Photon-pair generation at telecommunication wavelengths using high-quality silicon microring resonators is an active area of research. Here, we report on significant progress towards the ultimate goal of an integrated silicon microchip for bright generation of photon pairs with multiple stages of tunable optical filtering on the same chip. A high pair generation brightness of 6.5×1010pairs/s/mW2/nm is achieved. The resonance of the high-Q silicon microring resonator can be monitored using a high dynamic range readout of a photocurrent in an all-silicon p-i-n diode fabricated across the waveguide cross-section, which is used to align the ring resonance to the passbands or stopbands of the filters.
Spin-acoustic control of silicon vacancies in 4H silicon carbide
Bulk acoustic resonators can be fabricated on the same substrate as other components and can operate at various frequencies with high quality factors. Mechanical dynamic metrology of these devices is challenging as the surface information available through laser Doppler vibrometry lacks information about the acoustic energy stored in the bulk of the resonator. Here we report the spin-acoustic control of naturally occurring negatively charged silicon monovacancies in a lateral overtone bulk acoustic resonator that is based on 4H silicon carbide. We show that acoustic driving can be used at room temperature to induce coherent population oscillations. Spin-acoustic resonance is shown to be useful as a frequency-tunable probe of bulk acoustic wave resonances, highlighting the dynamical strain distribution inside a bulk acoustic wave resonator at ambient operating conditions. Our approach could be applied to the characterization of other high-quality-factor microelectromechanical systems and has the potential to be used in mechanically addressable quantum memory.
more » « less- Award ID(s):
- 1839164
- NSF-PAR ID:
- 10464252
- Publisher / Repository:
- Nature Publishing Group
- Date Published:
- Journal Name:
- Nature Electronics
- Volume:
- 6
- Issue:
- 10
- ISSN:
- 2520-1131
- Format(s):
- Medium: X Size: p. 739-745
- Size(s):
- p. 739-745
- Sponsoring Org:
- National Science Foundation
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