Just a small note!

Hi folks, I just realized I haven’t posted for a while, but there’s a good reason — I’m in the final month of finishing up a new textbook, which is due on August 15, so all of my writing energy is going there! Once that gets finished, I will get back to a more consistent blogging schedule. I might drop a couple of short posts before then, depending on my mood.

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Memories of Emil Wolf

2024 marks the 65th anniversary of a significant milestone in optics: the publication of Principles of Optics by Max Born and Emil Wolf, a comprehensive book on physical optics that has been cited some 78,000 times in the scientific literature according to Google Scholar. The book went through seven editions before the passing of both coauthors, with the seventh expanded edition released by Cambridge University Press in 1999. It is a scientific book influential enough to have its own Wikipedia page.

The first edition of Principles of Optics, released in 1959, was a completely expanded and revised edition of Max Born’s own optics book, Optik, that had only appeared in German. Born was close to retirement age, and he enlisted the aid of a bright young PhD of Czech descent, Emil Wolf, to help him with the work. Wolf at that time was very interested in the field of optical coherence, i.e. how the statistical properties of light influence its observable properties, and he pushed to include a chapter on coherence in the book. This turned out to be a very fortuitous decision, as the first laser was invented in 1960, and coherence theory was crucial for understanding the properties of this strange new source of light. This helped catapult Principles of Optics into being perhaps the book on the fundamentals of optical physics for the next 60-plus years.

To commemorate this anniversary, Optics & Photonics News released a retrospective article on the writing of the book and its revision in 1999 (subscription required, alas). The author Patricia Daukantas, reached out to me for some of my thoughts on the 1999 edition, as I was a student of Emil Wolf at that time. I also provided a few high-resolution photos of Emil and his students that I had in my possession. Only one of them was used in the final article, so I thought I would share them here and a few words about each.

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RIP Zoe, 2006-2024

It’s taken me a few days to write this post, as this hit me really hard. Two Tuesdays ago, June 4th, I had to say goodbye to my eldest cat Zoe. It has been such a hard loss that it has taken me this long to feel okay even writing a memorial post for her.

Zoe in 2010.

The night that we let her go, there was a powerful thunderstorm and the power went out. To me, it was as if the heavens themselves had opened up at Zoe’s passing.

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Horrorstör, by Grady Hendrix

Book 7 of my 26 books for 2024 goal! Getting closer to catching up.

Okay, so this is one of those books that I’ve meant to read for years and never quite got around to! I came close about a year ago, when I finally broke down and bought a copy… however, I left it on the floor next to the couch and a cat managed to puke on it. I only got around to getting a new copy a couple of months ago, and have finally read it.

The book in question is Horrorstör, by Grady Hendrix.

As is clear from the title and the image, Horrorstör is a haunted house story set in what amounts to an Ikea! It is a quite entertaining story, though I wouldn’t exactly refer to it as “horror comedy” as it is referred to on Wikipedia.

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Just because

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Frankenstein, by Mary Shelley

Book 6 of my 26 books for 2024 goal! Way behind in reading now due to life, but working on it.

One of my big hangups in life is that I suffer from “already seen it” syndrome, as I just made up a name for it: if a story has permeated the public consciousness sufficiently and I am even familiar with a bastardized version of it, I am very unmotivated to visit the source material.

For this reason, in part, I had never gotten around to reading the novel that largely launched modern science fiction and horror, Mary Shelley’s Frankenstein. The other reason I had never gotten around to reading it is because the printed versions of it, being an old public domain novel, have largely been very cheap and disposable, and I like pretty books.

But check out this Union Square & Co. deluxe edition!

This gorgeous edition includes lovely illustrations by John Coulthart, and finally convinced me to read the book.

There probably isn’t that much I can say about such a famous, hyper-analyzed book that hasn’t been said before, so I’ll share a few of my random observations.

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Robert Williams Wood and the mystery of anomalous dispersion (1901)

I’ve been hard at work in recent months on a new textbook on electromagnetic waves, and that has led me to dig deep into understanding a number of subjects, and their history, that I have only really casually considered in the past. One topic that jumped out at me is the phenomenon of so-called “anomalous” dispersion. This name indicates that it is different from “normal” dispersion, which is the phenomenon that causes a prism to break up white light into a rainbow, as illustrated on Pink Floyd’s Dark Side of the Moon album cover:

Pink Floyd’s Dark Side of the Moon album cover, showing the principle by which the spectrum of light is generated.

In a prism, the angle at which light is refracted by the glass depends on the frequency of light, i.e. its color. In normal dispersion, the higher frequency light (blue and violet) is refracted more strongly than the lower frequency light (red and yellow). In anomalous dispersion, roughly the opposite happens: lower frequencies are refracted more than higher frequencies!

I thought it would be fun to talk a bit about the history of anomalous dispersion, which gets at some of the physics of matter, and also allows me to share lots of pretty pictures taken by Robert Williams Wood, who studied the phenomenon in the early 1900s!

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Posted in History of science, Optics, Physics | 1 Comment

Me, talking falling felines in LiveScience!

Recently, I was interviewed for a LiveScience article about how cats land on their feet, and the article came out today! Here is the link for those who are interested in hearing me talk falling felines, yet again!

PS just a little reminder that my book on Falling Felines and Fundamental Physics is still out there, as is my more recent book on Invisibility!

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Invisibility audiobook 60% off!

Hi all, I’ve been rather overwhelmed with work lately (two PhD students defended, working on a textbook draft that is due in a few months, etc.), so I’ve been quite quiet here. I’ve got a few posts in the works, but I wanted to note that the audiobook version of Invisibility is 60% off at Audiobooks.com until May 10th!

I will be back in the near future with some more science and fiction blog posts.

PS: In case you’re wondering, I still get full royalties on the book even though it’s on deep discount!

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Fearful Implications, by Ramsey Campbell

Book 5 of my 26 books for 2024 goal! Still behind in my reading, but have another that I will finish within a few days.

It doesn’t take me very long to read anything new by Ramsey Campbell — assuming I am aware that something has been released! As longtime readers of this blog are probably aware, Campbell is my favorite horror author, and one who in my opinion really demonstrates the literary potentials of horror. His writing is precise and subtle, and he is a master at conveying a mood with a careful choice of words.

So when I saw Fearful Implications, his latest compilation of short stories, had been released in 2023, it didn’t take me long to get it.

Before I talk about the stories, let me give a shoutout to the cover art by Ilan Sheady, which is clearly an homage to Henry Fuseli’s famous 1781 painting The Nightmare!

This is particularly apropos, because one of the stories in the collection is about fears of inadvertently copying the works of others! (Incidentally, read the linked Wikipedia article about The Nightmare, which may have inspired in turn some of the greatest writers of horror in history.)

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