SwePub
Sök i SwePub databas

  form:Ext_t

Träfflista för sökning "L773:1094 4087 ;lar1:(kth)"

form:Search_simp_t: L773:1094 4087 > swepub_uni:Kth_t

  • navigation:Result_t 1-10 navigation:of_t 377
hitlist:Modify_result_t
   
hitlist:Enumeration_thitlist:Reference_thitlist:Reference_picture_thitlist:Find_Mark_t
1.
  • Ako, Thomas, et al. (creator_code:aut_t)
  • Design of invisibility cloaks with an open tunnel
  • 2010
  • record:In_t: Optics Express. - 1094-4087. ; 18:26, s. 27060-27066
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • In this paper we apply the methodology of transformation optics for design of a novel invisibility cloak which can possess an open tunnel. Such a cloak facilitates the insertion (retrieval) of matter into (from) the cloak's interior without significantly affecting the cloak's performance, overcoming the matter exchange bottleneck inherent to most previously proposed cloak designs. We achieve this by applying a transformation which expands a point at the origin in electromagnetic space to a finite area in physical space in a highly anisotropic manner. The invisibility performance of the proposed cloak is verified by using full-wave finite-element simulations. (C) 2010 Optical Society of America
  •  
2.
  • Akram, Muhammad Nadeem, et al. (creator_code:aut_t)
  • Influence of base-region thickness on the performance of Pnp transistor-VCSEL
  • 2014
  • record:In_t: Optics Express. - 1094-4087. ; 22:22, s. 27398-27414
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We have recently reported a 980nm GaAs-based three terminal Pnp transistor-vertical-cavity surface-emitting laser (TVCSEL) operating at room temperature with optical power up to 1.8mW. However, the current gain beta = Delta I-c/Delta I-b was near zero just before lasing and became negative after the lasing threshold. The main cause of the negative current gain was found to be a gradual and position-dependent forward-biasing (saturation) of the base-collector junction with increasing bias even before lasing threshold. In this article, detailed multi-physics device simulations are performed to better understand the device physics, and find ways to avoid the premature saturation of the base-collector junction. We have optimized the thickness of the base region as well as its doping concentration and the location of the quantum wells to ensure that the T-VCSEL is in the active mode throughout its range of operation. That is, the emitter-base junction is forward biased and base-collector junction is reversed biased for sweeping the excess charges out of the base region.
  •  
3.
  • Alcusa-Sáez, E. P., et al. (creator_code:aut_t)
  • Acousto-optic interaction in polyimide coated optical fibers with flexural waves
  • 2017
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:15, s. 17167-17173
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Acousto-optic coupling in polyimide-coated single-mode optical fibers using flexural elastic waves is demonstrated. The effect of the polyimide coating on the acousto-optic interaction process is analyzed in detailed. Theoretical and experimental results are in good agreement. Although the elastic attenuation is significant, we show that acousto-optic coupling can be produced with a reasonably good efficiency. To our knowledge, it is the first experimental demonstration of acousto-optic coupling in optical fibers with robust protective coating.
  •  
4.
  • Antelius, Mikael, et al. (creator_code:aut_t)
  • An apodized SOI waveguide-to-fiber surface grating coupler for single lithography silicon photonics
  • 2011
  • record:In_t: Optics Express. - 1094-4087. ; 19:4, s. 3592-3598
