CN110412668A - A structure producing multiple surface lattice resonances and its application - Google Patents

Abstract

The invention discloses a kind of structures and its application for generating multiple surface lattice resonance, belong to micro-nano photonic device technical field, including substrate, phasmon molecule is placed in the substrate, for the phasmon molecular ordered arrangement at array architecture, the phasmon molecule is the condensate being made of nanogold or nano silver cellular construction；Phasmon molecular array structure provided by the invention can generate multiple surface lattice resonance, using the structure fabrication at surface phasmon chip of laser can excite multiple surface lattice resonance well, and it can be in multiple wave bands while inhibition system radiation loss, multiple wave bands are modulated, it is emitted the nanometer laser of multiple wave bands, this is of great significance to the development of Information Integration.

Description

A structure producing multiple surface lattice resonances and its application

technical field

The invention belongs to the technical field of micro-nano photonic devices, and in particular relates to a structure for generating multiple surface lattice resonances and an application thereof.

Background technique

Nanolaser is the frontier field developed by the combination of traditional semiconductor laser and micro-nano photonics, which is of great significance to the design of micro-nano photonic devices. At the same time, limited by the "three-dimensional optical diffraction limit", the development of integration and miniaturization of nano-lasers has been greatly challenged, but surface plasmon lasers can overcome the diffraction limit and limit light to sub-wavelength regions. At present, the surface plasmon laser system has a large radiation loss, which leads to a decrease in the quality factor and a weakening of the local field strength.

Surface lattice resonance is a resonance mode excited by the coupling excitation of local surface plasmon resonance and array Rayleigh anomaly in nanoparticle arrays. It can well confine the incident field energy in the array structure, thereby effectively suppressing the radiation loss of the system. , and significantly increases the local field strength. However, at present, a single surface lattice resonance can only regulate the spectrum in a single band, and cannot simultaneously suppress the radiation loss of the system in multiple bands, so that simultaneous modulation of multiple bands cannot be realized.

Contents of the invention

The present invention provides a structure for generating multiple surface lattice resonances and its application, which solves the above-mentioned technical problems. Based on the plasmon molecular array structure, the present invention designs a multimode structure capable of producing multiple surface lattice resonances. The surface plasmon laser chip realizes the purpose of simultaneously suppressing the radiation loss of the system in multiple bands.

The first object of the present invention is to provide a structure that generates multiple surface lattice resonances, including a plurality of plasmonic molecules, the plurality of plasmonic molecules are arranged in an array structure, and the plasmonic molecules Metamolecules are polymers composed of nano-gold or nano-silver unit structures.

Preferably, the unit structure is nanodisk, nanorod, nanotriangle or nanoring.

Preferably, the polymer is a trimer, tetramer or pentamer.

Preferably, the polymer symmetry belongs to a D _nh , D _nd , D _n , C _nh , C _nv or C _n point group, where n is an integer > 2.

The second object of the present invention is to provide the application of the above-mentioned structure generating multiple surface lattice resonances in surface plasmon laser chips.

The third object of the present invention is to provide a surface plasmon laser chip, which includes a substrate on which the above-mentioned structure for generating multiple surface lattice resonances is arranged.

Compared with the prior art, the present invention has the following beneficial effects:

The plasmon molecular array structure provided by the present invention can generate multiple surface lattice resonances, and the surface plasmon laser chip made by using this structure can well excite multiple surface lattice resonances, and can generate multiple surface lattice resonances in multiple wave bands. At the same time, it suppresses the radiation loss of the system, modulates multiple bands, and emits nano-lasers of multiple bands, which is of great significance to the development of information integration.

Description of drawings

Fig. 1 is a schematic structural diagram of a multimode surface plasmon laser chip in Embodiment 1;

Fig. 2 is embodiment 1 disc trimer C _2V molecular point group;

Fig. 3 is the transmission spectrogram of embodiment 1 trimer molecule array;

4 is a schematic structural diagram of a multimode surface plasmon laser chip in Embodiment 2;

Fig. 5 is embodiment 2 disc tetramer C _2V molecular point group;

Fig. 6 is the transmission spectrogram of embodiment 2 tetramer molecular array;

7 is a schematic structural diagram of a multimode surface plasmon laser chip in Embodiment 3;

8 is a schematic structural diagram of a multimode surface plasmon laser chip in Embodiment 4;

Fig. 9 is the molecular point group of disc pentamer D _2h in Example 4.

Detailed ways

In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below in conjunction with specific examples and accompanying drawings, but the given examples are not intended to limit the present invention.

The invention provides a structure for generating multiple surface lattice resonances, including a plurality of plasmonic molecules arranged in an orderly array structure, and the plasmonic molecules are made of nano-gold or nano-silver A polymer composed of unit structures, the unit structure can be nanodisk, nanorod, nanotriangle or nanoring, the polymer can be trimer, tetramer or pentamer, and the symmetry of the polymer belongs to D _nh , D _nd , D _n , C _nh , C _nv or C _n point group, wherein n is an integer ≥ 2; we will take gold nanodisks as an example below to illustrate the structure that produces multiple surface lattice resonances provided by the present invention, and to make use of the above structure A surface plasmon laser chip.

