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Showing 1 to 12 of 228 entries
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Generation of integer and fractional vector beams with q-plates encoded onto a spatial light modulator.

Optics letters

Moreno I, Sanchez-Lopez MM, Badham K, Davis JA, Cottrell DM.
PMID: 26977695
Opt Lett. 2016 Mar 15;41(6):1305-8. doi: 10.1364/OL.41.001305.

We generate programmable vector beams with arbitrary q-plates encoded using a spatial light modulator system. Consequently, we can analyze new and exotic q-plate designs without the difficulty of fabricating individual plates. We show experimental results for positive and negative...

Nondiffracting Bessel beams with polarization state that varies with propagation distance.

Optics letters

Moreno I, Davis JA, Sánchez-López MM, Badham K, Cottrell DM.
PMID: 26625023
Opt Lett. 2015 Dec 01;40(23):5451-4. doi: 10.1364/OL.40.005451.

We generate nondiffracting Bessel beams whose polarization state varies with propagation distance. We use a reflective geometry where a single parallel-aligned spatial light modulator device is used to spatially modulate two orthogonal linear polarizations with two axicon phase profiles....

Vector Beam Polarization State Spectrum Analyzer.

Scientific reports

Moreno I, Davis JA, Badham K, Sánchez-López MM, Holland JE, Cottrell DM.
PMID: 28533509
Sci Rep. 2017 May 22;7(1):2216. doi: 10.1038/s41598-017-02328-5.

We present a proof of concept for a vector beam polarization state spectrum analyzer based on the combination of a polarization diffraction grating (PDG) and an encoded harmonic q-plate grating (QPG). As a result, a two-dimensional polarization diffraction grating...

Substantial variation in the timing of pollen production reduces reproductive synchrony between distant populations of .

Ecology and evolution

Whittet R, Cavers S, Cottrell J, Rosique-Esplugas C, Ennos R.
PMID: 28894569
Ecol Evol. 2017 Jun 15;7(15):5754-5765. doi: 10.1002/ece3.3154. eCollection 2017 Aug.

The ability of a population to genetically adapt to a changing environment is contingent not only on the level of existing genetic variation within that population, but also on the gene flow received from differently adapted populations. Effective pollen-mediated...

Perspectives in Primary Care: A Conceptual Framework and Path for Integrating Social Determinants of Health Into Primary Care Practice.

Annals of family medicine

DeVoe JE, Bazemore AW, Cottrell EK, Likumahuwa-Ackman S, Grandmont J, Spach N, Gold R.
PMID: 26951584
Ann Fam Med. 2016 Mar;14(2):104-8. doi: 10.1370/afm.1903.

No abstract available.

Diffraction gratings generating orders with selective states of polarization.

Optics express

Davis JA, Moreno I, Sánchez-López MM, Badham K, Albero J, Cottrell DM.
PMID: 26832474
Opt Express. 2016 Jan 25;24(2):907-17. doi: 10.1364/OE.24.000907.

We propose specially designed double anisotropic polarization diffraction gratings capable of producing a selective number of diffraction orders and with selective different states of polarization. Different polarization diffraction gratings are demonstrated, including linear polarization with horizontal, vertical and ±...

Encoding amplitude and phase information onto a binary phase-only spatial light modulator.

Applied optics

Davis JA, Valadéz KO, Cottrell DM.
PMID: 12699347
Appl Opt. 2003 Apr 10;42(11):2003-8. doi: 10.1364/ao.42.002003.

We report what to our knowledge is a new technique for encoding both amplitude and phase information onto a single binary-valued spatial light modulator. In our approach, we spatially modulate the diffraction efficiency of the filter. Light that is...

The genetic structures of a range of Douglas-fir provenance collections after planting in different European countries, assessed with two biochemical marker systems.

Biochemical systematics and ecology

Forrest I, Tabbener H, Cottrell J, Connolly T.
PMID: 11412951
Biochem Syst Ecol. 2001 Aug;29(8):769-792. doi: 10.1016/s0305-1978(01)00020-5.

Genetic diversities of Douglas-fir provenance trials planted on several European sites were compared using both isozyme and terpene markers. A principal coordinate analysis based on similarity coefficients calculated from isozyme data indicated that, with the exception of two populations,...

BIO-ELECTRIC POTENTIALS OF THE HEN'S EGG.

Science (New York, N.Y.)

Romanoff AL, Cottrell CL.
PMID: 17795311
Science. 1939 Nov 17;90(2342):471-2. doi: 10.1126/science.90.2342.471.

No abstract available.

Complications of pediatric trauma: effects on pediatric trauma anesthesia.

Current opinion in anaesthesiology

Cottrell DJ, Seidman PA.
PMID: 17016407
Curr Opin Anaesthesiol. 2001 Apr;14(2):233-6. doi: 10.1097/00001503-200104000-00017.

Pediatric trauma is a significant problem worldwide. The complications of pediatric trauma affect the emergency medical services provider, emergency physician, trauma surgeon, and anesthesiologist in different and challenging ways. Children have unique airway concerns, and require distinctive and safe...

Alveolar distraction osteogenesis for implant site development.

Oral and maxillofacial surgery clinics of North America

Batal HS, Cottrell DA.
PMID: 18088715
Oral Maxillofac Surg Clin North Am. 2004 Feb;16(1):91-109, vii. doi: 10.1016/j.coms.2003.10.003.

Alveolar distraction osteogenesis can be a valuable tool for implant site development. Simultaneous regeneration of hard and soft tissue and an overall decrease in treatment time compared with other methods of site preparation can be an advantage. The authors...

Fresnel lens-encoded binary phase-only filters for optical pattern recognition.

Optics letters

Davis JA, Cottrell DM, Davis JE, Lilly RA.
PMID: 19752927
Opt Lett. 1989 Jul 01;14(13):659-61. doi: 10.1364/ol.14.000659.

We describe a technique for reducing false signals from optical correlators using binary phase-only filters (BPOF's). Since the impulse-response function of the BPOF contains both the target object and the inverted version of it, the output consists of the...

Showing 1 to 12 of 228 entries