Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Brightness perception (1)
- Couplings (1)
- Deconvolution (1)
- Electromagnetic waves (1)
- Grating Couplers (1)
-
- Image intensifiers (1)
- Image reconstruction techniques (1)
- Integrated circuits (1)
- Light (1)
- Optical images (1)
- Optical wave guides (1)
- Phase retrieval (1)
- Phase-contrast microscopy (1)
- Photomicrography (1)
- Photonics (1)
- Reconstruction algorithms (1)
- Silicon (1)
- Spatial frequency (1)
- Systems on a chip (1)
- Transport of intensity (1)
Articles 1 - 2 of 2
Full-Text Articles in Physics
Illumination Modulation For Improved Propagation-Based Phase Imaging, Tonmoy Chakraborty
Illumination Modulation For Improved Propagation-Based Phase Imaging, Tonmoy Chakraborty
Legacy Theses & Dissertations (2009 - 2024)
Propagation-based phase imaging enables the quantitative reconstruction of a light beam's phase from measurements of its intensity. Because the intensity depends on the time-averaged square of the field the relationship between intensity and phase is, in general, nonlinear. The transport of intensity equation (TIE), is a linear equation relating phase and propagated intensity that arises from restricting the propagation distance to be small. However, the TIE limits the spatial frequencies that can be reliably reconstructed to those below some cutoff, which limits the accuracy of reconstruction of fine features in phase. On the other hand, the low frequency components suffer …
Photonic Grating Coupler Designs For Optical Benching, Eng Wen Ong
Photonic Grating Coupler Designs For Optical Benching, Eng Wen Ong
Legacy Theses & Dissertations (2009 - 2024)
Background: Silicon Photonics has been rapidly developing as a field. The primary reason for this is its lower operating costs and faster switching rates for use in big data centres. Instead of microns-wide copper lines to transmit signals, silicon photonic chips use waveguides, usually of silicon or silicon nitride. Photonic signals bypass the issues of resistive-capacitance lag (RC-lag) and resistive-heating encountered by copper lines. Additionally, a single waveguide may transmit multiple signals along different carrier wavelengths.