Irene Colomar's research while affiliated with Instituto de Ciencia de Materiales de Madrid and other places

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Publications (1)

(a) Schematic depiction of the proposed quantum optomechanical device. The optomechanical resonator consisting of coupled photonic crystal nanobeam cavities (PCNCs) is embedded in a two-dimensional phononic crystal membrane. A tunable laser is used to probe the mode. (b) Schematics of the photonic crystal nanobeam cavities. FEM simulation of the normalized electric field distribution of the even (with a supermode shared between both beams) and odd optical modes of the proposed optomechanical resonator. (c) The unit cell of the Leaf design is shown in turquoise; red arrows depict the irreducible Brillouin zone (IBZ). Lattice constant a = 32.5 µm, b = 28.5 µm, notch depth c = 2.5 µm, notch width equals arm width d = 6 µm. (d) Simulated phononic band structure of the in-plane modes of the Leaf (black) and Square (blue) PnCs. The dotted lines and shaded areas highlight the bandgap edges and bands.
(a) Schematics of the different configurations of the PnC unit cell: The Leaf-PnC, the Square-PnC, and the double nanobeam resonator without any phononic shield. (b) Calculated mechanical Q-Spectrum of the optomechanical cavity's antisymmetric mechanical mode located within a phononic shield cell. Black: Leaf-PnC (notch depth = 2.5 µm), Blue: Square-PnC (notch depth = 0 µm), Red: optomechanical cavity without PnC. (c) Upper chart. Spring scheme illustrating the coupling between the nanobeams m1 (optical spring kopt, orange) and the phononic defect mode m2 (parametrically modulated coupling kcoupl, green) and the coupling between the phononic defect mode and the phononic shield (kPnC, purple). Lower chart. sketch of the optomechanical double beam within the central cell of the PnC. The springs model the coupling of the antisymmetric double beam mode to the symmetric waving mode of the Leaf. For the sake of simplicity, the PCNCs are depicted vertically here. See the Supporting Information for a thorough analysis of the angular dependency of the nanobeams on the regenerative coupling feature.
Evolution of the mechanical quality factor (upper chart) and Q-peak frequency (lower graph) within the phononic bandgap as a function of notch depth and nanobeam length. Note that the length of the nanobeam which maximizes the quality factor depends on the notch depth (see Supporting Information for further details).
(a) Mechanical quality factor of the coupled nanobeam optomechanical resonator normalized on the mechanical quality factor of beams without phononic shield structure versus the number of PnC-rows surrounding the central defect. Black: Leaf-PnC (notch = 2.5 um) at 65.11 MHz, Red: Square-PnC at 65.11 MHz, Orange: Leaf-PnC (notch = 2.5 µm) at 86.4 MHz (Q-peak frequency). (b) Detail of the Q-peak spectra for the Leaf-PnC structure for increasing PnC rows. (c) Intra cavity optical power needed to reach the minimum achievable phonon occupation number as a function of the normalized Q for three different thermal bath temperatures: 300 K, black solid line; 100 K, red solid line; and 4 K, orange solid line.
Exploring regenerative coupling in phononic crystals for room temperature quantum optomechanics
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May 2024

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Scientific Reports

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Irene Castro

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Irene Colomar

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Daniel Ramos

Quantum technologies play a pivotal role in driving transformative advancements across diverse fields, surpassing classical approaches and empowering us to address complex challenges more effectively; however, the need for ultra-low temperatures limits the use of these technologies to particular fields. This work comes to alleviate this problem. We present a way of phononic bandgap engineering using FEM by which the radiative mechanical energy dissipation of a nanomechanical oscillator can be significantly suppressed through coupling with a complementary oscillating mode of a defect of the surrounding phononic crystal (PnC). Applied to an optomechanically coupled nanobeam resonator in the megahertz regime, we find a mechanical quality factor improvement of up to four orders of magnitude compared to conventional PnC designs. As this method is based on geometrical optimization of the PnC and frequency matching of the resonator and defect mode, it is applicable to a wide range of resonator types and frequency ranges. Taking advantage of the, hereinafter referred to as, “regenerative coupling” in phononic crystals, the presented device is capable of reaching f × Q products exceeding 10E16 Hz with only two rows of PnC shield. Thus, stable quantum states with mechanical decoherence times up to 700 μs at room temperature can be obtained, offering new opportunities for the optimization of mechanical resonator performance and advancing the room temperature quantum field across diverse applications.

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