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Numerical investigations of an ultra-compact polarization beam splitter based on augmented low-index guiding and subwavelength grating structures.
| Content Provider | Europe PMC |
|---|---|
| Author | Huang, Chia-Chien |
| Abstract | We report the design of an ultra-compact polarization beam splitter with high performance that is based on augmented low-index guiding and subwavelength grating (SWG) structures. The transverse-electric (TE) and transverse-magnetic (TM) modes are confined in high-index silicon (Si) and low-index silicon nitride (Si3N4), respectively. They are separated by using, respectively, a gradually curved Si waveguide and a Si3N4 SWG structure with optimal grating-element. The footprint of the proposed polarization beam splitters (PBS) is 2.9 × 2.25 μm2. The device offers high polarization extinction ratios (PERs) of ~18 dB for the two polarizations, with low insertion losses of ~0.22 dB (~0.71 dB) for the TE (TM) mode at the wavelength of 1550 nm. Over the broad band from λ = 1500-1650 nm, the PERs of the TE and TM modes are above 17 and 16 dB, respectively. By narrowing the operating band to the range from λ = 1500 to 1600 nm, the proposed PBS provides PERs of >17 dB for both polarizations. Finally, the fabrication tolerance of the designed PBS is also addressed and discussed in detail. |
| Journal | Scientific Reports [Sci Rep] |
| Volume Number | 8 |
| DOI | 10.1038/s41598-018-35841-2 |
| PubMed Central reference number | PMC6255808 |
| Issue Number | 1 |
| PubMed reference number | 30478393 |
| e-ISSN | 20452322 |
| Language | English |
| Publisher | Nature Publishing Group |
| Publisher Date | 2018-11-26 |
| Publisher Place | London |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
