00516nas a2200181 4500008004100000020000900041245006200050210005800112300001200170490000900182653000700191653000700198100002400205700002100229700001800250700002400268856004200292 2022 eng d anull00aHow to Build the ``Optical Inverse'' of a Multimode Fibre0 aHow to Build the Optical Inverse of a Multimode Fibre a98160260 v202210aKF10aMF1 aBūtaitė, Unė, G.1 aKupianskyi, Hlib1 aCizmar, Tomas1 aPhillips, David, B. uhttps://doi.org/10.34133/2022/981602600713nas a2200229 4500008004100000022001400041245008000055210006900135260001100204300000700215490000700222653000700229653000700236100001500243700002200258700002000280700002300300700002100323700001800344700002400362856009700386 2021 eng d a2047-753800aCompressively sampling the optical transmission matrix of a multimode fibre0 aCompressively sampling the optical transmission matrix of a mult cAPR 21 a880 v1010aKF10aMF1 aLi, Shuhui1 aSaunders, Charles1 aLum, Daniel, J.1 aMurray-Bruce, John1 aGoyal, Vivek, K.1 aCizmar, Tomas1 aPhillips, David, B. uhttps://www.isibrno.cz/cs/compressively-sampling-optical-transmission-matrix-multimode-fibre01569nas a2200205 4500008004100000022001400041245006800055210006800123300000900191490000700200520099500207653000701202653000701209100001501216700002601231700001701257700001801274700002401292856004701316 2021 eng d a2041-172300aMemory effect assisted imaging through multimode optical fibres0 aMemory effect assisted imaging through multimode optical fibres a37510 v123 a

When light propagates through opaque material, the spatial information it holds becomes scrambled, but not necessarily lost. Two classes of techniques have emerged to recover this information: methods relying on optical memory effects, and transmission matrix (TM) approaches. Here we develop a general framework describing the nature of memory effects in structures of arbitrary geometry. We show how this framework, when combined with wavefront shaping driven by feedback from a guide-star, enables estimation of the TM of any such system. This highlights that guide-star assisted imaging is possible regardless of the type of memory effect a scatterer exhibits. We apply this concept to multimode fibres (MMFs) and identify a `quasi-radial' memory effect. This allows the TM of an MMF to be approximated from only one end - an important step for micro-endoscopy. Our work broadens the applications of memory effects to a range of novel imaging and optical communication scenarios.

10aKF10aMF1 aLi, Shuhui1 aHorsley, Simon, A. R.1 aTyc, Tomáš1 aCizmar, Tomas1 aPhillips, David, B. uhttps://doi.org/10.1038/s41467-021-23729-101337nas a2200205 4500008004100000022001400041245006800055210006600123300000800189490000600197520075000203653000700953653000700960653000700967100002000974700002300994700002401017700002501041856006501066 2020 eng d a2296-424X00aEntropy Production in an Elementary, Light Driven Micro-Machine0 aEntropy Production in an Elementary Light Driven MicroMachine a5380 v83 a

We consider the basic, thermodynamic properties of an elementary micro-machine operating at colloidal length scales. In particular, we track and analyze the driven stochastic motion of a carefully designed micro-propeller rotating unevenly in an optical tweezers, in water. In this intermediate regime, the second law of macroscopic thermodynamics is satisfied only as an ensemble average, and individual trajectories can be temporarily associated with decreases in entropy. We show that our light driven micro-propeller satisfies an appropriate fluctuation theorem that constrains the probability with which these apparent violations of the second law occur. Implications for the development of more complex micro-machines are discussed.

10aKF10aLF10aMF1 aBox, Stuart, J.1 aAllen, Michael, P.1 aPhillips, David, B.1 aSimpson, Stephen, H. uhttps://www.frontiersin.org/article/10.3389/fphy.2020.593122
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