Inverse design is used to realize a compact Bragg grating (BG) with narrow stopband for filtering... more Inverse design is used to realize a compact Bragg grating (BG) with narrow stopband for filtering and sensing applications. Design policy was discussed for various conditions, and the BG with narrow stopband was experimentally verified.
We fabricated 1550nm-band, p-doped, InAs/InGaAlAs quantum-dot (QD) lasers on an InP(311)B substra... more We fabricated 1550nm-band, p-doped, InAs/InGaAlAs quantum-dot (QD) lasers on an InP(311)B substrate. The device showed extremely high temperature stability and lasing up to 120℃ was confirmed under CW condition.
We present two methods of improving wavelength sensitivity for multi-slot sub-wavelength Bragg gr... more We present two methods of improving wavelength sensitivity for multi-slot sub-wavelength Bragg grating (MS-SW BG) refractive index sensors. The sensor structure is designed to have high optical mode confinement in the gaps between the silicon pillars whereby the surrounding medium interaction is high, thus improving the sensitivity. Further sensitivity improvements are achieved by increasing the waveguide height or suspending the sensor. The second option, sensor suspension, additionally requires supporting modifications in which case various configurations are considered. After the optimization of the parameters the sensors were fabricated. For the case of a waveguide height increase to 500 nm, the sensitivity of 850 nm/RIU was obtained; for sensor suspension with fully etched holes, 922 nm/RIU; for the case of not fully etched holes, 1100 nm/RIU; with the sensor lengths of about 10 µm for all cases. These values show improvements by 16.5%, 25%, and 50.5%, respectively, compared to...
In this paper we show the optimization procedure and experimental results for suspended ladder Br... more In this paper we show the optimization procedure and experimental results for suspended ladder Bragg grating on silicon on insulator platform for both wavelength sensitivity and amplitude sensitivity. As results, by optimizing the structures for high wavelength sensitivity 1100 nm/RIU by simulation and 865 nm/RIU by experiment with sensor lengths of about 10 µm were obtained. On the other hand, for high amplitude sensitivity, 51.3 dB with medium 0.01 RIU change by simulation and 24.5 dB with medium 0.004 RIU change by experiment with sensor lengths of 32.2 µm and 38 µm respectively.
Graphene has received extensive research attention for its optical, electrical and physical prope... more Graphene has received extensive research attention for its optical, electrical and physical properties and adaptability with silicon photonic devices. Using it in a modulator useful effects are electro-, thermoor magneto-optic effects [1-3]. Among these effects electro-optic effect is the more desirable due to its low-voltage and high-speed operation [4]. For TE mode a slot waveguide (WG) was reported to be more effective by about twice than a rib waveguide from viewpoints of refractive index and absorption changes [5]. Especially for efficient absorption modulation with a larger extinction ratio (ER), a Bragg grating (BG) waveguide is effective by using wavelength shift of a steep side-lobe peak. For higher modulation and better fabrication tolerance larger slot counts seem important. In this work structural design of a silicon sub-wavelength multislot Bragg grating (SW-MS BG) with graphene on top is studied in terms of various parameters such as, silicon WG widths, duty ratios and...
14th Pacific Rim Conference on Lasers and Electro-Optics (CLEO PR 2020), 2020
First and second Bragg-grating modes in subwavelength grating multi-slot structures are newly emp... more First and second Bragg-grating modes in subwavelength grating multi-slot structures are newly employed for Si waveguide sensors. High sensitivities of 813 nm/RIU for the first mode or 30 dB for the second mode are simulated.
2020 Opto-Electronics and Communications Conference (OECC), 2020
Sub-wavelength multi-slot Bragg grating (SW-MS BG) waveguide sensors were developed. The structur... more Sub-wavelength multi-slot Bragg grating (SW-MS BG) waveguide sensors were developed. The structures were designed for compactness and high sensitivity. The fabricated device demonstrated a record-high sensitivity of 730 nm/RIU with a length of 9.5 µm.
