How can I extract data from a specific location?
The scanning tunneling microscope tip is moved to obtain the tunneling current z. The tip is scanned with raster scanning (triangular wave-like behavior) + dither circular motion behavior.
This tunneling current z is then scanned for the time interval Δtm=N(1/fm+j/fm)(N=0, 1, 2, ….. , j=0, 1, 2, 3, 4, 5), we want to extract and draw. j=0, 1, 2, 3, 4, 5 represent the 6 equal positions of the dither circumference. These 6 points are points A, B, C, D, E, and F, which are 210, 330, 90, 30, 150, and 270° of the dither circle, respectively.
How can I extract each tunnel current at each point?
Attached below are images of raster scanning and dither circular motion.
%Parameter Setting
pixel_image = 256; %Input the number of pixels in the image obtained by raster scanning (input 2^n)
dr = 1/(2*sqrt(3)); %Enter dither circle radius [grid].
a_fast_grid = 10; %fast axis scanning range [grid]
a_slow_grid = 10; %Slow axis scanning range [grid]
fm=5000; %Dither circle modulation frequency [Hz]
fs= fm*240 ; %Sampling frequency [Hz]
f_fast = 10.2; %Input scanning frequency [Hz] (1 line scanning count in 1[s])
start_point_x = 0; %Input x-coordinate of scanning start point (input 1 if you want to move by 1[grid])
start_point_y = 0; %Input y-coordinate of scanning start point (input 1 if you want to move by 1[grid])
%Parameter setting for fast-axis triangular wave
amplitude_fast = a_fast_grid/2; %fast axis amplitude
%Parameter setting for slow-axis triangular wave
amplitude_slow = a_slow_grid/2; %slow axis amplitude
f_slow = (f_fast)/(2*pixel_image); %Slow axis triangular wave frequency
% Generation of time vectors
total_time=256/f_fast; %Total Scan Time
t = linspace(0, total_time, fs * total_time);
x_raster = start_point_x + amplitude_fast*(2/pi)*acos(cos(2*pi*f_fast*t));
y_raster = start_point_y + amplitude_slow*(2/pi)*acos(cos(2*pi*f_slow*t));
x_dither = dr*cos(2*pi*fm*t);
y_dither = dr*sin(2*pi*fm*t);
x = x_raster + x_dither;
y = y_raster + y_dither;
z1 = cos(2*pi*((x-y)/(sqrt(3))));
z2 = cos(2*pi*(2*y/(sqrt(3))));
z3 = cos(2*pi*((x+y)/(sqrt(3))));
z = (z1 + z2 + z3);
% Plotting Raster Scanning
figure;
plot(x_raster, y_raster, ‘b.-‘);
title(‘Raster Scanning’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
% Dither circle plot
figure;
plot(x_dither, y_dither, ‘b.-‘);
title(‘dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
%Raster Scanning + dither circle scanning Plot
figure;
plot(x, y, ‘b.-‘);
title(‘Raster scanning + dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;The scanning tunneling microscope tip is moved to obtain the tunneling current z. The tip is scanned with raster scanning (triangular wave-like behavior) + dither circular motion behavior.
This tunneling current z is then scanned for the time interval Δtm=N(1/fm+j/fm)(N=0, 1, 2, ….. , j=0, 1, 2, 3, 4, 5), we want to extract and draw. j=0, 1, 2, 3, 4, 5 represent the 6 equal positions of the dither circumference. These 6 points are points A, B, C, D, E, and F, which are 210, 330, 90, 30, 150, and 270° of the dither circle, respectively.
How can I extract each tunnel current at each point?
Attached below are images of raster scanning and dither circular motion.
%Parameter Setting
pixel_image = 256; %Input the number of pixels in the image obtained by raster scanning (input 2^n)
dr = 1/(2*sqrt(3)); %Enter dither circle radius [grid].
