Put a logo next to author's name

Question

I wish to add a logo using \includegraphics in case a certain information is available.

I use the article class with the package authblk and put in the preamble:

\author[affiliation logo]{first lastName}

where logo should be an image. Ultimately, the logo will be wrapped in a \href command (but that part does not seem to create problem).

When I replace logo with

\includegraphics[width=0.4cm]{L-orcid}

I get the error message

! Use of \\author doesn't match its definition.
\new@ifnextchar ...served@d = #1\def \reserved@a      {
#2}\def \reserved@b {#3}\f...

Here is a complete example showing the problem:

\documentclass{article}

\usepackage{graphicx}
\usepackage{authblk}
\renewcommand\Affilfont{\fontsize{9}{10.8}\selectfont}

\title{adf}
\author[a, \includegraphics[width=0.4cm]{L-orcid}]{denis cousineau}
\affil[a]{my place}

\begin{document}

\maketitle

Some text...

\end{document}

Answer 1

For one thing, you can't use an optional argument within an optional argument, unless it is group-isolated. For another thing, \includegraphics must be protected in this context.

\documentclass[landscape]{article}

\usepackage{graphicx}
\usepackage{authblk}
\renewcommand\Affilfont{\fontsize{9}{10.8}\selectfont}

\title{adf}
\author[{a, \protect\includegraphics[width=0.4cm]{example-image}}]{denis cousineau}
\affil[a]{my place}

\begin{document}

\maketitle

Some text...

\end{document}