Marlan O. Scully

Baylor University, Waco, Texas, United States

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Publications (512)1527.08 Total impact

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    ABSTRACT: Currently, no light source exists which is both narrow-band and speckle-free with sufficient brightness for full-field imaging applications. Light emitting diodes (LEDs) are excellent spatially incoherent sources, but are tens of nanometers broad. Lasers on the other hand can produce very narrow-band light, but suffer from high spatial coherence which leads to speckle patterns which distort the image. Here we propose the use of random Raman laser emission as a new kind of light source capable of providing short-pulsed narrow-band speckle-free illumination for imaging applications.
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    ABSTRACT: Monte Carlo techniques are the gold standard for studying light propagation in turbid media. Traditional Monte Carlo techniques are unable to include wave effects, such as diffraction; thus, these methods are unsuitable for exploring focusing geometries where a significant ballistic component remains at the focal plane. Here, a method is presented for accurately simulating photon propagation at the focal plane, in the context of a traditional Monte Carlo simulation. This is accomplished by propagating ballistic photons along trajectories predicted by Gaussian optics until they undergo an initial scattering event, after which, they are propagated through the medium by a traditional Monte Carlo technique. Solving a known problem by building upon an existing Monte Carlo implementation allows this method to be easily implemented in a wide variety of existing Monte Carlo simulations, greatly improving the accuracy of those models for studying dynamics in a focusing geometry.
    Optics Express 04/2015; 23(7). DOI:10.1364/OE.23.008699 · 3.53 Impact Factor
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    ABSTRACT: We demonstrate an approach to detect low wavenumber vibrational signals based on single-beam coherent anti-Stokes Raman scattering (CARS) with a spectral hole. Using a 4f pulse shaper for both pulse shaping and signal collection, we achieve an enhanced efficiency in collecting back-reflected CARS signals.
    Optics Letters 04/2015; 40(7). DOI:10.1364/OL.40.001223 · 3.18 Impact Factor
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    ABSTRACT: We demonstrate an approach to detect low wavenumber vibrational signals based on single-beam coherent anti-Stokes Raman scattering (CARS) with a spectral hole. Using a 4f pulse shaper for both pulse shaping and signal collection, we achieve an enhanced efficiency in collecting back-reflected CARS signals.
    Optics Letters 04/2015; 40(7):1223-6. · 3.18 Impact Factor
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    Dataset: books
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    ABSTRACT: Spatially Offset Raman Spectroscopy (SORS) has seen considerable interest in recent years as a tool for noninvasively acquiring Raman spectra from beneath the surface of a sample. One of the major limitations of the SORS technique is that accurate knowledge of the optical properties of the medium is required to translate an offset into a sample depth. We report on the benefits of preforming SORS using micron offset distances as opposed to the more typical millimeter offsets used. Monte Carlo simulations are used to demonstrate that at these small offsets, the results depend less on the scattering coefficient of the material. These results provide new insights into the SORS technique and will improve the practical application of SORS in the future.
    Journal of Modern Optics 01/2015; 62(2). DOI:10.1080/09500340.2014.976598 · 1.17 Impact Factor
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    ABSTRACT: Amplified ultrashort laser pulses are useful in many fields of science and engineering. Pushing the frontiers of ultrashort pulse generation will lead to new applications in biomedical imaging, communications and sensing. We propose a new, quantum approach to ultrashort pulse generation using transient quantum coherence which predicts order of magnitude stronger pulses generated with lower input energy than in the steady-state regime, reducing the practical heating limitations. This femtosecond quantum-coherent analog of nanosecond Q-switching is not limited by the pulse duration constraints of the latter, and, in principle, may be used for a variety of lasers including x-ray and plasmon nanolasers. We apply this approach to generation of giant plasmon pulses and achieve quantum control of plasmon relaxation dynamics by varying the drive pulse delay, amplitude and duration. We provide insights into the control mechanisms, and discuss future implementations and applications of this new source of ultrashort nanooptical fields.
    Physical Review A 10/2014; 91(4). DOI:10.1103/PhysRevA.91.043844 · 2.99 Impact Factor
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    ABSTRACT: Spasers have been theoretically predicted and experimentally observed and promise to deliver new exciting nanophotonic and biomedical applications. Here we theoretically investigate ultrafast dynamical properties of spasers with external plasmonic feedback. We consider a spaser both as a nanoscale source and detector of plasmons which could be used to design novel nano-imaging and sensing techniques. We show that, as with conventional lasers, spasers are sensitive to external feedback. However, unlike the lasers, spasers have faster relaxation dynamics which could be used to develop new ultrasensitive near field imaging techniques. We investigate the dependence of spaser relaxation oscillations on feedback parameters and show that quantum coherence can be used to increase the sensitivity to feedback.
    Journal of optics 10/2014; 16(11). DOI:10.1088/2040-8978/16/11/114013 · 2.01 Impact Factor
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    ABSTRACT: We study backward cooperative emissions from a dense sodium atomic vapor. Ultrashort pulses produced from a conventional amplified femtosecond laser system with an optical parametric amplifier are used to excite sodium atoms resonantly on the two-photon 3S–4S transition. Backward superfluorescent emissions (BSFEs), both on the 4S–3P and 4S–3P transitions, are observed. The picosecond temporal characteristics of the BSFE are observed using an ultrafast streak camera. The power laws for the dependencies of the average time delay and the intensity of the BSFEs on input power are analyzed in the sense of cooperative emission from nonidentical atomic species. As a result, an absolute (rather than relative) time delay and its fluctuations (free of any possible external noise) are determined experimentally. The possibility of a backward swept-gain superfluorescence as an artificial laser guide star in the sodium layer in the mesosphere is also discussed.
    New Journal of Physics 10/2014; 16(10):103017. DOI:10.1088/1367-2630/16/10/103017 · 3.67 Impact Factor
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    ABSTRACT: Peaks, dips, and intermediate line shapes have been observed in surface-enhanced coherent Raman spectroscopy. Here, we report an experimental observation of a peculiar line shape revealing both a peak and a dip as two vibrational transitions of pyridazine in the presence of aggregated gold nanoparticles. We propose a simple model based on plasmonic phase effects and quantum chemistry calculations, and compare the simulated coherent (SECARS) and incoherent (SERS) Raman signals from several complexes. Complex SECARS line shapes provide additional information compared to SERS and can be used as a tool in nanoscale sensing and spectroscopy.
