A "molecular chip", i.e., a chip on which single macromolecules are freely arranged, is key for the fabrication of nanoscopic molecular devices, e.g., DNA array chips. We report new method manipulation already deposited macromolecules, allows to position polyelectrolytes such as substrate, bend and stretch them, remove stretching defects, overstretch double stranded into two parallel strands.

Coherent control of collective spontaneous emission in an extended atomic ensemble resonantly interacting with single-photon wave packets is analyzed. A scheme for coherent manipulation states developed such that superradiant the system can be converted into subradiant ones and vice versa. Possible applications a optical quantum state storage packet shaping are discussed. It shown also absence inhomogeneous broadening resonant line, arbitrary pulse shape may recorded as reconstructed even...

We explore spin dynamics of isotopically purified $^{166}$Er:$^{7}$LiYF$_4$ crystal below 1 Kelvin and at weak magnetic fields $<$0.3 T. Crystals grown in our lab demonstrate record-narrow inhomogeneous optical broadening down to 16~MHz. Solid state atomic ensembles with such narrow linewidths are very attractive for the implementation off-resonant Raman quantum memory interfacing superconducting circuits telecom C-band photons. Both applications require low field $\sim10$ mT. However,...

Abstract Interaction of light with media often occurs a femtosecond response time. Its measurement by conventional techniques requires the use lasers and sophisticated time-gated optical detection. Here we demonstrate that exploiting quantum interference entangled photons it is possible to measure dephasing time resonant on scale (down 100 fs) using accessible continuous wave laser single-photon counting. We insert sample in Hong-Ou-Mandel interferometer observe modification two-photon...

We study the generation of frequency nondegenerate correlated photon pairs and heralded single photons via spontaneous four-wave mixing (SFWM) in a series identical micro- or nanofibers (MNFs). Joint spectral intensity biphoton field generated at wavelengths about 880 1310 nm has been measured under excitation by 100-ps laser pulses demonstrating good agreement with theoretical prediction. The zero-time second-order autocorrelation function was 0.2 when emission rate 4 Hz. MNF-based source...

The absorption spectrum of Er 3+ ions in YAG crystal the range from 645 nm to 655 was measured with resolution 0.01 using frequency-anticorrelated broadband photon pairs (biphotons) generated by spontaneous parametric down-conversion. sample counting coincidences when impurity placed front signal detector, whilst wavelength idler photons resolved a monochromator which another detector. results are agreement those obtained usual intensity measurements classical light source and monochromator....

The effects of high optical depth phenomena, such as superradiance, are investigated in potential quantum memory materials. results may have relevance for several schemes, including controlled reversible inhomogeneous broadening, atomic frequency combs, and memories based on electromagnetically induced transparency, which using ensembles storage media. It is shown that strong superradiant manifested decay rates larger than $1/{T}_{2}^{\ensuremath{\ast}}$ present even moderate values...

The electronic properties of graphenes depend sensitively on their deformation, and therefore strain engineered graphene electronics is envisioned.(1-3) In order to deform locally, we have mechanically exfoliated single few layer onto atomically flat mica surfaces covered with isolated double stranded plasmid DNA rings. Using scanning force microscopy in both contact intermittent modes, find that the replicate topography underlying high precision. availability macromolecules different...

We propose a technique for $\ensuremath{\gamma}$ photon quantum memory through Doppler frequency comb, produced by set of resonantly absorbing nuclear targets that move with different velocities. It provides reliable storage, an on-demand generation, and time sequencing single photon. This scheme presents the first $\ensuremath{\gamma}$-photon-nuclear-ensemble interface opening new direction research in information science.

A scheme for spatial multimode quantum memory is developed such that spatial-temporal structure of a weak signal pulse can be stored and recalled via cavity-assisted off-resonant Raman interaction with strong angular-modulated control field in an extended $\ensuremath{\Lambda}$-type atomic ensemble. It shown effective storage possible when the coherence grating involves wave vectors different longitudinal components relative to paraxial field. The possibilities implementing solid-state...

Continuous change of the propagation direction a classical control field in process its off-resonant Raman interaction with weak signal three-level atomic medium is suggested for quantum storage single-photon wave packet. It shown that due to phase-matching condition such an angular allows one reversibly map packet spatial coherence grating. Thus, and retrieval can be realized without using inhomogeneous broadening transitions or manipulating amplitude field. Under some conditions proposed...

