Teaching & Software


Andreas Dahlin

Disclaimer:

This is a personal webpage created by me. It does not necessarily reflect the opinions and policies of the University I am affiliated with.


Copyright ©

Andreas B. Dahlin

Teaching Material

Surface Engineering (KPO041)

Lecture slides (continuously updated):

Introduction to Surface Forces

Binding Kinetics

Surface Sensitive Techniques

Polymer Brushes

Polymer Interfaces and Applications

Previous exams:

Exam 2018

Exam 2019

Biological and Biotechnical Physics (TIF315)

My material:

Molecular Interactions and Binding Kinetics

Surface Sensitive Techniques

Home assignments

Soft Matter Physics (TIF015) - Discontinued

My lectures:

Introduction to Soft Matter

Phase Transitions: Equilibrium

Phase Transitions: Kinetics

Colloids: Dilute Dispersions and Charged Interfaces

Colloids: Concentrated Dispersions and Rheology

Self Assembly

Polymers: The Size of a Coil

Polymers: In Solvents and on Surfaces

Polymers: Melts, Crystals, Mixtures and Gels

Polymers: Mechanical Properties and Rheology

Soft Matter in Biology

My previous Home Assignments with solutions:

HA2 2017

HA2 2016

HA1 2015

HA2 2014

HA3 2014

HA2 2013

My previous exam questions with answers:

Reexam 2019

Exam 2018

Reexam 2018

Exam 2017

Reexam 2017

Exam 2016

Reexam 2016

Exam 2015

Reexam 2015

Exam 2014

Reexam 2014

Second reexam 2014

Exam 2013

Reexam 2013

Second reexam 2013

Biotechnical Physics (TIF040) - Discontinued

My lectures:

Introduction and Biosensors Overview

Thermodynamics and Calorimetry

Kinetics of Biomolecular Interactions

Plasmonic Biosensors

Electrophoresis Techniques

Optical Biophysical Techniques

My lab exercise manual:

Build Your Own Optical Biosensor

My exam questions (with answers):

Exam 2016

Exam 2015

Exam 2014

Exam 2013

Kemi och Material (KBT290)

Mina föreläsningar om "nanomaterial" (uppdateras kontinuerligt):

Mjuka material och reologi

Porösa material och kemiska ytmodifieringar

Tillverkning av nanostrukturer och platta material

Atomkraftsmikroskopi

Tidigare tentafrågor:

Tenta 2019

Tenta 2018

Omtenta 2018

Tenta 2017

Omtenta 2017

Omomtenta 2017


Fysikingenjörens Verktyg (TIF275)

Mitt främsta bidrag till kursen är att jag gjorde det mesta av arbetet med att utveckla de så kallade Universeumprojekten. Studenterna ska i grupper arbeta med att förstå och beskriva i text fysiken bakom något fenomen man kan komma i kontakt med på Universeum, Skandinaviens största "science center".

Här finns beskrivningar till Universeumsprojekten 2014: Universeumprojekt

Matlab Programs

TransferMatrix.m

This program calculates the transmission, reflection and absorption in an arbitrary thin film multilayer system.

Download the MATLAB file here: TransferMatrix3.m

The figure shows the result generated by the program when run as is. In this case, it generates the far field angular spectrum (670 nm incident light) of a 50 nm gold film on glass in water. The surface plasmon excitation is seen as a dip in the reflection. The simulation also includes a dielectric coating on the gold film (n = 1.4) with different thickness (hence the series of graphs). This can be thought of as a simulation of a plasmonic biosensor system.

The TransferMatrix program can be used to simulate transmission through and reflection from any kind of thin film multilayer - just change the parameters in the beginning of the file! You can also change to a wavelength spectrum at a fixed angle of incidence. If a material is dispersive you should just include a new refractive index calculation in the wavelength loop.

I use the TransferMatrix program to simulate the transmission of light through my thin film multilayers. Although the program naturally does not consider the precense of pores in the layer it still gives a good estimate of peaks and dips due to Fabry-Perot interference and simplifies interpretation of experimental spectra of nanopore arrays.

You are free to use the MATLAB code for any purpose but please cite the reference: J. Junesch, T. Sannomiya, A.B. Dahlin, ACS Nano 2012. The supporting information for this paper describes the calculations.

SurfaceWavesTM.m

This program calculates the dispersion relation for transverse magnetic surface waves in an arbitrary thin film multilayer system.

Download the MATLAB file here: SurfaceWavesTM6.m

This program can be user configured as the transfer matrix calculations. When used as is, it will calculate the dispersion relation of hybridized surface plasmon modes in a metal-insulator-metal system (20 nm Au on both sides of a 50 nm n = 2.24 dielectric in air). The figure below shows the results of solving for the higher energy hybridized bonding mode. The plots generated are for dispersion, propagation length and fields. (The magnetic field gives a 1D plot for TM modes while the electric field is more complicated to visualize since it has two components.)

The algorithm solves the equations by finding the real and imaginary parts of the k vector by minimization. The program starts with generating a plot of the numerical residual for different values of the k initial guess. You should click in the plot at a location where you see a minimum. Different minima correspond to different modes.

You are free to use the MATLAB code for any purpose but please cite a suitable reference like: A.B. Dahlin, M. Mapar, K. Xiong, F. Mazzotta, F. Höök, T. Sannomiya, Advanced Optical Materials 2014. The supporting information for this paper describes the calculations in detail.