    Journal of Modern Optics 09/2014; 62(2):90-96. DOI:10.1080/09500340.2014.960018 · 1.17 Impact Factor
  • Marlan O Scully
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    ABSTRACT: Lasers and masers typically require population inversion. But with phase coherent atoms (phasers), we get lasing without inversion (e.g. 10% of the atoms excited). However, in recent work we found that it is possible to get coherent light emitted with no atoms excited, via Quantum Amplification of Superradiant Emission of Radiation (QASER). In particular, we found that by utilizing collective superradiant emission, we can generate coherent light at high frequency in the UV or x-ray bands by driving the atomic system with lower frequency source. Here, we present a simple analysis based on near-resonant QASER operation and on a multi-photon Hamiltonian obtained by, e.g. a canonical transformation.
    Laser Physics 08/2014; 24(9):094014. DOI:10.1088/1054-660X/24/9/094014 · 1.03 Impact Factor
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    ABSTRACT: The task of identifying explosives, hazardous chemicals, and biological materials from a safe distance is the subject we consider. Much of the prior work on stand-off spectroscopy using light has been devoted to generating a backward-propagating beam of light that can be used drive further spectroscopic processes. The discovery of random lasing and, more recently, random Raman lasing provide a mechanism for remotely generating copious amounts of chemically specific Raman scattered light. The bright nature of random Raman lasing renders directionality unnecessary, allowing for the detection and identification of chemicals from large distances in real time. In this article, the single-shot remote identification of chemicals at kilometer-scale distances is experimentally demonstrated using random Raman lasing.
    Proceedings of the National Academy of Sciences 08/2014; DOI:10.1073/pnas.1412535111 · 9.81 Impact Factor
  • Physics Today 08/2014; 67(8):10-10. DOI:10.1063/PT.3.2462 · 5.89 Impact Factor
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    ABSTRACT: We demonstrate the possibility of generation of coherent radiation with tunable frequencies higher than the frequency of the driving field νd in a nonlinear medium utilizing the difference combination resonance that occurs when νd matches the difference of the frequencies of the two generated fields ω1 and ω2. We find that such a resonance can appear in materials which have opposite signs of refractive index at ω1 and ω2. It can also occur in positive refractive index materials with strong anomalous dispersion if at one of the generated frequencies the group and phase velocities are opposite to each other. We show that the light amplification mechanism is equivalent to a combination resonance in a system of two coupled parametric oscillators with the opposite sign of masses. Such a mechanism holds promise for a new kind of light source that emits coherent radiation of tunable wavelengths by an optical parametric amplification process with the frequency higher than νd.
    07/2014; 2(1). DOI:10.1515/coph-2015-0001
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    ABSTRACT: We present an experimental study of a GaAs/Al25Ga75As terahertz quantum cascade laser in which a mid-infrared radiation serves as a coherent drive for enhancing terahertz gain.
    CLEO: QELS_Fundamental Science; 06/2014
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    ABSTRACT: The single-shot remote identification of chemicals at kilometer-scale distances is experimentally demonstrated utilizing random Raman lasing.
    CLEO: Science and Innovations; 06/2014
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    Tao Peng, Hui Chen, Yanhua Shih, Marlan O Scully
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    ABSTRACT: We report a random delayed-choice quantum eraser experiment. In a Young's double-slit interferometer, the which-slit information is learned from the photon-number fluctuation correlation of thermal light. The reappeared interference indicates that the which-slit information of a photon, or wave packet, can be "erased" by a second photon or wave packet, even after the annihilation of the first. Different from an entangled photon pair, the jointly measured two photons, or wave packets, are just two randomly distributed and randomly created photons of a thermal source that fall into the coincidence time window. The experimental observation can be explained as a nonlocal interference phenomenon in which a random photon or wave packet pair, interferes with the pair itself at distance.
    Physical Review Letters 05/2014; 112(18):180401. DOI:10.1103/PhysRevLett.112.180401 · 7.73 Impact Factor
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    ABSTRACT: Clean water is paramount to human health. In this article, we present a technique for detection of trace amounts of human or animal waste products in water using fluorescence emission cavity-enhanced spectroscopy. The detection of femtomolar concentrations of urobilin, a metabolic byproduct of heme metabolism that is excreted in both human and animal waste in water, was achieved through the use of an integrating cavity. This technique could allow for real-time assessment of water quality without the need for expensive laboratory equipment.
    Proceedings of the National Academy of Sciences 05/2014; 111(20). DOI:10.1073/pnas.1403175111 · 9.81 Impact Factor
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    ABSTRACT: Surface-enhanced coherent nonlinear optical signals can dramatically improve detection sensitivity of spectroscopic imaging techniques. Large enhancement factors (EFs) of many orders of magnitude are expected for coherent Raman scattering of molecules in local fields of plasmonic nanostructures. However, only small EFs, several orders of magnitude less than the predicted values, were experimentally observed. To understand this discrepancy we measured the spatial variation of the shape of surface-enhanced coherent anti-Stokes Raman scattering (SECARS) spectra of pyridazine on randomly aggregated gold nanoparticles. We developed a model to simulate the dependence of SECARS spectra on the position and linewidth of the surface plasmon resonance, and attribute small (and even negative) EFs to local destructive interference. We report measurements of nanoscale phase effects in SECARS, and propose strategies to increase experimental EFs towards theoretical predictions.
    Physical Review A 03/2014; 89(4). DOI:10.1103/PhysRevA.89.043841 · 2.99 Impact Factor
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    Da-Wei Wang, Ren-Bao Liu, Shi-Yao Zhu, Marlan O. Scully
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    ABSTRACT: We show that the timed Dicke states of a collection of three-level atoms can form a tight-binding lattice in the momentum space. This lattice, coined the superradiance lattice (SL), can be constructed based on an electromagnetically induced transparency (EIT) system. For a one-dimensional SL, we need the coupling field of the EIT system to be a standing wave. The detuning between the two components of the standing wave introduces an effective electric field. The quantum behaviours of electrons in lattices, such as Bloch oscillations, Wannier-Stark ladders, Bloch band collapsing and dynamic localization can be observed in the SL. The SL can be extended to two, three and even higher dimensions where no analogous real space lattices exist and new physics are waiting to be explored.
    Physical Review Letters 03/2014; 114(4). DOI:10.1103/PhysRevLett.114.043602 · 7.73 Impact Factor