A scheme for coherent manipulation of collective atomic states is developed such that total subradiant states, in which spontaneous emission suppressed into all directions due to destructive interference between neighbor atoms, can be created an extended ensemble. The optimal conditions creation and suitability them quantum storage are discussed. It shown order achieve the maximum signal-to-noise ratio shape a light pulse stored reconstructed using homogeneously broadened absorption line...

The absorption spectrum of Cr3+ ions in Al2O3 crystal the range from 691 nm to 697 was measured at room temperature using biphoton light generated by nondegenerate spontaneous parametric down-conversion He-Cd laser radiation (325 nm) LiIO3 crystal. sample counting coincidences when signal photons go through impurity crystal, whilst wavelength idler is resolved a monochromator. A strongly regime SPDC, difference frequencies correlated exceeds significantly their spectral width, used...

Off-resonant Raman interaction of a single-photon wave packet and classical control field in an atomic medium with controlled refractive index is investigated. It shown that continuous change during the leads to mapping single photon state superposition collective excitations (spin waves) different vectors vice versa. The suitability refractive-index for developing multichannel quantum memories discussed possible schemes implementation are considered.

We suggest an all-optical quantum memory scheme which is based on the off-resonant Raman interaction of a signal field and strong control in three-level atomic medium case, when has spatially varying frequency across beam, called spatial chirp. show that effect such chirp analogous to controllable reversible inhomogeneous broadening (CRIB) transition used gradient echo (GEM) scheme. However, proposed does not require temporal modulation or levels, can be realized without additional electric...

The theory of third-order spontaneous parametric down-conversion (TOSPDC) in a ring waveguide microcavity is developed. Analytical expressions for the rate photon triplet emission are presented both monochromatic-pump and pulsed-pump regimes. In latter case, rising exponential pulses considered as optimal ones cavity excitation. It demonstrated by numerical simulations that silicon-nitride based can be promising system developing narrowband sources triplets on TOSPDC.

Cavity-assisted storage and retrieval of single-photon wave packets in optically thin spatially extended resonant materials are analyzed. It is shown that the use cavity tuning allows one to store recall time-symmetric double-sided exponential pulses with near unit efficiency. The optimal regime determined effect time jitter on efficiency

In this work we present an implementation of cavity-assisted atomic frequency comb (AFC) memory protocol in isotopically pure 143Nd3+ :YLiF4 crystal. We use a tunable confocal Fabry–Perot cavity that is placed inside the cryostat. For 1 mm thick sample with optical depth 0.2 obtain total storage efficiency 3%, which 15-fold enhancement compared to no case. The bandwidth limited by inhomogeneous broadening transition and allows us store short 30 ns pulses.

Two-pulse, stimulated and accumulated photon echoes are investigated for the first time in a highly doped crystal Tm:YAG containing 10 at.% Tm3+. The decay curves of two-pulse generated at 793.15 nm on transition 3H6(1)–3H4(1) impurity ions measured absence an applied magnetic field parameters describing energy phase relaxation determined. dependence intensity echo number excitation pulse pairs is investigated.

We implemented the atomic frequency comb protocol for optical quantum memory in an isotopically pure crystal of Y7LiF4 doped by 143Nd3+ ions. Echo signals were observed on 4I9/2(1)–4F3/2(1) transition, which had inhomogeneous broadening much smaller than hyperfine splitting ground and excited states. performed hole-burning spectroscopy measurements several transitions, obtaining information about state lifetimes. An intrinsic hole structure was found some allowed us to prepare a with two...

We present optical vector network analysis (OVNA) of an isotopically purified 166 Er 3+ : 7 LiYF4 crystal.The OVNA method is based on generation and detection modulated sideband by using a radio-frequency analyzer.This technique widely used in the field microwave photonics for characterization responses devices such as filters high-Q resonators.However, dense solid-state atomic ensembles induce large phase shift one sidebands which results appearance extra features measured transmission...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTControl over Nanopits on the Basal Plane of Graphite by Remote Argon Plasma and Subsequent Thermal OxidationA. Tracz, A. Kalachev, G. Wegner, J. P. RabeCite this: Langmuir 1995, 11, 7, 2840–2842Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue 1 July 1995https://pubs.acs.org/doi/10.1021/la00007a080https://doi.org/10.1021/la00007a080research-articleACS PublicationsRequest reuse permissionsArticle...