Multi-Path Interferometer Structures with Cleaved Silica Microspheres

• Type: Article in International Conference Proceedings Book
• Date: 2018

Authors

Gomes, AD (Author) Other; Silveira, B (Author) Other; Karami, F (Author) Other; Zibaii, MI (Author) Other; Latifi, H (Author) Other; Dellith, J (Author) Other; Becker, M (Author) Other; Rothhardt, M (Author) Other; Bartelt, H (Author) Other; Frazao, O (Author) FCUP

Conference proceedings International

Title: INTERFEROMETRY XIX

19th Interferometry Conference

San Diego, CA, AUG 21-23, 2018

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Other information

Authenticus ID: P-00P-V3G

DOI: 10.1117/12.2319082

Abstract (EN): Two multi-path interferometers were developed using cleaved silica microspheres. A microsphere on top of a singlemode fiber tip was cleaved with a focused ion beam. The asymmetry introduced in the structure generates a new set of optical paths due to random reflections inside the microsphere. The obtained reflection spectrum presents a random-like interferometric behavior with strong spectral modulation of around 3 dB amplitude. Two distinct regions can be observed when a fast Fourier transform is applied. The first involves two cavities at a lower frequency and the second region involves a band of frequencies that is originated by the random interferometric reflections. These two spectral characteristics can be separated using low-pass and high-pass filters, respectively. A correlation method was used to obtain a temperature response from the two-cavity component. A similar structure was also created in a microsphere of multimode fiber. The microsphere was cleaved by polishing the structure with a certain angle. The interference between the different optical paths can be seen as the superposition of several two-wave interferometers, which can be discriminated through signal processing. Temperature sensing was also explored with this structure. The sensitivity to temperature is more than 3-fold for smaller cavities. Moreover, a sensitivity enhancement is also verified if a correlation method is used.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6