The optical probe on the basis of the quartz resonator for scanning probe microscope

 

The optical probe includes a crystal resonator and a vibration source mounted on the base, and an optical fiber mounted on a first arm of the quartz resonator by means of a clamp. The clamp contains a capture and installed on the base with the possibility of movement of the grip relative to the first shoulder of the quartz resonator, and the optical fiber is fixed on the base and located at an angle to the first shoulder of the crystal with the ability to change the angle. The clamp may be made in the form of two strips, the first of which is mounted on a base that can be rotated and moved in the plane perpendicular to the optical fiber, and the first strap installed a second strap can be rotated with respect to it in a plane parallel to the optical fiber, and can be locked in relation to it. Improved the sensitivity of the probe and the reliability of its use. 2 C.p. f-crystals, 6 ill.

The invention relates to nanotechnology, and more specifically to a device that ensures the removal of optical information from the surface of bodies using scanning probe microscope (SPM).

Known optical probe is attached is raised in that fixing the optical fiber on the shoulder of the quartz resonator made by glue. This leads to a decrease of the quality factor of the crystal and, consequently, to decrease the sensitivity of the probe.

Adhesive bonding is also low mounted, especially in conditions of thermal Cycling, for example when using the probe in the cryostat.

Along with this, the adhesive connection is not allows to adjust the q of the system in accordance with the viscosity measurement, temperature and other variables, which reduces the functionality of the device.

Also known is an optical probe that contains an optical fiber mounted on one arm of the quartz resonator by means of a spring clamp. Quartz resonator is fixed on the base and connected with a source of oscillations [2].

The first disadvantage of this device is that the spring clamp is in contact via the optical probe with the shoulder of the quartz resonator, which affects the frequency response and the quality of the device, and it reduces the sensitivity of the probe.

The second drawback is that the spring clip does not allow to fix opisywaniu fibers of quartz, accordingly, reduces the reliability of the device.

The technical result of the invention is to increase the sensitivity of the probe and the reliability of its use.

This is achieved in that in the optical probe on the basis of the crystal containing the quartz resonator and the source of vibrations, is fixed on the base, and an optical fiber mounted on a first arm of the quartz resonator by means of a clamp, the clamp includes capture and installed on the base with the possibility of movement relative to the first shoulder of the quartz resonator and interoperable engagement with the optical fiber fixed on the base and located at an angle to the first shoulder of the crystal with the ability to change the angle.

There is an option in which the possibility of progress clamp carried out by running it in the form of a first strap that is installed on the base can be rotated and moved in the plane perpendicular to the optical fiber, and a second strap mounted on the first strap with a possibility of rotation relative to it in a plane parallel to the optical fiber, and can be locked in relation to it.

Celesoobrazno fiber, height is less than the diameter of the optical fiber, and the length is larger than the diameter of the optical fiber.

In Fig.1 shows the optical probe on the basis of the quartz resonator, side view.

In Fig.2 is an embodiment of fixing the optical fiber on the ground.

In Fig.3 - option run down.

In Fig.4 is a variant of capture.

In Fig.5 - the first option to install the probe in the SPM.

In Fig.6 - the second option to install the probe in the SPM.

The optical probe on the basis of the crystal includes a crystal resonator 1 with the first and second shoulders 2 and 3, and the flange 4, mounted on the base 5. The optical fiber 6, the tip 7 is fixed on the base 5 at an angleto the shoulder 2. The flange 4 of the quartz resonator can be mounted in the base 5 using glue, landing with tightness, etc., the mounting Device 8 of the optical fiber 6 can include a flange 9 that is installed with the possibility of shifts in the X, Y coordinates in the gaps 10 and fixed by screws 11. In addition, the mounting device 8 may include a ball bearing 12 and the plate 13, secured to the flange 9 by screws 14. The purpose of the axial fixing of the optical fiber 6 relative to the ball support 12 she (Karavanova quartz resonator also includes a clamp 15 with capture 16, performed, for example, in the form of a groove mounted on the base 5 by means of a screw 17 with the possibility of progress on it. Slip the clamp 15 in the X, Y plane can be accomplished by turning the clamp 15 around the axis O-O' and slip in the gap 18. Slip clamp 15 on the Z coordinate can be carried out using, for example, the spring element 19, or set of washers (not shown) installed in place of the spring element 19. On the base 5 is also fixed to the vibration source 20, is made in the form of a piezoelectric plate 21 with the electrodes 22 and insulators 23.

It is also possible a simpler embodiment of the fastening device 8 consisting, for example, of the two plates 24 and 25 (Fig.2) made of Teflon or other plastic material and is fixed relative to the housing 26 of the retainer plate 27. The tilt angle may be exercised by the screws 28 and 29.

There are more complex and more robust embodiment of the clamp in which the possibility of progress carried out by using the first strap 30 (Fig.3) installed on the base 5 by means of a screw 31 can be rotated and moved in the plane perpendicular to the optical fiber 6, for example in the gap 32 is 36, capture 37 and opening 38. On the first strap 30 is also fixed reference point 39 with the stop 40. The hole 38 should be such that it was possible the rise and setting of the stop 10 of the strap 34. However, gaps in the hole should provide a reliable fixing of the fiber 6. For example, the gap of the Y-coordinate should not cause slippage of the fiber 6 with the shoulder 2.