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We present the design, fabrication, and characterization of a grating for coupling between a single mode silica fiber and the TE mode in a silicon photonic waveguide on a silicon on insulator (SOI) substrate. The grating is etched completely through the silicon device layer, thus permitting the fabrication of through-etched surface coupled silicon nanophotonic circuits in a single lithography step. Furthermore, the grating is apodized to match the diffracted wave to the mode profile of the fiber. We experimentally demonstrate a coupling efficiency of 35% with a 1 dB bandwidth of 47 nm at 1536 nm on a standard SOI substrate. Furthermore, we show by simulation that with an optimized buried oxide thickness, a coupling efficiency of 72% and a 1 dB bandwidth of 38 nm at 1550 nm is achievable. This is, to our knowledge, the highest simulated coupling efficiency for single-etch TE-mode grating couplers. In particular, simulations show that apodizing a conventional periodic through-etched grating decreases the back-reflection into the waveguide from 21% to 0.1%.
  •  
5.
  • Ao, Xianyu, et al. (creator_code:aut_t)
  • Two-stage design method for realization of photonic bandgap structures with desired symmetries by interference lithography
  • 2004
  • record:In_t: Optics Express. - 1094-4087. ; 12:6, s. 978-983
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • Interference lithography for the fabrication of photonic crystals is considered. A two-stage design method for realization of photonic bandgap structures with desired symmetries is developed. An optimal photonic crystal with a large bandgap is searched by adjusting some parameters while keeping some basic symmetry of the unit cell unchanged. A nonlinear programming method is then used to find the optimal electric field vectors of the laser beams and realize the desired interference pattern. The present method is useful for a rational and systematical design of new photonic bandgap structures.
  •  
6.
  • Arias, Augusto, et al. (creator_code:aut_t)
  • Simultaneous rotation, orientation and displacement control of birefringent microparticles in holographic optical tweezers
  • 2013
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 21:1, s. 102-111
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We report the experimental implementation of a new method for generating multiple dynamical optical tweezers, where each one of them is generated with an independent linear polarization state with arbitrary orientation. This also allows an independent simultaneous polarization-rotation control. The laser beam, both for generating multiple traps and polarization control, has been modulated using a single reflective nematic liquid crystal with parallel alignment. We present experimental results of controlled displacement, orientation and rotation of birefringent particles. In addition, a simple method for estimating and canceling out the primary astigmatism present in the system is presented.
  •  
7.
  • Baek, In Hyung, et al. (creator_code:aut_t)
  • Single-walled carbon nanotube saturable absorber assisted high-power mode-locking of a Ti:sapphire laser
  • 2011
  • record:In_t: Optics Express. - 1094-4087. ; 19:8, s. 7833-7838
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We report on passive mode-locking of a Ti:sapphire laser employing a single-walled carbon nanotube saturable absorber (SWCNT-SA) specially designed and fabricated for wavelengths near 800 nm. Mode-locked pulses as short as 62 fs were generated at a repetition rate of 99.4 MHz. We achieved output powers from the SWCNT-SA mode-locked laser as high as 600 mW with a slope efficiency of 26%. The characteristics of SWCNT-SA-assisted mode-locking were compared with those of Kerr-lens mode-locking without SWCNT-SA.
  •  
8.
  • Baghban, Mohammad Amin, et al. (creator_code:aut_t)
  • Bragg gratings in thin-film LiNbO3 waveguides
  • 2017
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 25:26, s. 32323-32332
