scholarly journals Tunable sinusoidal Phase Gratings and sinusoidal Phase Zone Plates

2017 ◽  
Vol 9 (2) ◽  
pp. 57
Author(s):  
Jorge Ojeda-Castaneda ◽  
Cristina M. Gómez-Sarabia ◽  
Miguel Torres-Cisneros ◽  
Luis M. Ledesma-Carrillo ◽  
Rafael Guzmán-Cabrera ◽  
...  
Keyword(s):  
High Speed ◽  
Patent Application ◽  
Optical Systems ◽  
Free Form ◽  
Depth Of Field ◽  
Phase Plate ◽  
Phase Zone ◽  
British Patent ◽  
Spherical Lens ◽  
Zone Plates

We disclose the use of a suitable pair of phase-only masks for generating sinusoidal phase gratings, or sinusoidal phase zone plates, with tunable optical path delays. We show that these gratings can have either 1-D structure or a 2-D radial structure. Full Text: PDF ReferencesB. Berge and J. Peseux, "Variable focal lens controlled by an external voltage: An application of electrowetting", Eur. Phys. J. E 3, 159-163 (2000). CrossRef H. W. Ren, Y. H. Fan, S. Gauza, and S. T. Wu, "Tunable-focus flat liquid crystal spherical lens", Appl. Phys. Lett. 84, 4789-4791 (2004). CrossRef T. Martinez, D. V. Wick, D. M. Payne, J. T. Baker, and S. R. Restaino, "Non-mechanical zoom system", Proc. SPIE 5234, 375-378 (2004). CrossRef D. Y. Zhang, N. Justis, and Y. H. Lo, "Fluidic adaptive zoom lens with high zoom ratio and widely tunable field of view", Opt. Commun. 249, 175-182 (2005). CrossRef B. H. W. Hendriks, S. Kuiper, M. A. J. Van As, C. A. Renders and T. W. Tukker, "Electrowetting-Based Variable-Focus Lens for Miniature Systems", Opt. Rev. 12, 255-259 (2005). CrossRef M. Duocastella and C. B. Arnold, "Enhanced depth of field laser processing using an ultra-high-speed axial scanner", Appl. Phys. Lett. 102, 06113-1--06113-3 (2013). CrossRef Jorge Ojeda-Casta-eda, José Enrique A. Landgrave and Cristina M. Gómez-Sarabia, "Conjugate phase plate use in analysis of the frequency response of imaging systems designed for extended depth of field", Appl. Opt. 47, E99 (2008). CrossRef A.W. Lohmann, British Patent 998, 191 (May 29, 1964).A.W. Lohmann, Republic Française 1, 398, 351 (June 10, 1964).A.W. Lohmann, Italy Patent 727, 848 (June 19, 1964).A.W Lohmann, "A New Class of Varifocal Lenses", Appl. Opt. 9, 1669 (1970). CrossRef L.W. Alvarez, U.S. patent 3,305,294 (21 February 1967).L.W. Alvarez , W. E. Humphrey, U.S. patent 3,507,565 (21 April, 1970).L.W. Alvarez, J. Am. Optometric Assoc. 49, 24 (1978).S. Bernet and M. Ritsch-Marte, U.S. patent application 20100134869 A1 (June 3, 2010).Jorge Ojeda-Castaneda, S. Ledesma, and C. M. Gómez-Sarabia, "Tunable apodizers and tunable focalizers using helical pairs", Phot. Lett. Poland 5, 20 (2013). CrossRef J. Ojeda-Casta-eda, C. M. Gómez-Sarabia, and S. Ledesma, "Novel free-form optical pairs for tunable focalizers", J. Opt. 43, 85 (2014). CrossRef J. Ojeda-Castaneda, A. L. Barragán-Chávez, and C. M. Gómez-Sarabia, "Aberration generators in tandem", Phot. Lett. Poland 7, 8 (2015). CrossRef Adolf W. Lohmann and Donald A. Silva, "An interferometer based on the Talbot effect", Optics Comm. 2, 413 (1971). CrossRef S. Yokozeki and T. Suzuki, "Shearing Interferometer Using the Grating as the Beam Splitter", Appl. Opt. 10, 1575 (1971). CrossRef Jason Geng, "Structured-light 3D surface imaging: a tutorial", Adv. Opt. Phot. 3, 128 (2011). CrossRef Jorge Ibarra and J. Ojeda-Casta-eda, "Talbot interferometry: a new geometry", Opt. Commun. 96, 294 (1993). CrossRef J. Ojeda-Castaneda, C.M. Gómez-Sarabia, S. Ledesma, "Novel zoom systems using a vortex pair", Asian J. Phys. 23, 415 (2014). DirectLink J. Ojeda-Castaneda, C.M. Gómez-Sarabia, S. Ledesma, Asian J. Phys. 23, 535 (2014). DirectLink J. Ojeda-Casta-eda and Cristina M. Gómez-Sarabia, "Nonconventional optical systems using varifocal lenses", Phot. Lett. Poland 7, 14 (2015). CrossRef