The grip 16 of the clamp 15 may have a rectangular cross section with width B (Fig. 4), is equal to the diameter of the optical fiber d, and height, the smaller the diameter d of the optical fiber. The length D (Fig.3) capture exceeds the diameter d of the fiber 6.

The optical probe on the basis of the quartz resonator is designed for use in a scanning probe microscope, which contains the platform 41 (Fig.5) with the supply device 42 and piezoscanner 43, through the holder 44 is fixed to the object 45.

On the platform 41 is set as the base 5 with the optical fiber 6, the mounting device 8, the clamp 15 and the vibration source 20. Fiber 6 may be associated with the unit of analysis of the optical information 46 (e.g., a photomultiplier). The object 45 may be connected through the mirror 47 to the light source 48 (e.g., laser).

It should be noted that foundations can be installed on the table 49 piezoscanner 43. The object 45, however, is mounted on the platform 50. In this case, the mounting device 8 in order to simplify the configuration can be set based on the 5-side of the quartz resonator 1 between the clamp 15 and the base 5.

There is also a variant in which the illuminated object through the fiber 6 and the removal of information - through the mirror 47, joined with the block 46.

Elements 1, 20, 42, 43 and 44 in both cases connected to the control unit 51.

The device operates as follows. Installing the optical fiber 6 in a ball bearing 12. It should be noted that the fiber 6 can be fastened to the pole 12, and set free, for example, on a sliding fit. Immobility its Z coordinate when the work will be provided with friction forces at the bend of the fiber 6. Using the flange 8 and the support 12, install fiber 6 at an angleto the shoulder 2. The anglechoose from the following considerations. Increasing the angleallows greater range to adjust the contact pressure of the fiber 6 to the shoulder 3. On the other hand, this increases the probability of breaking the fiber 6. That is, for each individual fiber is selected a best angle

Fixing fiber 6 according to Fig.3 is as follows. Using the movement of the first slat 30, Orient the gripper 37 opposite the first shoulder 2 of the quartz resonator. Raise the second bar 34 by screws 35, install fiber 6 in the grip 37 and fix it on the first shoulder 2.

More fully using a probe comprising a scanning probe microscope can be found in the following sources[3, 4, 5, 6].

The use of the clamp with grip mounted on the base with the opportunity to interact with the optical fiber fixed to the base at an angle to the shoulder of the crystal increases the q of the crystal and its sensitivity, and improves the reliability of its use.

Install the clamp on the base with the possibility of movement relative to the shoulder of the crystal leads to the following results.

Slip on the X-axis allows for more accurate sorientirov what about the Y-axis allows you to change the contact pressure of the fiber to the resonator, that allows you to choose the optimum contact pressure from the point of view of security of attachment and acceptable quality.

Motion along the Z axis allows you to choose for each fiber, the optimum length for maximum q-factor and, accordingly, sensitivity.

Fixing the optical fiber on the base at an angle to the first shoulder of the crystal allows the use of the spring properties of the fiber to secure that improves the quality and sensitivity of the device, and the ability to change the angle allows you to choose its optimal value.

Using the first and second strips simplifies the process of installing the optical fiber and the reliability of its fastening.

The capture is in the form of a groove with a rectangular cross section and a length greater than the diameter of the fiber increases the reliability of its fixing. The groove width B equal to the diameter d of the fiber, restricts the movement of the fiber, leading to sliding off his shoulder resonator, and improves the reliability of the fastening.

Sources of information 1. The UK patent GB 2289759, H 01 J 37/28, 1995.

2. Patent EP 0864899, G 02 B 21/00, 1998.

3. Probe microscopy for biology and medicine. C. A. Bykov and other Sensory systems, so 12, 1, 1998, S. 99-121.

5. Scanning tunneling microscopy. B. C. Edelman. PTE 5, 1989, S. 25-49.

6. Patent EP 0791802, G 01 B 7/34, 1996.

Claims

1. The optical probe on the basis of the quartz resonator for a scanning probe microscope, containing quartz resonator and the source of vibrations, is fixed on the base, and an optical fiber mounted on a first arm of the quartz resonator by means of a clamp, wherein the clamp includes capture and installed on the base with the possibility of movement of the grip relative to the first shoulder of the quartz resonator, and the optical fiber is fixed on the base and located at an angle to the first shoulder of the crystal with the ability to change the angle.

2. Optical probe for p. 1, characterized in that the possibility of progress clamp carried out by running it in the form of a first strap that is installed on the base can be rotated and moved in the plane perpendicular to the optical fiber, and a second strap mounted on the first strap with a possibility of rotation relative to it in a plane parallel to the optical fiber and can be locked in relation to it.

3. Optical socoho fiber, height is less than the diameter of the optical fiber, and the length is larger than the diameter of the optical fiber.

 

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