Annular pupils, radial polarization, and superresolution

Sheppard, Colin J. R.; Choudhury, Arup

doi:10.1364/ao.43.004322

Cited by 325 publications

(154 citation statements)

References 54 publications

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“…7.2 and Sec. 7.4 are devoted, respectively, to discuss theoretically and demonstrate experimentally optical trapping of 87 Rb BECs in a blue-detuned 3D trap and in a bluedetuned light ring provided by CR. stadt (TUD); and has been published in Refs.…”

Section: Discussionmentioning

confidence: 99%

“…Their applications range from particle trapping [86], subdiffraction limited tighter focusing [87] and plasmon excitation [88] to laser machining [89]. Laguerre-Gauss beams are well known examples of light beams possessing optical vortices forming a straight nodal line surrounded by light [90].…”

Section: Generating a 3d Dark Focus With Conical Refractionmentioning

confidence: 99%

“…7.2. A 90 • mutually intersected pair of beams (not shown in the set-up) forming a crossed optical dipole trap is used to create a BEC of 25000 87 Rb atoms in the center of the vacuum chamber. The crossing plane of the two beams is in the direction perpendicular to gravity.…”

Section: Axial Directionmentioning

confidence: 99%

“…Starting from the fundamental CR equations, we will obtain the trapping potentials and potential depths under the harmonic approximation. Then we will demonstrate experimental trapping of 87 Rb BECs in these potentials.…”

Section: Introductionmentioning

confidence: 98%

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Conical refraction: fundamentals and applications

Turpin

Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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A mis padres, hermanos, sobrinos y a Raquel AcknowledgmentsTot té un principi i un final i aquest serà el punt final a una etapa de la meva vida la qual estic segur que d'aquí uns anys, quan miri enrere, veuré que ha estat probablement la que ha tingut una major rellevància tant a nivell personal com científic. Quan vaig acabar la carrera no tenia gaire clar quin camí seguir però vaig tenir la sort de parlar amb qui ha estat el meu director de tesi, el Jordi, qui em va guiar i va posar tota la seva confiança en mi des del primer moment. Em va oferir un tema original i es va aventurar a dirigir una tesi amb una forta vessant experimental, tot un atreviment venint d'un teòric! Quan vaig començar el Màster, si m'haguessin dit on he arribat 5 anys després mai m'ho hauria cregut i, Jordi, tu tens gran part de culpa de tot això. Moltes gràcies per haver confiat en mi des del primer dia, per haver-te mostrat sempre tan orgullós de tot el que he fet, per haver estat sempre disponible i per ajudar-me i animar-me quan he passat moments durs durant aquest anys. M'has ensenyat a ser un bon científic, a moure'm dins aquest món, a creure em mi i a ser una millor persona. Mai t'estaré prou agraït per tot això i per haver sigut tan proper amb els teus cotilleos, converses de futbol, política, noies, etc. dinant al bar. Has estat com un pare per a mi (bueno, un germà gran, que tampoc ets tan vell per a ser Mompare :P). Si el Jordi ha estat el meu pare en la ciència, el Yury ha estat el meu gurú científic. Mai he trobat una persona tan pacient, que sàpiga tant de qualsevol tema i amb tanta dedicació com tu. M'has ensenyat a ser riguròs, a tenir un mètode, la importància de estar al dia de tot el que es fa en el cap d'estudi, a programar, i un llarg etcètera. En resum, m'has ajudat a donar-me forma a mi mateix com a científic i a tenir perseverança en el que faig. Tot això sense oblidar que per a mi ets un gran amic! Seguidament, també he donar les gràcies al Todor, una de les persones més enèrgiques que conec i amb més passió per la ciència. Tu vas iniciar tot el tema de la refracció cònica al nostre grup i has demostrat que ets realment qui més coneix de cristalls i del fenomen en si. Si no hagués estat per tu, no podríem haver començat res d'això i no podríem haver explotat el fenomen ni una quarta part del que hem fet. Ets un exemple per tenir sempre un somriure a la cara i per aquesta iii iv força que et fa tirar endavant tots els teus projectes. També vull donar les gràcies a altres companys del Grup d'Òptica, començant per la Verònica, que va passar de ser una "professora de la carrera" a ser el meu ideal de constància i l'esforç. Ets un exemple professional a més a més d'una persona molt més propera i alegra del que pot semblar a primera vista. A Ramón también le tengo que agradecer su ayuda y su disponibilidad a lo largo de estos años, su paciencia cuando ha tenido que soportar mis imitaciones y su alegría y naturalidad en todo momento. Amb el Francesc també he compartit molts bons moments, sobretot a les diverses activit...