The rapid development of nanotechnologies, especially methods of synthesis of metal nanoparticles... more The rapid development of nanotechnologies, especially methods of synthesis of metal nanoparticles, preparation of nanostructured surfaces and atomically thin two-dimensional materials such as graphene renewed the interest to the Surface Enhanced Raman Scattering (SERS). The effect of Raman scattering was discovered a long time ago and has been associated with the part of scattered light, which changes the frequency after the interaction with molecular vibrations. The part of such non-elastically scattered light is usually small, because of the low cross section for the Raman scattering. Nanosized features on the substrate, on which this organic molecule is deposited, can work as an optical plasmonic antenna for the incident and scattered light and by such a way increasing the efficiency of the Raman process in several orders. Another mechanism, which can influence the polarizability of molecules on nanosurface, and, as consequence, Raman signal, can be connected with the resonant tr...
We propose Bragg grating (BG) refractive index sensor composed of sub-wavelength grating multi-sl... more We propose Bragg grating (BG) refractive index sensor composed of sub-wavelength grating multi-slot (SWGMS) waveguides with single etch-step fabrication. To improve performances two-type gratings in a period are studied. Our simulated structure has length of 17.27 μm, a sensitivity (S) 663 nm/RIU and an extinction ratio (ER) of 29.7 dB.
Simulation and experiment results show that changing waveguide widths of arrayed waveguide gratin... more Simulation and experiment results show that changing waveguide widths of arrayed waveguide grating instead of changing lengths for obtaining larger channel window size the footprint of the whole device area can be reduced by about 10 %.
Optical Fiber Communication Conference (OFC) 2021, 2021
Two methods for refractive index sensitivity improvement of silicon SW-MS BG refractive index sen... more Two methods for refractive index sensitivity improvement of silicon SW-MS BG refractive index sensors were considered. Height parameter was optimized and suspended waveguides were introduced. Experimentally obtained values were 850 nm/RIU and 1100 nm/RIU, respectively.
Inverse design is used to realize a compact Bragg grating (BG) with narrow stopband for filtering... more Inverse design is used to realize a compact Bragg grating (BG) with narrow stopband for filtering and sensing applications. Design policy was discussed for various conditions, and the BG with narrow stopband was experimentally verified.
We fabricated 1550nm-band, p-doped, InAs/InGaAlAs quantum-dot (QD) lasers on an InP(311)B substra... more We fabricated 1550nm-band, p-doped, InAs/InGaAlAs quantum-dot (QD) lasers on an InP(311)B substrate. The device showed extremely high temperature stability and lasing up to 120℃ was confirmed under CW condition.
We present two methods of improving wavelength sensitivity for multi-slot sub-wavelength Bragg gr... more We present two methods of improving wavelength sensitivity for multi-slot sub-wavelength Bragg grating (MS-SW BG) refractive index sensors. The sensor structure is designed to have high optical mode confinement in the gaps between the silicon pillars whereby the surrounding medium interaction is high, thus improving the sensitivity. Further sensitivity improvements are achieved by increasing the waveguide height or suspending the sensor. The second option, sensor suspension, additionally requires supporting modifications in which case various configurations are considered. After the optimization of the parameters the sensors were fabricated. For the case of a waveguide height increase to 500 nm, the sensitivity of 850 nm/RIU was obtained; for sensor suspension with fully etched holes, 922 nm/RIU; for the case of not fully etched holes, 1100 nm/RIU; with the sensor lengths of about 10 µm for all cases. These values show improvements by 16.5%, 25%, and 50.5%, respectively, compared to...
In this paper we show the optimization procedure and experimental results for suspended ladder Br... more In this paper we show the optimization procedure and experimental results for suspended ladder Bragg grating on silicon on insulator platform for both wavelength sensitivity and amplitude sensitivity. As results, by optimizing the structures for high wavelength sensitivity 1100 nm/RIU by simulation and 865 nm/RIU by experiment with sensor lengths of about 10 µm were obtained. On the other hand, for high amplitude sensitivity, 51.3 dB with medium 0.01 RIU change by simulation and 24.5 dB with medium 0.004 RIU change by experiment with sensor lengths of 32.2 µm and 38 µm respectively.