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We design, fabricate and characterize sidewall corrugated Bragg gratings in a high confinement integrated optics lithium niobate platform, comprising submicrometric photonic wires, tapers and grating couplers to interface off-chip standard telecom optical fibers. We analyze the grating performance as band-rejection filter for TE-polarized signals in the telecom C-band, considering both rectangular and sinusoidal sidewall profiles, and demonstrate record extinction ratios as high as 27 dB and rejection bandwidths as narrow as 3 nm. The results show the potential for an efficient integration of novel photonic functionalities into low-footprint LiNbO3 nonlinear and electro-optical waveguide devices.
  •  
9.
  • Bagschik, K., et al. (creator_code:aut_t)
  • Spatial coherence determination from the Fourier analysis of a resonant soft X-ray magnetic speckle pattern
  • 2016
  • record:In_t: Optics Express. - : Optical Society of America. - 1094-4087. ; 24:20, s. 23162-23176
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We present a method to determine the two-dimensional spatial coherence of synchrotron radiation in the soft X-ray regime by analyzing the Fourier transform of the magnetic speckle pattern from a ferromagnetic film in a multidomain state. To corroborate the results, a Young's double-pinhole experiment has been performed. The transverse coherence lengths in vertical and horizontal direction of both approaches are in a good agreement. The method presented here is simple and gives a direct access to the coherence properties of synchrotron radiation without nanostructured test objects.
  •  
10.
  • Barrios, Carlos Angulo, et al. (creator_code:aut_t)
  • Demonstration of slot-waveguide structures on silicon nitride / silicon oxide platform
  • 2007
  • record:In_t: Optics Express. - 1094-4087. ; 15:11, s. 6846-6856
  • swepub:Mat_article_t (swepub:level_refereed_t)abstract
    • We report on the first demonstration of guiding light in vertical slot-waveguides on silicon nitride/silicon oxide material system. Integrated ring resonators and Fabry-Perot cavities have been fabricated and characterized in order to determine optical features of the slot-waveguides. Group index behavior evidences guiding and confinement in the low-index slot region at O-band (1260-1370nm) telecommunication wavelengths. Propagation losses of < 20 dB/cm have been measured for the transverse-electric mode of the slot-waveguides.
  •  
Skapa referenser, mejla, bekava och länka
  • navigation:Result_t 1-10 navigation:of_t 377
swepub:Mat_t
swepub:mat_article_t (375)
swepub:mat_conferencepaper_t (2)
swepub:Level_t
swepub:level_refereed_t (373)
swepub:level_scientificother_t (4)
swepub:Hitlist_author_t
He, Sailing (75)
Laurell, Fredrik (58)
Pasiskevicius, Valda ... (45)
Qiu, Min (38)
Margulis, Walter (23)
Popov, Sergei (20)
deldatabas:search_more_t
Canalias, Carlota (20)
Yan, Min (19)
Friberg, Ari T. (12)
Thylén, Lars (11)
Zukauskas, Andrius (10)
Gallo, Katia (10)
Ozolins, Oskars (9)
Wosinski, Lech (9)
Tarasenko, Oleksandr (9)
Chen, Jiajia (8)
Vogt, Ulrich (8)
Jacobsen, Gunnar (8)
Pang, Xiaodan, Dr. (8)
Li, Qiang (8)
Laurell, Fredrik, pr ... (8)
Zwiller, Val (8)
Jacobsson, Björn (7)
Pollnau, Markus (7)
Deng, Lei (6)
Hertz, Hans M. (6)
Ferraro, P (6)
Pang, Xiaodan, 1986- (5)
Pereira, Joao (5)
Zhang, Ziyang (5)
Lindberg, Robert (5)
Liu, Deming (5)
Burvall, Anna (5)
Grilli, Simonetta (5)
De Natale, P. (5)
Li, Q. (4)
Jin, Y. (4)
Jin, Yi (4)
Schatz, Richard, 196 ... (4)
Anand, Srinivasan (4)
Swillo, Marcin (4)
Yu, Xianbin (4)
Wang, Jing (4)
Zichi, Julien (4)
Li, Jie (4)
Friberg, Ari (4)
Cai, Yangjian (4)
Fragemann, Anna (4)
Lin, Rui (4)
Evans, Julian (4)
deldatabas:search_less_t
swepub:Hitlist_uni_t
swepub_uni:ri_t (29)
swepub_uni:lu_t (6)
swepub_uni:cth_t (5)
swepub_uni:uu_t (3)
swepub_uni:kau_t (2)
deldatabas:search_more_t
swepub_uni:su_t (1)
swepub_uni:oru_t (1)
deldatabas:search_less_t
hitlist:Language_t
language:Eng_t (377)
hitlist:HSV_t
hsv:Cat_1_t (243)
hsv:Cat_2_t (82)
hsv:Cat_3_t (1)

hitlist:Year_t

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt tools:Close_t

tools:Permalink_label_t