High speed optical switching gain based EDFA model with 30 Gb/s NRZ modulation code in optical systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahmoud M. A. Eid ◽  
Ahmed Nabih Zaki Rashed ◽  
Keyword(s):  
Optical Fiber ◽  
High Speed ◽  
Optical Switching ◽  
Fiber Amplifier ◽  
Optical Systems ◽  
Power Budget ◽  
Erbium Doped Fiber Amplifier ◽  
Amplifier Model ◽  
Modulation Rate ◽  
Modulation Code

AbstractThis study presents high speed optical switching gain based Erbium doped fiber amplifier model. By using the proposed model the optical fiber loss can be minimized. The system is stabilized with the power budget of 25.875 mW a long 75 km as a length of optical fiber in this study can be verified. The modulation rate of 10 Gb/s can be upgrade up to reach 30 Gb/s. The suitable power for the optical transmitter is −2.440 dBm and NRZ modulation code is verified. The receiver sensitivity can be upgraded with the minimum bit error rate and max Q factor are 1.806 e−009 and 5.899.

scholarly journals A micromirror array with annular partitioning for high-speed random-access axial focusing

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Nathan Tessema Ersumo ◽  
Cem Yalcin ◽  
Nick Antipa ◽  
Nicolas Pégard ◽  
Laura Waller ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Visual Information ◽  
High Speed ◽  
Random Access ◽  
General Purpose ◽  
Phase Shifting ◽  
Optical Systems ◽  
Piston Motion ◽  
Refresh Rate ◽  
Circular Symmetry

Abstract Dynamic axial focusing functionality has recently experienced widespread incorporation in microscopy, augmented/virtual reality (AR/VR), adaptive optics and material processing. However, the limitations of existing varifocal tools continue to beset the performance capabilities and operating overhead of the optical systems that mobilize such functionality. The varifocal tools that are the least burdensome to operate (e.g. liquid crystal, elastomeric or optofluidic lenses) suffer from low (≈100 Hz) refresh rates. Conversely, the fastest devices sacrifice either critical capabilities such as their dwelling capacity (e.g. acoustic gradient lenses or monolithic micromechanical mirrors) or low operating overhead (e.g. deformable mirrors). Here, we present a general-purpose random-access axial focusing device that bridges these previously conflicting features of high speed, dwelling capacity and lightweight drive by employing low-rigidity micromirrors that exploit the robustness of defocusing phase profiles. Geometrically, the device consists of an 8.2 mm diameter array of piston-motion and 48-μm-pitch micromirror pixels that provide 2π phase shifting for wavelengths shorter than 1100 nm with 10–90% settling in 64.8 μs (i.e., 15.44 kHz refresh rate). The pixels are electrically partitioned into 32 rings for a driving scheme that enables phase-wrapped operation with circular symmetry and requires <30 V per channel. Optical experiments demonstrated the array’s wide focusing range with a measured ability to target 29 distinct resolvable depth planes. Overall, the features of the proposed array offer the potential for compact, straightforward methods of tackling bottlenecked applications, including high-throughput single-cell targeting in neurobiology and the delivery of dense 3D visual information in AR/VR.

scholarly journals High-Speed Epitaxy Using Supersonic Molecular Jets

1990 ◽  
Vol 201 ◽  
Author(s):  
Djula Eres
Keyword(s):  
Thin Film ◽  
Growth Rates ◽  
High Speed ◽  
Film Growth ◽  
Thin Film Growth ◽  
Free Form ◽  
Electrical Measurements ◽  
Growth Technique ◽  
Pulsed Jets ◽  
Gaseous Source

AbstractThis paper discusses the use of supersonic jets of gaseous source molecules in thin film growth. Molecular jets in free form with no skimmers or collimators in the nozzle-substrate path were used in the investigation of basic film growth processes and in practical film growth applications. The Ge growth rates were found to depend linearly on the digermane jet intensity. Furthermore, the film thickness distributions showed excellent agreement with the distribution of digermane molecules in the jet. High epitaxial Ge growth rates were achieved on GaAs (100) substrates by utilizing high-intensity pulsed jets. The practical advantages and limitations of this film growth technique are evaluated, based on the results of microstructural and electrical measurements of heteroepitaxial Ge films on GaAs (100) substrates.

