Introduction to the issue on nanophotonics

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Fabrication of high-speed resonant cavity enhanced schottky photodiodes

We report the fabrication and testing of a GaAs-based high-speed resonant cavity enhanced (RCE) Schottky photodiode. The top-illuminated RCE detector is constructed by integrating a Schottky contact, a thin absorption region (In0.8Ga0.92As) and a distributed AlAs-GaAs Bragg mirror. The Schottky contact metal serves as a high-reflectivity top mirror in the RCE detector structure. The devices were fabricated by using a microwave-compatible fabrication process. The resulting spectral photo response had a resonance around 895 nm, in good agreement with our simulations. The full-width-at-half-maximum (FWHM) was 15 nm, and the enhancement factor was in excess of 6. The photodiode had an experimental setup limited temporal response of 18 ps FWHM, corresponding to a 3-dB bandwidth of 20 GHz

High-speed >90% quantum-efficiency p-i-n photodiodes with a resonance wavelength adjustable in the 795-835 nm range

We report GaAs/AlGaAs-based high-speed, high-efficiency, resonant cavity enhanced p-i-n photodiodes. The devices were fabricated by using a microwave-compatible fabrication process. By using a postprocess recess etch, we tuned the resonance wavelength from 835 to 795 nm while keeping the peak efficiencies above 90%. The maximum quantum efficiency was 92% at a resonance wavelength of 823 nm. The photodiode had an experimental setup-limited temporal response of 12 ps. When the system response is deconvolved, the 3 dB bandwidth corresponds to 50 GHz, which is in good agreement with our theoretical calculations. © 1999 American Institute of Physics

100-GHz resonant cavity enhanced Schottky photodiodes

Resonant cavity enhanced (RCE) photodiodes are promising candidates for applications in optical communications and interconnects where ultrafast high-efficiency detection is desirable. We have designed and fabricated RCE Schottky photodiodes in the (Al, In) GaAs material system for 900-nm wavelength. The observed temporal response with 10-ps pulsewidth was limited by the measurement setup and a conservative estimation of the bandwidth corresponds to more than 100 GHz. A direct comparison of RCE versus conventional detector performance was performed by high speed measurements under optical excitation at resonant wavelength (895 nm) and at 840 nm where the device functions as a single-pass conventional photodiode. A more than two-fold bandwidth enhancement with the RCE detection scheme was demonstrated

The Effect of Education on the Early Diagnosis of Breast and Cervix Cancer on the Women’s Attitudes and Behaviors Regarding Participating in Screening Programs

The objective of this paper was to define the effect of education on the early diagnosis of breast and cervix cancer on the women's attitudes and behaviors regarding participating in Cancer Early Diagnosis, Screening and Training Centers-CEDSTC screening programs. This semi-experimental study was completed with 342 women. The data were collected with forms “Champion’s Health Belief Model Scale Breast Cancer-HBMSBC” and “Health Belief Model Scale for Cervical Cancer and the Pap Smear Test-HBMSCCPST.” When the women’s health beliefs before and after 6 months of the education about the early diagnosis of breast and cervical cancers are considered, it is seen that the HBMSBC subscales health motivation, breast self-examination (BSE), and evasion to mammography (MMG) decreased and BSE self-efficacy and MMG benefit attitudes increased and HBMSCCPST subscales pap smear benefit attitudes increased and evasion to pap smear attitude decreased (p < 0.05). Six months after the education, 28.4% of the women had undergone MMG, 69.9% had performed BSE, and 33.6% had undergone a pap smear test. Education regarding early diagnosis of breast and cervix cancer was found to have positive effects on the health behaviors of the women related to BSE, MMG, and pap smear tests. The women require professional education program for increasing their attitudes and behaviors for CEDSTC screening programs. We suggest regularly providing education to increase participation in early screening programs. © 2017, American Association for Cancer Education.Firat University Scientific Research Projects Management UnitThe authors are grateful to all the participants in the study. We offer our heartfelt thanks to the Provincial Public Health Director of that period who gave support and an official vehicle and staff while visiting the villages and towns of Ni?de Province center when conducting this study. We want to state that we are thankful to all midwives, nurses, and officials working at Ni?de CEDSTC who supported the implementation of our project for their help and to Ni?de University Z?beyde Han?m School of Health Department of Nursing and Midwifery students who helped collect the data. This study was presented as an oral presentation at the First International Congress on Women and Child Health and Training on 14?15 April 2016 in Kocaeli, Turkey. This study was presented as oral presentation at First International Congress on Women and Child Health and Training, 14?15 April 2016, Kocaeli, Turkey The authors declare that they have no conflicts of interest. The author(s) disclosed receipt of the following financial support for the research and/or authorship of this article. This research was supported by Ni?de University Scientific Research Project (Project no: SSB2012/01)

High-speed high-efficiency large-area resonant cavity enhanced p-i-n photodiodes for multimode fiber communications

The large active-area AlGaAs-GaAs p-i-n photodiodes were reported with a 3-dB bandwidth in excess of 10 GHz for devices as large as 60μmeter diameter. Resonant cavity enhanced photodetection was employed to improve the quantum efficiency. Performance of photodiodes exceeded the requirement for 10-Gb/s optical communication system. A bandwidth of more than 20 GHz was attainable for photodiodes having 50 μmeter diameter with potential for 40-Gbs application, with a factor of two reduction in the load resistance