Quantum projection synthesis can be used for phase-probability-distribution measurement and optical-state truncation and preparation. The method relies on interfering optical light beams, which is a ...major challenge in experiments performed by pulsed light sources. In the pulsed regime, the time frequency overlap of the interfering light beams has a major impact on the efficiency of the method. In this paper, the pulse-mode projection-synthesis approach is developed, the mode structures of interfering light beams are characterized, and the effect of this overlap on the fidelity of optical-state truncation and preparation is investigated. By introducing the positive-operator-valued measure for the detection events in the scheme, the effect of mode mismatch between the photon-counting detectors and the incident light beams is also presented.
We report the first demonstration of single nanoparticle detection and size measurement in water using mode splitting in high-Q optical resonators. We achieved detecting and measuring polystyrene ...individual nanoparticles down to 75 nm in radius.
Hybrid photonic molecules Bo Peng; Ozdemir, S. K.; Jiangang Zhu ...
2012 Conference on Lasers and Electro-Optics (CLEO)
Conference Proceeding
We report spectral tuning of coupled whispering-gallery-mode microresonators formed with different geometries and materials. Thermal tuning is utilized to achieve spectral overlap and mode splitting ...is studied as a function of coupling distance.
Objective: To assess the Internet addiction and depression level in university students. Methods: The present study is a cross-sectional study conducted on the students of Sakarya University between ...05 April and 05 July 2012. After the departments were selected by casting lots, 994 students who were randomly selected from each class constituted the study group. Students in the classrooms were informed about the objective and purpose of the study. Then they were asked to complete the previously prepared questionnaire under supervision. In the current study, the Internet Addiction Scale was used in order to assess the Internet addiction. The higher scores obtained in the scale represent higher level of Internet addiction. Depression was assessed with the Beck Depression Inventory. Students with a score of 17 and above were regarded to have suspected depression. Data were assessed in SPSS (version 15.0) Statistics Package Program on the computer. Student's t-test, One-Way Analysis of Variance and Spearman's Correlation Analysis were used for analyses. Statistical significance value was taken as p<0.05. Results: The study group consisted of 573 (57.6%) females and 421 (42.4%) males. They were aged between 18 and 26 with a mean age of 21.10 ± 1.71 years. The scores obtained by the students from the Internet Addiction Scale ranged between 0-90 with a mean score of 20.04±12.85. The scores obtained from the Beck Depression Inventory ranged between 0-53 with a mean score of 11.32±9.23. In our study, frequency of suspected depression was determined to be 23.0% (n=229). In the present study, Internet addiction level was determined to be higher in males, those with high family income, those staying in dormitory, smokers, those with an extroverted personality, those having Internet access, those using Internet once a day or more and students with suspected depression (p<0.05 for each). Discussion: Internet addiction is an important health problem in university students. A significant relationship was determined between Internet addiction and depression.
We present an add-drop filter (ADF) with a drop efficiency of 57% and quality factor of 4.5 × 10 6 composed of an on-chip whispering gallery mode (WGM) ultra-high quality factor (Q) microtoroid ...resonator side coupled to two taper fibers. Different than the exisiting microtoroid based ADF designs, we fabricated reflowed silica side walls along the microtoroid resonators to support the fiber-taper waveguides, not only making the alignment process easier but also providing mechanical stability. As an additional benefit, we observe that the drop-wavelength can be tuned without compromising drop efficiency.
We demonstrate that a whispering gallery mode (WGM) microtoroidal optical resonator retains its high quality factor Q >; 10 7 when encapsulated into a low index polymer matrix. We tested the packaged ...system in water with various salt concentrations and temperatures, and in air under various room conditions, showing that the polymer package keeps the resonator intact from degrading effects of environment, providing a robust and stable resonator-fiber coupling. The developed packaging technique provides portability to on-chip WGM resonators, enabling operations in the field.
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