Mirror

FIELD: optical industry.

SUBSTANCE: mirror can be used when producing optical reflecting systems in lasers and experimental physics. Mirror has transparent dielectric base. Metal coating is applied onto the base. Coating has to nanoparticles, for example, silver nanoparticles, which have plasma resonance at electromagnet radiation frequency. The mirror intends to reflect the radiation. Linear dimensions are far smaller than the radiation wavelength. Nanoparticles are applied uniformly onto surface of the base to cover 15% of its area. Thickness of mirror is reduced to minimal size; size of spot of reflected radiation in focus is reduced.

EFFECT: reduced thickness of mirror; improved precision.

3 dwg

 

The invention relates to the field of optics, in particular to systems reflect electromagnetic radiation, including polling frequency, and can be used to create optical reflecting systems in lasers, for example, a semiconductor, in experimental physics and other

You know the Bragg mirror for reflecting optical systems, semiconductor lasers [1]. The disadvantage of this mirror is its relatively large thickness, which limits below the smallest size of a semiconductor laser.

Widely also known mirror comprising a transparent glass substrate and deposited on the specified base coating of metal (Nickel, chrome, silver), in particular mirror Mangina [2]was chosen as the prototype of the present invention. The disadvantage of this invention is its relatively large thickness, and the impossibility of selective frequency reflection of the incident electromagnetic radiation and a relatively large spot size of the reflected radiation in focus.

The purpose of this invention is to remedy these disadvantages and significant decrease in the maximum possible thickness of the mirror when the polling frequency the reflection of the incident electromagnetic radiation and the reduction of the spot size of the reflected radiation in focus.

The decree is fair, the goal of the proposed mirror, what is known in the mirror, consisting of a transparent dielectric substrate and deposited on the specified base metal coating, this coating is a metal nanoparticles, such as silver, having a plasma resonance at the frequency of electromagnetic radiation to reflect which is specified by the proposed mirror, and linear dimensions much smaller than the wavelength of the specified radiation deposited uniformly on the surface of the specified base so that the cover up to 15 percent of its area.

The essence of the invention set forth in the following description.

Figure 1 presents a schematic representation of the proposed mirror section, where:

1 - dielectric, for example, a parabolic mirror base aperture r,

2 - metal nanoparticles, such as silver.

Figure 2 presents the dependence of the reflection coefficient κ (in relative units) of the proposed mirror from the wavelength of the incident electromagnetic radiation λ um.

Figure 3 presents the dependence is expressed in units of the wavelength of the reflected electromagnetic radiation spot radius R specified radiation at half-height of its power in the focus of the proposed mirror radius of the aperture of the specified mirror r, expressed in units of the focal length be the con.

The reflection of electromagnetic radiation in the proposed mirror is as follows:

Electromagnetic waves incident on the surface of the specified mirror coated with nanoparticles of metals (particularly silver) (see Figure 1), causing oscillations of free electrons of these nanoparticles. Since the excitation of these oscillations has a resonant character on the plasma resonance frequency determined by the nature of the material, the shape and size of these nanoparticles and the nature of the material specified dielectric substrate, it is mainly the re-radiation (reflection) corresponding to the narrow part of the spectrum of wavelengths incident on the mirror of electromagnetic radiation. The rest of electromagnetic radiation passes through the mirror almost without reflection and absorption.

By calculating the polarizability of a spherical silver nanoparticles on the surface of the glass (SiO2)and considering that the reflection coefficient of the incident on the mirror of electromagnetic radiation is proportional to the square of the specified polarizability, we find the dependence of the specified reflectance to the wavelength of the specified radiation λ. This dependence has the form of a resonance curve with a maximum at λ=0.41 μm (see Figure 2). The width of the curve is equal to about 10 n is.

Reflected from the surface of the proposed mirror radiation is a result of interference of dipole radiation nanoparticles of metal (silver). Calculations show (see figure 3)that the spot size of the radiation in the focus of the considered parabolic mirror decreases rapidly with increasing radius of its aperture (approximately as l/r2), and the intensity of the peak increases accordingly.

An example implementation of the proposed mirror:

On a polished glass surface (SiO2) parabolic form a layer of polymer (polystyrene) with a thickness of 30-40 nm. On the specified layer of the polymer uniformly, by centrifugation of the solution, applied silver nanoparticles with a diameter of 20-30 nm. The deposition process is controlled and stops when the specified silver nanoparticles cover 10-15% of the said parabolic surface. Next, the resulting heterology consisting of polystyrene and applied silver nanoparticles is heated to a temperature above the glass transition temperature of polystyrene. These nanoparticles are immersed in the layer of polystyrene, where and are fixed during cooling of the specified heterology. Thus, the mirror reflects with a coefficient close to unity, electromagnetic radiation in the wavelength range of 0.40-0,41 nm and passes without absorbing all on the other spectrum. Received the mirror has a thickness of reflecting layer about 40 nm, which is significantly less than the minimum thickness of the reflecting layers of all known mirrors.

Literature

1. "Handbook of Semiconductor Lasers and Photonic Integrated Circuits" ed. Y.Sucmadsu and A.R.Adonis, London, 1994, p.510-515.

2. Martin, Technical optics, FM, Moscow, 1960, str.

Mirror, consisting of a transparent dielectric substrate and deposited on the specified base metal coating, characterized in that the said coating is a metal nanoparticles, such as silver, having a plasma resonance at the frequency of electromagnetic radiation to reflect which is specified by the proposed mirror, and linear dimensions much smaller than the wavelength of the specified radiation deposited uniformly on the surface of the specified base so that the cover up to 15% of its area.



 

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