Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics

Jian Liu; Ka-Di Zhu

doi:doi:10.1364/PRJ.6.000867

Photonics Research, 2018, 6 (9): 09000867, Published Online: Aug. 15, 2018

Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics Download： 660次

Jian Liu ^1,2,3Ka-Di Zhu ^1,2,3,*

Author Affiliations

¹ Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shanghai 200240, China

² School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China

³ Collaborative Innovation Center of Advanced Microstructures, Nanjing 210000, China

Figures & Tables

Fig. 1. (a) Schematic diagram of the suspended graphene nanoribbon placed in the surface plasmonic cavity with presence of a strong pump beam and a weak probe beam; G points the direction of the gravity. The Ne atoms are deposited onto the surface of the graphene sheet in a special evaporator. (b) Displacement pattern of the atoms in the graphene nanoribbon due to the fundamental in-plane flexural resonance mode.

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Fig. 2. Energy level diagram of the SGR-plasmon optomechanical system, where M and c denote the number states of mechanical mode and plasmon cavity photon, respectively. The three pictures correspond to the physical processes of (a) Stokes scattering, (b) Rayleigh scattering, and (c) anti-Stokes scattering.

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Fig. 3. Strength of Rayleigh scattering on the probing absorption spectrum as a function of the probe-pump detuning δc for different quality factors of the plasmon. We set Ep=0; other parameter values are Ωs=0.1 THz, γ=0.5 GHz.

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Fig. 4. Plot of absorption spectrum as a function of probe-pump detuning with R=103 Å4·amu−1, g=200 GHz, Qc=10, and Δp=0 for I=1,2,and 3 kW/cm2, respectively. Other parameter values are the same as in Fig. 3.

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Fig. 5. Pump intensity dependence of the ratio between Raman and Rayleigh scattering strength with different optomechanical coupling rate g.

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Fig. 6. Absorption spectra of the probe pulse as a function of δ before (black line) and after the binding events of one Ne atom (blue line) and 10 atoms (red line). The frequency shifts induced by additional masses can be well distinguished in the spectra. Here we choose R=103 Å4 ·amu−1, I=1 kW/cm2. Other parameters used are the same as in Fig. 4.

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Table1. Parameters of the Plasmon Optomechanical System Used in the Mass Measurement

Parameter	Units	Value
Width of SGR, $w$	nm	0.7
Length of the SGR, $l$	nm	6
Fundamental frequency of SGR, $ω_{m}$	GHz	100
Frequency of the plasmon, $ω_{c}$	THz	330
Raman activity of F-mode, $R$	$Å^{4} \cdot {amu}^{- 1}$	$10^{3} - 10^{4}$
Volume of plasmon cavity, $V_{c}$	${μm}^{3}$	$1.5 \times 10^{- 6}$
Quality factor for SGR, $Q_{SG}$	Null	200
Quality factor for plasmon, $Q_{c}$	Null	10
Conservative quantum yield, $η$	Null	0.01
Pump-cavity detuning, $Δ_{p}$	Hz	0
Air pressure, $P$	Torr	1
Temperature, $T$	K	300

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Jian Liu, Ka-Di Zhu. Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics[J]. Photonics Research, 2018, 6(9): 09000867.

Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics Download： 660次

Fig. 3. Strength of Rayleigh scattering on the probing absorption spectrum as a function of the probe-pump detuning δc for different quality factors of the plasmon. We set Ep=0; other parameter values are Ωs=0.1 THz, γ=0.5 GHz.

Fig. 4. Plot of absorption spectrum as a function of probe-pump detuning with R=103 Å4·amu−1, g=200 GHz, Qc=10, and Δp=0 for I=1,2,and 3 kW/cm2, respectively. Other parameter values are the same as in Fig. 3.

Fig. 5. Pump intensity dependence of the ratio between Raman and Rayleigh scattering strength with different optomechanical coupling rate g.

Table1. Parameters of the Plasmon Optomechanical System Used in the Mass Measurement

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Room temperature optical mass sensor with an artificial molecular structure based on surface plasmon optomechanics Download： 660次

Fig. 3. Strength of Rayleigh scattering on the probing absorption spectrum as a function of the probe-pump detuning δc for different quality factors of the plasmon. We set Ep=0; other parameter values are Ωs=0.1 THz, γ=0.5 GHz.

Fig. 4. Plot of absorption spectrum as a function of probe-pump detuning with R=103 Å4·amu−1, g=200 GHz, Qc=10, and Δp=0 for I=1,2,and 3 kW/cm2, respectively. Other parameter values are the same as in Fig. 3.

Fig. 5. Pump intensity dependence of the ratio between Raman and Rayleigh scattering strength with different optomechanical coupling rate g.

Table1. Parameters of the Plasmon Optomechanical System Used in the Mass Measurement

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