorphous phase. It has also been observed that nc-Si:H is unstable under high illumination.

scholarly journals Ultra-Stable Molecular Sensors by Sub-Micron Referencing and Why They Should Be Interrogated by Optical Diffraction—Part I. The Concept of a Spatial Affinity Lock-in Amplifier

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 469
Author(s):  
Andreas Frutiger ◽  
Christof Fattinger ◽  
János Vörös
Keyword(s):  
Surface Plasmon Resonance ◽  
Spatial Frequency ◽  
Surface Plasmon ◽  
Time Domain ◽  
Plasmon Resonance ◽  
Optical Diffraction ◽  
Fourier Space ◽  
Label Free ◽  
Molecular Sensors ◽  
Lock In

Label-free optical biosensors, such as surface plasmon resonance, are sensitive and well-established for the characterization of molecular interactions. Yet, these sensors require stabilization and constant conditions even with the use of reference channels. In this paper, we use tools from signal processing to show why these sensors are so cross-sensitive and how to overcome their drawbacks. In particular, we conceptualize the spatial affinity lock-in as a universal design principle for sensitive molecular sensors even in the complete absence of stabilization. The spatial affinity lock-in is analogous to the well-established time-domain lock-in. Instead of a time-domain signal, it modulates the binding signal at a high spatial frequency to separate it from the low spatial frequency environmental noise in Fourier space. In addition, direct sampling of the locked-in sensor’s response in Fourier space enabled by diffraction has advantages over sampling in real space as done by surface plasmon resonance sensors using the distributed reference principle. This paper and part II hint at the potential of spatially locked-in diffractometric biosensors to surpass state-of-the-art temperature-stabilized refractometric biosensors. Even simple, miniaturized and non-stabilized sensors might achieve the performance of bulky lab instruments. This may enable new applications in label-free analysis of molecular binding and point-of-care diagnostics.

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