Example 1

A structure that produces multiple surface lattice resonances. The gold nanodisk trimer C _2V molecules are arranged in an orderly array structure. As shown in Figure 2, the gold nanodisk trimer C _2V molecules are composed of three with the same thickness and diameter Consists of gold nanodisks of different sizes, wherein the diameters of the two small gold nanodisks are equal, the radius of the small gold nanodisk is r=80nm, the radius of the large gold nanodisk is R=150nm, s=240nm, g=290nm, the thickness of the large and small gold nanodisk Both are h=50nm; as shown in Figure 1, the above-mentioned array structure is etched on the quartz-PMMA (polymethyl methacrylate) substrate by ion/electronic etching method to make a multi-mode surface plasmon laser chip.

In order to test the performance of the above-mentioned plasmonic laser chip, through the electron beam etching experiment, the prepared sample is immersed in the oil that matches the set refractive index for measurement, and the corresponding transmission spectrum is obtained (see the left side of Fig. 3 ), through the finite difference time domain (FDTD) simulation, set the refractive index of the surrounding environment to 1.48, and calculate the transmission spectrum (see Figure 3 right); from Figure 3, the results of the experiment and calculation simulation have a good Fitting: When the polarization direction of the incident field is in the x direction, keep the period P _y in the direction perpendicular to the polarization direction of the incident field at 750nm, and change the period P _x (650nm, 750nm, 850nm) in the direction parallel to the polarization direction of the incident field to be above 1000nm respectively Multiple sharp resonance peaks appear at the position of , that is, the multiple surface lattice resonance mode generated by the coupling of the local resonance mode and the Rayleigh anomaly of the array.

Example 2

A structure that produces multiple surface lattice resonances. The tetrameric C _2V molecules of gold nanodisks are arranged in an orderly array structure. As shown in Figure 5, the tetrameric C _2V molecules of gold nanodisks are composed of four gold nanodisks. , where the radius of the two small gold nanodisks is r=70nm, the radius of the two large gold nanodisks is R=90nm, s ₁ =170nm, s ₂ =240nm, s ₃ =240nm, the thickness of the large and small gold nanodisks is h =50nm; As shown in Figure 4, above-mentioned array structure is etched on the quartz-PMMA substrate by ion/electron etching method, makes multi-mode surface plasmon laser chip;

As shown in Figure 6, the electron beam etching experiment shows that when the polarization direction of the incident field is the x direction, the period P _y on the polarization direction perpendicular to the incident field is maintained at 750nm, and the period P _x on the polarization direction parallel to the incident field is changed (650nm , 750nm, 850nm) achieved multiple surface lattice resonances respectively.

Example 3

A structure that produces multiple surface lattice resonances. The gold nanodisk trimer D _3h molecules are arranged in an orderly array structure. The trimer D _3h molecular point group is composed of three gold nanodisks of the same size. Disc radius r=80nm, gold nanodisc center spacing s=175nm, gold nanodisk thickness h=50nm, above-mentioned array structure is etched on quartz-PMMA substrate by ion/electron etching method, as shown in Figure 7, manufacture The effect of the multi-mode surface plasmon laser chip is the same as that of Embodiment 1, and multiple surface lattice resonances can also be realized.

Example 4

A structure that produces multiple surface lattice resonances. The gold nanodisk pentamer D _2h molecules are arranged in an orderly array structure. As shown in Figure 9, the pentamer D _2h molecular point group is composed of five gold nanodisks. Wherein four small gold nano-discs have the same size, set the radius of the large gold nano-disc R=120nm, the radius of the small gold nano-disc r=60nm, s ₁ =200nm, s ₂ =360nm, and the thickness of the gold nano-disc is h=50nm, as shown in Figure 8 As shown, the above-mentioned array structure is etched on the quartz-PMMA substrate by ion/electron etching, the effect is the same as that of embodiment 1, and multiple surface lattice resonance can also be realized.

In summary, the plasmonic molecular array structure provided by the present invention can generate multiple surface lattice resonances, and the surface plasmon laser chip made of this structure can well excite multiple surface lattice resonances, and It can simultaneously suppress the radiation loss of the system in multiple bands, modulate multiple bands, and emit nano-lasers in multiple bands, which is of great significance to the development of information integration.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, it is also intended to include these modifications and variations.

Claims (6)

1. A structure that produces multiple surface lattice resonances, characterized in that it includes a plurality of plasmonic molecules, and a plurality of the plasmonic molecules are arranged in an orderly array structure, and the plasmonic molecules are A polymer composed of nano-gold or nano-silver unit structure. 2. The structure for generating multiple surface lattice resonances according to claim 1, wherein the unit structure is a nanodisk, a nanorod, a nanotriangle or a nanoring. 3. The structure producing multiple surface lattice resonance according to claim 1, characterized in that the polymer is a trimer, tetramer or pentamer. 4. The structure producing multiple surface lattice resonances according to claim 3, characterized in that the aggregate symmetry belongs to a _Dnh , _Dnd , _Dn , _Cnh , _Cnv or _Cn point group, wherein n is an integer of ≥2. 5. An application of the structure producing multiple surface lattice resonances as claimed in any one of claims 1 to 4 in surface plasmon laser chips. 6. A surface plasmon laser chip, comprising a substrate, characterized in that the structure for generating multiple surface lattice resonances according to any one of claims 1 to 4 is arranged on the substrate.