Publication Stats

10k Citations
1,527.08 Total Impact Points


  • 2012–2014
    • Baylor University
      Waco, Texas, United States
  • 1995–2014
    • Texas A&M University
      • • Institute for Quantum Science and Engineering
      • • Department of Chemical Engineering
      • • Department of Physics and Astronomy
      • • Department of Mathematics
      • • Department of Electrical and Computer Engineering
      College Station, Texas, United States
  • 2013
    • Universität Ulm
      Ulm, Baden-Württemberg, Germany
  • 1970–2013
    • Princeton University
      • • Department of Chemistry
      • • Department of Mechanical and Aerospace Engineering
      Princeton, New Jersey, United States
  • 1982–2007
    • Max Planck Institute of Quantum Optics
      • Division of Laser Spectroscopy
      Arching, Bavaria, Germany
  • 2002–2004
    • Tel Aviv University
      • Department of Physics and Astronomy
      Tell Afif, Tel Aviv, Israel
  • 2001
    • University of Stirling
      Stirling, Scotland, United Kingdom
  • 1994–2000
    • Alabama A & M University
      Huntsville, Alabama, United States
  • 1998
    • Hong Kong Baptist University
      • Department of Physics
      Chiu-lung, Kowloon City, Hong Kong
  • 1994–1997
    • Houston Advanced Research Center
      The Woodlands, Texas, United States
  • 1981–1992
    • University of New Mexico
      • Department of Physics & Astronomy
      Albuquerque, New Mexico, United States
  • 1990
    • Drexel University
      • Department of Physics
      Philadelphia, Pennsylvania, United States
  • 1986–1989
    • Albuquerque Academy
      Albuquerque, New Mexico, United States
  • 1987
    • University of Nebraska at Lincoln
      • Department of Chemistry
      Lincoln, Nebraska, United States
  • 1970–1981
    • The University of Arizona
      • Department of Physics
      Tucson, Arizona, United States
  • 1980
    • Max Planck Society
      München, Bavaria, Germany
  • 1973
    • University of Colorado at Boulder
      Boulder, Colorado, United States
  • 1969–1971
    • Massachusetts Institute of Technology
      • Department of Physics
      Cambridge, Massachusetts, United States