Graphene has received extensive research attention for its optical, electrical and physical prope... more Graphene has received extensive research attention for its optical, electrical and physical properties and adaptability with silicon photonic devices. Using it in a modulator useful effects are electro-, thermoor magneto-optic effects [1-3]. Among these effects electro-optic effect is the more desirable due to its low-voltage and high-speed operation [4]. For TE mode a slot waveguide (WG) was reported to be more effective by about twice than a rib waveguide from viewpoints of refractive index and absorption changes [5]. Especially for efficient absorption modulation with a larger extinction ratio (ER), a Bragg grating (BG) waveguide is effective by using wavelength shift of a steep side-lobe peak. For higher modulation and better fabrication tolerance larger slot counts seem important. In this work structural design of a silicon sub-wavelength multislot Bragg grating (SW-MS BG) with graphene on top is studied in terms of various parameters such as, silicon WG widths, duty ratios and...
14th Pacific Rim Conference on Lasers and Electro-Optics (CLEO PR 2020), 2020
First and second Bragg-grating modes in subwavelength grating multi-slot structures are newly emp... more First and second Bragg-grating modes in subwavelength grating multi-slot structures are newly employed for Si waveguide sensors. High sensitivities of 813 nm/RIU for the first mode or 30 dB for the second mode are simulated.
2020 Opto-Electronics and Communications Conference (OECC), 2020
Sub-wavelength multi-slot Bragg grating (SW-MS BG) waveguide sensors were developed. The structur... more Sub-wavelength multi-slot Bragg grating (SW-MS BG) waveguide sensors were developed. The structures were designed for compactness and high sensitivity. The fabricated device demonstrated a record-high sensitivity of 730 nm/RIU with a length of 9.5 µm.
The rapid development of nanotechnologies, especially methods of synthesis of metal nanoparticles... more The rapid development of nanotechnologies, especially methods of synthesis of metal nanoparticles, preparation of nanostructured surfaces and atomically thin two-dimensional materials such as graphene renewed the interest to the Surface Enhanced Raman Scattering (SERS). The effect of Raman scattering was discovered a long time ago and has been associated with the part of scattered light, which changes the frequency after the interaction with molecular vibrations. The part of such non-elastically scattered light is usually small, because of the low cross section for the Raman scattering. Nanosized features on the substrate, on which this organic molecule is deposited, can work as an optical plasmonic antenna for the incident and scattered light and by such a way increasing the efficiency of the Raman process in several orders. Another mechanism, which can influence the polarizability of molecules on nanosurface, and, as consequence, Raman signal, can be connected with the resonant tr...
We propose Bragg grating (BG) refractive index sensor composed of sub-wavelength grating multi-sl... more We propose Bragg grating (BG) refractive index sensor composed of sub-wavelength grating multi-slot (SWGMS) waveguides with single etch-step fabrication. To improve performances two-type gratings in a period are studied. Our simulated structure has length of 17.27 μm, a sensitivity (S) 663 nm/RIU and an extinction ratio (ER) of 29.7 dB.
Simulation and experiment results show that changing waveguide widths of arrayed waveguide gratin... more Simulation and experiment results show that changing waveguide widths of arrayed waveguide grating instead of changing lengths for obtaining larger channel window size the footprint of the whole device area can be reduced by about 10 %.
Optical Fiber Communication Conference (OFC) 2021, 2021
Two methods for refractive index sensitivity improvement of silicon SW-MS BG refractive index sen... more Two methods for refractive index sensitivity improvement of silicon SW-MS BG refractive index sensors were considered. Height parameter was optimized and suspended waveguides were introduced. Experimentally obtained values were 850 nm/RIU and 1100 nm/RIU, respectively.
Uploads
Papers by Siler key