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Section: Discussionmentioning

confidence: 99%

Section: Generating a 3d Dark Focus With Conical Refractionmentioning

confidence: 99%

Section: Axial Directionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Conical refraction: fundamentals and applications

Turpin

Loiko

Kalkandjiev

et al. 2016

Laser & Photonics Reviews

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“…[4] Various complex light field beams have been investigated, such as the radially polarized Lorentz-Gauss vortex beam [5] and the radially polarized Laguerre-Bessel-Gaussian beam. [6] Radially polarized beams have become an active research topic over the years because of their specific focusing characteristics [7,8] and potential applications in super resolution [9,10] and particle manipulation, [6] www.advopticalmat. de found.…”

Section: Introductionmentioning

confidence: 99%

Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

Guo

Wang

et al. 2017

Advanced Optical Materials

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as well as ultrafast phenomena sensing. [11] Practical applications for nondiffracted waves include light collimating, focusing, and shaping. [12][13][14] The Lorentz beam is a nondiffracted wave that is characterized by small size, long focal length, and extended transmission distance. [12] Typical techniques to produce Lorentz beams usually involve combinations of multiple optical elements. However, such systems are bulky, complicated, and inconvenient. To generate such novel beams simply, we employ a single layer metasurface device to modulate simultaneously the amplitude and polarization of the illuminating light. Metasurfaces are viewed as a kind of artificial material composed of periodic subwavelength metal or dielectric structures. When coupled resonantly to the electric and/or magnetic components of an incident electromagnetic field, they provide a spatially varying optical response (e.g., scattering amplitude, phase, and polarization). With the advantage of easy-etching, ultrathin as well as miniaturization, a broad range of applications of metasurfaces has been reported, including superlenses, [15,16] wave plates, [17][18][19] nonlinear optics, [20] and holograms. [21] However, these previous studies were focused on modulating one attribute of light beams, for example amplitude, phase or polarization. Several studies were reported to have modulated the phase [22] and polarization direction. [23] Only numerical simulations are carried out to demonstrate the ability of metasurface for multiple parameters modulation because double-layer structures [24] are difficult to fabricate. Traditionally, the concentric metal-ring wire grid is used to achieve radial polarization. [25][26][27] The structure is relatively simple but fails to generate amplitude modulation. Furthermore, circularly polarized light is required to generate radially polarized light; nevertheless, it comes accompanied by an unexpected vortex phase distribution. In this work, a designed metasurface is fabricated consisting of crosses of various sizes and orientations. The variation in size is employed to modulate the amplitude whereas variation in orientation is used to modulate the polarization distribution. With right/left circularly polarized (RCP/LCP) incidence, the output polarization may be radial or angular, whereas the amplitude obeys the Lorentz distribution. Nine cross structures were fabricated to achieve certain desired amplitude and polarization modulations. The polarization and amplitude distributions of the beam generated by the device are detected using a terahertz focal plane imaging system. A strong agreement between theoretical and experimental results was

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Localized Beams and Localized Pulses: Generation Using the Angular Spectrum

Sheppard

2013

Non‐Diffracting Waves

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Annular pupils, radial polarization, and superresolution

Cited by 325 publications

References 54 publications

Conical refraction: fundamentals and applications

Conical refraction: fundamentals and applications

Generation of Radial Polarized Lorentz Beam with Single Layer Metasurface

Localized Beams and Localized Pulses: Generation Using the Angular Spectrum

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