Optics and Photonics

Name of the course Online Lecture Exercises Lab
Optics and Photonics

The course Optics and Photonics is a twelve-weeks course, organized in ten modules. Its workload depends on the study program. The course offers virtual classroom lectures, exercises and laboratory. The training introduces the basic theory in optics as shown in the table below.

There are no preliminaries in Optics required but a solid base knowledge in math, i.e. vector algebra and vector differential calculus is absolutely mandatory. Participants apply the content in theoretic and programming exercises with Matlab (Octave) or C/C++.

To foster a culture of scientific discourse and train presentation skills, each participant is supposed to give a 5-10 min online presentation on one of the topics shown in the table below. The course is completed by a written or oral examination at the end of a semester.

Having completed the course successfully, students understand the basic principles of Optics and Photonics. The course is recommended but not necessarily a foundational course for the Silicon Photonics Laboratory or the Electromagnetic Simulation Laboratory.



Example: Grin Lens vs. Spheric Lens





Content

Modules Content Script Exercise
1 History of Optics [PDF] [PDF]
1 Electromagnetic theory of light [PDF] [PDF]
2 Light and matter [PDF] [PDF]
3 Electromagnetic energy [PDF] [PDF]
4 Ray optics [PDF] [PDF]
5 Fourier optics [PDF] [PDF]
6 Diffraction theory [PDF] [PDF]
7 Fourier simulation methods [PDF] [PDF]
8 Finite difference approximation methods [PDF] [PDF]
9 FDTD method [PDF] Lab**
10 Silicon photonics [PDF] Lab**
11* Lasers [PDF] -
* optional module
** lab exercise on the FDTD and VWPM method using the free simulators MEEP and VWPM


Essays

No. Title PDF
1 Theory of waves [PDF]
2 Paraxial Helmoltz equation [PDF]
3 Approximation of the material equations [PDF]
4 Dispersion equation from newtonian mechanics [PDF]
5 Energy flux [PDF]
6 Local and total absorption [PDF]
7 Electromagnetic waves in metals [PDF]
8 Vector field in single layer [PDF]
9 Planar and spherical mirror [PDF]
10 Resolution criteria of imaging systems [PDF]
11 Cylindrical aperture function [PDF]
12 Fraunhofer diffraction [PDF]
13 Geometric construction of single slit diffraction patterns [PDF]
14 Free space propagation and Weyl's formula [PDF]
15 Debye theory [PDF]
16 Electromagnetic scattering [PDF]
17 Fresnel and Fraunhofer approximation from rigorous diffraction theory [PDF]


Matlab exercises

Ray propagation can be described with the ABCD-matrix paradigm where a linear propagation is assumed in alignment with ray optics. Students develop Matlab code to simulate propagation through homogeneous media and lenses of various types. The relevant transformation matrices are introduced in the lectures.

Students analyse propagation paths and the formation of images. The correspondence of a pupil function (limit the aperture) to the depth of focus and the intensity of image points examined.

Reflectivity, Transmittivity and Absorptance is analysed with Matlab. Students program Matlab to simulate the energy characteristics of a single layer Fabry-Perot resonator from an infinite number of reflections and draw the characteristic curves. The correspondence of the curves to anti-reflection coatings, coatings with maximum transmission and absorption is investigated.





The correspondence of spatial frequencies to angles of propagation is investigated with Matlab. Students are trained to interpret the spectrum of electromagnetic field distributions and understand the theory in context of image filtering. The exercise provides the foundation for Fourier-based simulation methods like the Beam Propagation Method, Wave Propagation Method and the Vector Wave Propagation Method.


Spectral analysis of field distributions like Gaussian beams shows that propagated field distributions are obtained from a propagation of modes. Students program a two-dimensional scalar version of the WPM and BPM. The code will be extended to simulate the propagation of electromagnetic scalar waves through lens systems. Students are encouraged to extend the scalar version to the vector version and the two-dimensional to a three-dimensional version but this is advanced and not part of the regular course content.

Matlab, C/C++ and Delphi sources for three-dimensional, vector and bidirectional propagation are available and will be used to compare the results from FDTD to the results from Fourier-based simulators and perform a mode analysis. Preliminaries for the Matlab exercises are a base knowledge and experience in programming with Matlab. Simulink is not needed in this context.




Literature

[1] Principles Of Optics, Born & Wolf, Cambridge University Press, ISBN 0-521-64222-1
[2] Fourier Optics, Goodman, Roberts Publ., ISBN 0-974-70772-4
[3] The Finite-Difference Time-Domain Method, Taflove, Artech House Inc., ISBN 1-580-53832-0
[4] Engineering Optics With Matlab, Poon & Kim, World Scientific Publ. Co, ISBN 9-789-812-56873-1
[5] Optics, Hecht, Addison-Wesley Publ., ISBN 9-780-805-38566-3