Induced transparency in ring resonator devices
A microring resonator consists of a ring side-coupled to a bus waveguide, where the light exchange is achieved by means of evanescent coupling mechanism. It is a strong candidate for integrated optics due to its advantage of compact size, cascadable input/output ports, and the compatibility of CMOS...
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| Format: | Thesis |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/48068 |
| _version_ | 1811683442490867712 |
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| author | Zhang, Yanbing |
| author2 | Mei Ting |
| author_facet | Mei Ting Zhang, Yanbing |
| author_sort | Zhang, Yanbing |
| collection | NTU |
| description | A microring resonator consists of a ring side-coupled to a bus waveguide, where the light exchange is achieved by means of evanescent coupling mechanism. It is a strong candidate for integrated optics due to its advantage of compact size, cascadable input/output ports, and the compatibility of CMOS fabrication. The microring resonator can be used to create many interesting phenomena that are difficult to obtain in other classical configurations. This thesis focuses on the theoretical analysis and experimental realization of induced transparency in optical devices derived from ring resonators. In this thesis, I propose a ring-bus-ring Mach-Zehnder interferometer (RBRMZI) system based on a 3×3 coupler, and show that such a system can generate an electromagnetically induced transparency (EIT)-like spectrum via phase engineering facilitated by inter-pathways interference between RBR and MZI, instead of separate light interaction in two resonators alone. Both the transfer matrix formalism and the temporal coupled mode theory are investigated to model this induced transparency. The relationship between the two theories is obtained via the energy-conservation and Q-factors. In addition, the EIT-like spectrum in the RBRMZI is experimentally realized using silicon-on-insulator technology. The best RBRMZI device has a transparency with a bandwidth of 0.25nm, a free spectral range of 12nm and a Q-factor of ~6300. With further measurements of the devices having strong ring-bus coupling, we obtain a Q~18000 when the circumference of one ring is 43.4μm and the circumference of the other ring is slightly detuned by ~0.035%. Moreover, we achieve a roundtrip loss as small as ~0.5% of the input energy. The measurement results agree well with theoretical prediction and 2D-FDTD numerical calculations. |
| first_indexed | 2024-10-01T04:12:48Z |
| format | Thesis |
| id | ntu-10356/48068 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:12:48Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/480682023-07-04T16:12:46Z Induced transparency in ring resonator devices Zhang, Yanbing Mei Ting Zhang Dao Hua School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits A microring resonator consists of a ring side-coupled to a bus waveguide, where the light exchange is achieved by means of evanescent coupling mechanism. It is a strong candidate for integrated optics due to its advantage of compact size, cascadable input/output ports, and the compatibility of CMOS fabrication. The microring resonator can be used to create many interesting phenomena that are difficult to obtain in other classical configurations. This thesis focuses on the theoretical analysis and experimental realization of induced transparency in optical devices derived from ring resonators. In this thesis, I propose a ring-bus-ring Mach-Zehnder interferometer (RBRMZI) system based on a 3×3 coupler, and show that such a system can generate an electromagnetically induced transparency (EIT)-like spectrum via phase engineering facilitated by inter-pathways interference between RBR and MZI, instead of separate light interaction in two resonators alone. Both the transfer matrix formalism and the temporal coupled mode theory are investigated to model this induced transparency. The relationship between the two theories is obtained via the energy-conservation and Q-factors. In addition, the EIT-like spectrum in the RBRMZI is experimentally realized using silicon-on-insulator technology. The best RBRMZI device has a transparency with a bandwidth of 0.25nm, a free spectral range of 12nm and a Q-factor of ~6300. With further measurements of the devices having strong ring-bus coupling, we obtain a Q~18000 when the circumference of one ring is 43.4μm and the circumference of the other ring is slightly detuned by ~0.035%. Moreover, we achieve a roundtrip loss as small as ~0.5% of the input energy. The measurement results agree well with theoretical prediction and 2D-FDTD numerical calculations. MASTER OF ENGINEERING (EEE) 2012-03-01T01:50:58Z 2012-03-01T01:50:58Z 2012 2012 Thesis Zhang, Y. (2012). Induced transparency in ring resonator devices. Master’s thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/48068 10.32657/10356/48068 en 80 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits Zhang, Yanbing Induced transparency in ring resonator devices |
| title | Induced transparency in ring resonator devices |
| title_full | Induced transparency in ring resonator devices |
| title_fullStr | Induced transparency in ring resonator devices |
| title_full_unstemmed | Induced transparency in ring resonator devices |
| title_short | Induced transparency in ring resonator devices |
| title_sort | induced transparency in ring resonator devices |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Electronic circuits |
| url | https://hdl.handle.net/10356/48068 |
| work_keys_str_mv | AT zhangyanbing inducedtransparencyinringresonatordevices |