Diamond-Like Carbon Coating—It'S Application for Polymeric Substrates

1991 ◽  
Vol 239 ◽  
Author(s):  
Fred M. Kimock ◽  
Alex J. Hsieh ◽  
Peter G. Dehmer ◽  
Pearl W. Yip
Keyword(s):  
High Speed ◽  
Protective Coatings ◽  
Ion Beam ◽  
Chemical Exposure ◽  
Optical Systems ◽  
Impact Behavior ◽  
Organic Liquids ◽  
Diamond Like Carbon ◽  
Dlc Coating ◽  
The Impact

ABSTRACTWe report on a recently commercialized Diamond-Like Carbon (DLC) coating that has been deposited on polycarbonate at near room temperature, via a unique ion beam system. Aspects of high speed impact behavior, chemical resistance, abrasion resistance, and thermal stability of the coating are examined. Results of scanning electron microscopy studies indicate that adhesion of the DLC coating is very good; no delamination of the coating was found on ballistically tested specimens. The well-bonded DLC coating did not cause the impact performance of polycarbonate to become brittle. Chemical exposure test results show that the DLC coating is capable of protecting polycarbonate from chemical attack by aggressive organic liquids. These ion beam deposited DLC coatings have considerable potential as protective coatings for optical systems.

Practicality Assessment of a Frugal Nanoparticle Generator: Opening doors to Nano Pharmaceuticals for the researchers and students of underprivileged academic institutions.

2021 ◽  
Vol 17 ◽  
Author(s):  
Swayamprakash Patel ◽  
Ashish Patel ◽  
Mruduka Patel ◽  
Umang Shah ◽  
Mehul Patel ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Organic Solvent ◽  
Ultrasonic Vibration ◽  
High Speed ◽  
Patent Application ◽  
Entrapment Efficiency ◽  
Proof Of Concept ◽  
Research Institutions ◽  
Novel Approach ◽  
Sophisticated Equipment

Background: Probe sonication and High-speed homogenizer are comparatively costly equipment to fabricate the nanoparticles. Many academic and research institutions cannot afford the procurement and maintenance of such sophisticated equipment. In the present work, a newer idea is conceptualized, which can be adopted by the underprivileged research institutions to fabricate solid lipid nanoparticles (SLN) in the absence of sophisticated equipment. The current work describes the pilot-level trials of this novel approach. This study represents the preliminary proof-of-concept trials for which the Indian patent application (3508/MUM/2015) is filed. Method: A frugal piece of equipment was made using a 50 ml centrifuge tube with conical bottom and a piezoelectric mist maker or humidifier. SLNs were prepared by combining the quasi-emulsion solvent evaporation approach and ultrasonic vibration approach. A quasi-emulsion was composed by the dropwise mixing of the organic solvent containing drug & lipid with an aqueous solution containing surfactant under continuous ultrasonic vibration in the piezoelectric chamber. The size of the droplets was significantly reduced due to piezoelectric ultrasonic vibration. Under the provision of mild vacuum and heat generated by vibration, the organic solvent was evaporated, which leaves behind a suspension of SLN. In the present work, albendazole was selected as a model drug. Various trials with Compritol 888 ATO® and Precirol ATO 5® as a lipid carrier and Tween 80 and Poloxamer 188 as a surfactant were performed. Zeta potential of SLNs was improved by the addition of polyelectrolytes like K2SO4 and Na4P2O7. Result and Conclusion: The ratio of drug to lipid was optimized to 1:4 for the most favorable results. SLN with a minimum Z-average diameter of 98.59 nm, -21 mV zeta potential, and 34.064 % (SD 10.78, n=9) entrapment efficiency were developed using the Precirol ATO 5 ® as a lipid carrier. The proof of concept for this novel approach is established through the development of Albendazole SLNs. This approach must also be evaluated for the development of polymeric nanoparticles and vesicular formulations. The further sophistication of the frugal equipment may allow more control over the quality of SLN. This approach will enable underprivileged researchers to prepare Nanopharmaceuticals. Researchers and students of such institutions can focus on the application of SLN by resolving the constraint of sophisticated equipment with this novel approach. This novel approach should also be tried for polymeric and vesicular nanopharmaceuticals.

Laser Monitors for High Speed Imaging of Plasma, Beam and Discharge Processes

2016 ◽  
Vol 712 ◽  
pp. 303-307 ◽  
Author(s):  
Maxim V. Trigub ◽  
Stanislav N. Torgaev ◽  
Gennadiy S. Evtushenko ◽  
Vitaliy V. Drobchik
Keyword(s):  
High Speed ◽  
Metal Vapor ◽  
Optical Systems ◽  
Imaging Method ◽  
High Speed Imaging ◽  
Destructive Testing ◽  
Copper Bromide ◽  
Imaging Results ◽  
High Pulse ◽  
Non Destructive

The imaging results of different processes blocked from the observation by the intense background light are presented in this paper. Active optical systems based on high-frequency brightness amplifier are used to decrease the negative factor of the glare. The experimental and modeling results on obtaining high pulse repetition frequencies (PRF) (more than 100 kHz) of copper bromide vapor brightness amplifiers operating in a low input energy mode are shown. The use of metal vapor brightness amplifiers for visual non-destructive testing of fast processes obscured by the glare is also discussed. It has been shown that the imaging method proposed in this paper proves to be the most reliable to obtain the information about objects or processes in a real time mode using high PRF CuBr active media.

