Laser-Inscribed Diamond Waveguide Resonantly Coupled to Diamond Microsphere.

Nurperi Yavuz,Argyro Giakoumaki,Vibhav Bharadwaj,Roberta Ramponi,Mustafa Mert Bayer,Ali Serpengüzel,Thien Le Phu,Hüseyin Ozan Ҫirkinoğlu,Shane M Eaton

doi:10.3390/molecules25112698

Abstract

An all-diamond photonic circuit was implemented by integrating a diamond microsphere with a femtosecond-laser-written bulk diamond waveguide. The near surface waveguide was fabricated by exploiting the Type II fabrication method to achieve stress-induced waveguiding. Transverse electrically and transverse magnetically polarized light from a tunable laser operating in the near-infrared region was injected into the diamond waveguide, which when coupled to the diamond microsphere showed whispering-gallery modes with a spacing of 0.33 nm and high-quality factors of 105. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical applications in integrated diamond photonics.

Highlights

Silicon and silica are the most fundamental optical components in optical fibers, optical filters, optical amplifiers and photodetectors in integrated optical devices and photonic integrated circuits [1].Such applications in the quantum regime have been rapidly developing, and there is a continuous search for a more suitable and faster photonics platform to replace silicon [2]
We demonstrate an all-diamond photonic circuit, which performs the excitation of a 1 mm diamond microsphere via a fs-laser-written shallow diamond WG
Spherical diamond microresonators on fs-laser-written diamond WGs show promise as novel all-diamond integrated photonic architectural components. By carefully engineering these high-quality factor resonances, and further exploiting the properties of existing nitrogen-vacancy centers in diamond microspheres and diamond waveguides in such configurations, it should be possible to realize filtering, sensing and nonlinear optical [20,21] applications in integrated diamond [22,23] photonics

Summary

Introduction

Silicon and silica are the most fundamental optical components in optical fibers, optical filters, optical amplifiers and photodetectors in integrated optical devices and photonic integrated circuits [1]. Such applications in the quantum regime have been rapidly developing, and there is a continuous search for a more suitable and faster photonics platform to replace silicon [2]. The broad-band transparency of diamond with a refractive index of 2.4 [5] in the near-IR region facilitates the observation of whispering gallery modes (WGMs) between a closely spaced diamond waveguide (WG) and a diamond microsphere. Resonances from different circular microresonators such as silicon [7], silica [8] and diamond [4] were harvested for optical filtering [9], channel dropping [10], lasing [11]

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Conclusion