From 6c1fac88d21768c566b7d7e9e0163bcd4d669c81 Mon Sep 17 00:00:00 2001 From: Kyle Douglass Date: Thu, 26 Oct 2023 10:33:26 +0200 Subject: [PATCH] Add basic description of fluorescence --- figures/two-state-jablonski-diagram/README.md | 1 + .../two-state-jablonski-diagram.svg | 336 ++++++++++++++++++ .../figures/two-state-jablonski-diagram.png | Bin 0 -> 68552 bytes texts/smlm-lab-course/smlm-lab-manual.tex | 35 ++ 4 files changed, 372 insertions(+) create mode 100644 figures/two-state-jablonski-diagram/README.md create mode 100644 figures/two-state-jablonski-diagram/two-state-jablonski-diagram.svg create mode 100644 texts/smlm-lab-course/figures/two-state-jablonski-diagram.png diff --git a/figures/two-state-jablonski-diagram/README.md b/figures/two-state-jablonski-diagram/README.md new file mode 100644 index 0000000..198a1d2 --- /dev/null +++ b/figures/two-state-jablonski-diagram/README.md @@ -0,0 +1 @@ +Jablonski diagram of a fluorophore. Absorption of a photon causes a transition from the ground (S0) state to the excited (S1) state on time scales of roughly 1e-15 seconds. The fluorophore then relaxes through several closely-spaced vibrational states on time scales of approximately 1e-12 seconds. From there, the fluorophore can decay back to the ground state. If it is a radiative decay, then a photon is emitted. Due to the energy lost during internal conversion, its wavelength is longer than the wavelength of the incident photon. Alternatively, the fluorophore can lose energy through non-radiative means. The average time spent in the excited state is typically on the order of 1e-9 seconds. diff --git a/figures/two-state-jablonski-diagram/two-state-jablonski-diagram.svg b/figures/two-state-jablonski-diagram/two-state-jablonski-diagram.svg new file mode 100644 index 0000000..913a63b --- /dev/null +++ b/figures/two-state-jablonski-diagram/two-state-jablonski-diagram.svg @@ -0,0 +1,336 @@ + + + + + Jablonski diagram of a fluorophore. + + + + + + + + + + + + + + + + + + + + + + + + + + S0 + S1 + + + + + + + + + + + Absorption + InternalConversion + RadiativeDecay + Non-radiativeDecay + + + Energy + + + + + + + + + + + Kyle M. Douglass + + + + English + Jablonski diagram of a fluorophore. + Absorption of a photon causes a transition from the ground (S0) state to the excited (S1) state on time scales of roughly 1e-15 seconds. The fluorophore then relaxes through several closely-spaced vibrational states on time scales of approximately 1e-12 seconds. From there, the fluorophore can decay back to the ground state. If it is a radiative decay, then a photon is emitted. Due to the energy lost during internal conversion, its wavelength is longer than the wavelength of the incident photon. Alternatively, the fluorophore can lose energy through non-radiative means. 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This is called fluorescence. An important question is: given incident light of a certain irradiance (in units of photons per area per time), what will be the rate of fluorescent photon emission? + +Let's first consider a simple model for a fluorophore: a system of two sets of states separated by an energy barrier. This model is illustrated in \autoref{fig:two-state-jablonski}. Absorption of a photon causes a transition from the ground ($S_0$) state to the excited ($S_1$) state on time scales of roughly $10^{-15}$ seconds. The fluorophore then relaxes through several closely-spaced vibrational states on time scales of approximately $10^{-12}$ seconds. From there, the fluorophore can decay back to the ground state. If it is a radiative decay, then a photon is emitted. Due to the energy lost during internal conversion, its wavelength is longer than the wavelength of the incident photon. Alternatively, the fluorophore can lose energy through non-radiative means. The average time spent in the excited state is typically around $10^{-9}$ seconds, though there is significant variation in this value across fluorophores. + +\begin{figure} + \centering + \includegraphics[width=0.9\textwidth]{two-state-jablonski-diagram.png} + \caption{Jablonski diagram of a fluorophore.} + \label{fig:two-state-jablonski} +\end{figure} + +From \autoref{fig:two-state-jablonski}, we can see that three different processes primarily determine the rate of fluoresence emission: absorption, radiative and non-radiative decay. The rate of absorption is given by + +\begin{equation} + \kappa_a = \sigma I +\end{equation} + +\noindent where $\sigma$ is the absorption cross section of the fluorophore and $I$ is the intensity of the incident light. The absorption cross section has units of area and represents the probability that a photon will be absorbed by the fluorophore. Additionally, the decay rate from the excited state is the sum of the radiative and non-radiative decay rates: + +\begin{equation} + \kappa_e = \kappa_r + \kappa_{nr} +\end{equation} + +The inverse of the rate coefficients are called lifetimes. In particular, $\tau_{fl} = 1 / \kappa_r$ is called fluorescence lifetime and represents the average amount of time it takes for a fluorophore in the excited state to undergo a radiative decay. It is an important quantity in characterizing a fluorophore. + +Finally, let $Q$, called the quantum yield, represent the fractional number of fluorophores that undergo a radiative decay. It can be shown that the number of photons emitted per unit time $\phi$ by a single fluorophore is related to these quantities through the expression + +\begin{equation} + \phi \left( I \right) = \frac{\sigma Q I} {1 + \sigma Q \tau_{fl} I } +\end{equation} + +\noindent At low values of the $I$, the fluorescent photon flux is approximately linear with $I$. However, once $I$ becomes approximately equal to $I_s = 1 / \left( \sigma Q \tau_{fl} \right)$, the fluorescent photon flux saturates and becomes independent of $I$. For this reason, $I_s$ is known as the saturation irradiance. + \section{Energetic States of Fluorophores} The most important mechanism to achieving super-resolution with SMLM is the ON/OFF switching of fluorophores. Activating only a sparse subset of fluorophores in the ON state at a given time allows us to localize individual fluorophores and, over time, build up a pointilist-like reconstruction of the object.