Herbert Wakefield Banks Skinner, 1900-1960

1960 ◽  
Vol 6 ◽  
pp. 259-268
Keyword(s):  
Trinity College ◽  
Combustion Engine ◽  
Patent Application ◽  
Research Work ◽  
Nuclear Research ◽  
Natural Sciences ◽  
British Patent ◽  
Cavendish Laboratory ◽  
European Organization ◽  
Head Of School

Herbert Wakefield Banks Skinner was born on 7 October 1900, at Ealing on the western outskirts of London and died at Geneva while on a visit to the European Organization for Nuclear Research on 20 January 1960. He was the only son of George Herbert and Mabel Elizabeth Skinner. His father was a member of the directorate of the shoe firm, Lilley and Skinner, and was in many ways a remarkable man. The interests of George Skinner lay more with motoring and engineering than with commerce and he appears to have been one of the first in England to own a motor-car. He brought over from France a Léon Bollée car; a type which originated as long ago as 1896. His interests in the mechanism of the internal combustion engine led to the invention of a new type of carburettor which was the subject of a British patent application in February 1905 and which was built in the first instance in his own house. Later the demand for an efficient carburettor led to collaboration with his brother, T. G. Skinner, and together they formed a company in August 1910. This company, known as Skinner Union, manufactured the S.U. carburettor, and it is of interest that some of its original features are retained in the present-day model. George Skinner had his own ideas on children’s education and did not believe in early schooling. His son Herbert was accordingly 9 years old before he entered Durston House School at Ealing. The son had evidently inherited some of his father’s ability for, five years later, he won a mathematical scholarship to Rugby School and entered School House in September 1914. His progress at Rugby was marked by success: he won prizes both in mathematics and natural sciences and, when he left school in 1919, he was head boy of the science side and also head of School House. In October of that year Skinner entered Trinity College, Cambridge. He had won both a major and a minor leaving Exhibition from Rugby in mathematics and the natural sciences respectively. After a successful undergraduate career he obtained in the summer of 1922 a first-class in Part II of the Natural Sciences Tripos, having earlier been placed in the first class of Part I of the Mathematical Tripos. For the next five years Skinner carried out research work in the Cavendish Laboratory and for part of this time he held the Coutts Trotter Studentship of Trinity College.

scholarly journals Extended depth-of-field microscopy with a high-speed deformable mirror

2017 ◽  
Vol 42 (5) ◽  
pp. 995 ◽  
Author(s):  
William J. Shain ◽  
Nicholas A. Vickers ◽  
Bennett B. Goldberg ◽  
Thomas Bifano ◽  
Jerome Mertz
Keyword(s):  
High Speed ◽  
Deformable Mirror ◽  
Depth Of Field ◽  
Extended Depth Of Field

scholarly journals Design and Evaluation of Uniform LED Illumination Based on Double Linear Fresnel Lenses

2020 ◽  
Vol 10 (9) ◽  
pp. 3257
Author(s):  
Hoang Vu ◽  
Ngoc Minh Kieu ◽  
Do Thi Gam ◽  
Seoyong Shin ◽  
Tran Quoc Tien ◽  
...  
Keyword(s):  
High Speed ◽  
Field Experiments ◽  
Numerical Control ◽  
Free Form ◽  
Light Sources ◽  
Cnc Machine ◽  
Led Lighting ◽  
Positive Effects ◽  
Fresnel Lenses ◽  
Linear Fresnel Lenses

Redistribution of LED radiation in lighting is necessary in many applications. In this article, we propose a new optical component design for LED lighting to achieve a higher performance. The design consists of a commercial collimator and two linear Fresnel lenses. The LED radiation is collimated by a collimator and redistributed by double linear Fresnel lenses to create a square-shaped, uniform distribution. The linear Fresnel lenses design is based on Snell’s law and the “edge-ray principle”. The optical devices are made from poly methyl methacrylate (PMMA) using a high-speed computer numerical control (CNC) machine. The LED prototypes with complementary optics were measured, and the optical intensity distribution was evaluated. The numerical results showed we obtained a free-form lens that produced an illumination uniformity of 78% with an efficiency of 77%. We used the developed LED light sources for field experiments in agricultural lighting. The figures of these tests showed positive effects with control flowering criteria and advantages of harvested products in comparison with the conventional LED sources. This allows our approach in this paper to be considered as an alternative candidate for highly efficient and energy-saving LED lighting applications.

Sign in / Sign up

Export Citation Format

Share Document