a_fast_grid = 10; %fast axis scanning range [grid]
a_slow_grid = 10; %Slow axis scanning range [grid]
fm=5000; %Dither circle modulation frequency [Hz]
fs= fm*240 ; %Sampling frequency [Hz]
f_fast = 10.2; %Input scanning frequency [Hz] (1 line scanning count in 1[s])
start_point_x = 0; %Input x-coordinate of scanning start point (input 1 if you want to move by 1[grid])
start_point_y = 0; %Input y-coordinate of scanning start point (input 1 if you want to move by 1[grid])
%Parameter setting for fast-axis triangular wave
amplitude_fast = a_fast_grid/2; %fast axis amplitude
%Parameter setting for slow-axis triangular wave
amplitude_slow = a_slow_grid/2; %slow axis amplitude
f_slow = (f_fast)/(2*pixel_image); %Slow axis triangular wave frequency
% Generation of time vectors
total_time=256/f_fast; %Total Scan Time
t = linspace(0, total_time, fs * total_time);
x_raster = start_point_x + amplitude_fast*(2/pi)*acos(cos(2*pi*f_fast*t));
y_raster = start_point_y + amplitude_slow*(2/pi)*acos(cos(2*pi*f_slow*t));
x_dither = dr*cos(2*pi*fm*t);
y_dither = dr*sin(2*pi*fm*t);
x = x_raster + x_dither;
y = y_raster + y_dither;
z1 = cos(2*pi*((x-y)/(sqrt(3))));
z2 = cos(2*pi*(2*y/(sqrt(3))));
z3 = cos(2*pi*((x+y)/(sqrt(3))));
z = (z1 + z2 + z3);
% Plotting Raster Scanning
figure;
plot(x_raster, y_raster, ‘b.-‘);
title(‘Raster Scanning’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
% Dither circle plot
figure;
plot(x_dither, y_dither, ‘b.-‘);
title(‘dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
%Raster Scanning + dither circle scanning Plot
figure;
plot(x, y, ‘b.-‘);
title(‘Raster scanning + dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on; The scanning tunneling microscope tip is moved to obtain the tunneling current z. The tip is scanned with raster scanning (triangular wave-like behavior) + dither circular motion behavior.
This tunneling current z is then scanned for the time interval Δtm=N(1/fm+j/fm)(N=0, 1, 2, ….. , j=0, 1, 2, 3, 4, 5), we want to extract and draw. j=0, 1, 2, 3, 4, 5 represent the 6 equal positions of the dither circumference. These 6 points are points A, B, C, D, E, and F, which are 210, 330, 90, 30, 150, and 270° of the dither circle, respectively.
How can I extract each tunnel current at each point?
Attached below are images of raster scanning and dither circular motion.
%Parameter Setting
pixel_image = 256; %Input the number of pixels in the image obtained by raster scanning (input 2^n)
dr = 1/(2*sqrt(3)); %Enter dither circle radius [grid].
a_fast_grid = 10; %fast axis scanning range [grid]
a_slow_grid = 10; %Slow axis scanning range [grid]
fm=5000; %Dither circle modulation frequency [Hz]
fs= fm*240 ; %Sampling frequency [Hz]
f_fast = 10.2; %Input scanning frequency [Hz] (1 line scanning count in 1[s])
start_point_x = 0; %Input x-coordinate of scanning start point (input 1 if you want to move by 1[grid])
start_point_y = 0; %Input y-coordinate of scanning start point (input 1 if you want to move by 1[grid])
%Parameter setting for fast-axis triangular wave
amplitude_fast = a_fast_grid/2; %fast axis amplitude
%Parameter setting for slow-axis triangular wave
amplitude_slow = a_slow_grid/2; %slow axis amplitude
f_slow = (f_fast)/(2*pixel_image); %Slow axis triangular wave frequency
% Generation of time vectors
total_time=256/f_fast; %Total Scan Time
t = linspace(0, total_time, fs * total_time);
x_raster = start_point_x + amplitude_fast*(2/pi)*acos(cos(2*pi*f_fast*t));
y_raster = start_point_y + amplitude_slow*(2/pi)*acos(cos(2*pi*f_slow*t));
x_dither = dr*cos(2*pi*fm*t);
y_dither = dr*sin(2*pi*fm*t);
x = x_raster + x_dither;
y = y_raster + y_dither;
z1 = cos(2*pi*((x-y)/(sqrt(3))));
z2 = cos(2*pi*(2*y/(sqrt(3))));
z3 = cos(2*pi*((x+y)/(sqrt(3))));
z = (z1 + z2 + z3);
% Plotting Raster Scanning
figure;
plot(x_raster, y_raster, ‘b.-‘);
title(‘Raster Scanning’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
% Dither circle plot
figure;
plot(x_dither, y_dither, ‘b.-‘);
title(‘dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on;
%Raster Scanning + dither circle scanning Plot
figure;
plot(x, y, ‘b.-‘);
title(‘Raster scanning + dither circle scanning locus’);
xlabel(‘x coordinate’);
ylabel(‘y coordinate’);
axis equal;
grid on; signal processing, image, matlab MATLAB Answers — New Questions
