Researcher:
Naghizadeh, Solmaz

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PhD Student

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Solmaz

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Naghizadeh

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Naghizadeh, Solmaz

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2012 - 20173

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Researcher Of Publications: search.filters.isAuthorOfPublication.ca996016-1e8e-4766-a793-d1f48f8b459e

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    Experimental investigation of stub resonators built in plasmonic slot waveguides
    (Ieee-Inst Electrical Electronics Engineers Inc, 2017) Karasahin, Aziz; N/A; N/A; Department of Electrical and Electronics Engineering; N/A; Naghizadeh, Solmaz; Kocabaş, Şükrü Ekin; Arısev, Ongun; PhD Student; PhD Student; Faculty Member; Master Student; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; N/A; N/A; N/A; N/A
    In this letter, we focus on stub resonators embedded in plasmonic slot waveguides. The resonators have potential applications in optical interconnects and sensors. We fabricate the samples by electron beam lithography and lift-off. We use a scattering matrix-based model to quantify the optical power output from the samples. We measure the properties of the resonators by coupling light in and out of the slot waveguides by optical antennas, making use of a cross-polarization-based setup utilizing a supercontinuum source and a high numerical aperture objective lens operating in the telecom-wavelength range. Our model agrees well with the measured data. Furthermore, development on the stub resonators can be made by using the methods in this letter.
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    Low-cost low-threshold diode end-pumped Tm:YAG laser at 2.016 um
    (Springer, 2012) Kurt, Adnan; N/A; N/A; Department of Physics; Beyatlı, Ersen; Naghizadeh, Solmaz; Sennaroğlu, Alphan; PhD Student; PhD Student; Faculty Member; Department of Physics; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Sciences; 229317; N/A; 23851
    We report a low-threshold continuous-wave Tm:YAG laser that can be excited near 785 nm with low-cost, single-mode AlGaAs laser diodes. Low-threshold operation was achieved using a tightly focused, astigmatically compensated x-cavity containing a 2-mm-thick Tm:YAG crystal with 5 % Tm3+ concentration. Two linearly polarized single-mode diodes operating at 785.8 nm were polarization coupled to end pump the resonator. With a 6 % output coupler, as high as 32 mW of output power could be obtained at 2016 nm with 184 mW of incident pump power. The output could be further tuned in the 1935-2035 nm range. Slope efficiency measurements indicated that cross-relaxation was very effective at this doping level. With a 2 % output coupler, lasing could be obtained with as low as 32.3 mW of pump power. In the limit of vanishing output coupling, the incident threshold pump power could be reduced to as low as 25 mW. To our knowledge, this is among the lowest lasing thresholds reported to date for continuous-wave, room-temperature thulium lasers.
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    Guidelines for designing 2D and 3D plasmonic stub resonators
    (Optical Soc Amer, 2017) N/A; N/A; Department of Electrical and Electronics Engineering; Naghizadeh, Solmaz; Kocabaş, Şükrü Ekin; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A
    In this work, we compare the performance of plasmonic waveguide integrated stub resonators based on 2D metal-dielectric-metal and 3D slot waveguide (SWG) geometries. We show that scattering matrix theory can be extended to 3D devices, and by employing scattering matrix theory, we provide the guidelines for designing plasmonic 2D and 3D single-stub and double-stub resonators with a desired spectral response at the design wavelength. We provide transmission maps of 2D and 3D double-stub resonators versus stub lengths, and we specify the different regions on these maps that result in a minimum, a maximum, or a plasmonically induced transparency shape in the transmission spectrum. Radiation loss from waveguide terminations leads to a degradation of the 3D SWG-based resonators. We illustrate improved waveguide terminations that boost resonator properties. We verify our results with 3D finite-difference time-domain (FDTD) simulations.