Time reversed optical waves by arbitrary vector spatiotemporal field generation (Technical audience)

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"Time reversed optical waves by arbitrary vector spatiotemporal field generation"
Mickael Mounaix, Nicolas K. Fontaine, David T. Neilson, Roland Ryf, Haoshuo Chen, Juan Carlos Alvarado-Zacarias and Joel Carpenter
doi.org/10.1038/s41467-020-19...
Technical Video Table of Contents {minutes:seconds}
Basic principles and examples of time reversal
00:32 Time reversal in water waves
02:39 Time reversal in acoustics
03:13 Time reversal in microwaves
03:53 Focusing through scattering objects
Previous work on extending time reversal techniques into optics
05:08 Frequencies and bandwidth of optics
06:01 Spatial-only control
07:47 Space-time coupling in scattering media
09:36 Existing types of wave control in optics (spatial, temporal, spectral etc)
11:52 Time-domain spatiotemporal field generation (acoustics/microwaves and the difficulty of optics)
13:06 Frequency-domain spatiotemporal field generation
Device details and applications
14:00 Device principles of operation
18:51 1D-to-2D transformation by MPLC
19:40 Device as ultrafast wavefront generator
21:02 Advantage of Hermite-Gaussian spatial basis over 2D spot array
21:21 Device as volumetric hologram
21:54 Arbitrary spatiotemporal field generation and its applications
24:16 Detailed schematic walk-through
Characterisation apparatus
25:41 Measurement of the transfer matrices, summary
25:54 Fibre-under-test
26:25 Measurement of the transfer matrices, detailed
28:48 Backpropagation
29:31 Spatiotemporal characterisation of states
Phase mask calculation
31:18 Calculation of phase masks using Gerchberg-Saxton
Experimental results
34:59 Preamble
35:42 Spatiospectral (Letters vs. Frequency)
37:07 Spatiotemporal focus (focused spot(s) at defined delay)
38:15 Smileotemporal focus (smiley face at defined delay)
38:45 Radially polarised beam
39:07 Spiral trajectory
39:33 Raster scanning
41:08 Clocks
42:55 Numerals
43:12 LG modes
43:55 "Arrow of time"
46:00 "Eiffel tower"
Characterisation of device performance
46:49 Preamble
47:49 Insertion loss and mode-dependent loss
52:54 Time reversal operators, best and worst
54:20 Differential mode and frequency loss
55:46 Total impulse response
56:52 Delay-dependent loss
59:29 Spectral DFT test (stress test)
Future scaling of spatiotemporal performance
69:12 Alternate designs and improvements

[@BandhanGoyal]

It's even more remarkable that the author communicated his research to the public. Commendable work! Great talk.

[@ChurchOfThought]

Great explanation, amazing work. Thank you Joel et al!

[@simonellis4815]

Amazing work, and a great video, thanks.

[@SHERMA.]

what can you tell us about phase conjugate mirrors? what can you tell us about how this tech changed the DEW industry?

[@upsty6499]

❣️ phenomenal.

[@upsty6499]

I understand. Wow 😳

[@yuanhangzhang9555]

Thank you for making such a great talk! How you made these fancy animations?

[@joelacarpenter]

I hand draw every frame with a quill :)

[@luochenghuang7538]

@@joelacarpenter I admire your penmanship!

[@BandhanGoyal]

@@joelacarpenter Is it possible to make a video on how all these animations were made so other researchers can follow the path, making science communication easier and more available?