data = [0.35737704918032787, 92649850.48039015
0.3819672131147541, 72475211.53588514
0.41147540983606556, 55967196.301264346
0.4229508196721312, 51126728.207795605
0.4557377049180328, 47937263.23846833
0.5016393442622952, 43803474.996365294
0.539344262295082, 40544606.59504045
0.5688524590163934, 34277014.89316264
0.5950819672131147, 25461360.619704828
0.6229508196721312, 16618285.037019765
0.6655737704918033, 10037712.197086804
0.7213114754098361, 6724703.556947659
0.7950819672131147, 4169337.0144349397
0.8836065573770491, 2722604.5977291227
0.9557377049180328, 1997130.2156342946
1.0344262295081967, 1523018.3932672704
1.1049180327868853, 1255113.4937515096
1.1852459016393442, 1034416.372625131
1.2737704918032788, 886319.8712540427
1.359016393442623, 779309.6059234422
1.4540983606557378, 609961.3425615291
1.4918032786885247, 502533.5248888627
1.5098360655737708, 398203.214420678
1.5196721311475412, 299601.3683763488
1.5213114754098362, 195504.2893801002
1.5262295081967214, 119588.7737216253
1.5360655737704918, 65114.84416472715
1.5475409836065577, 38316.26954492593
1.5508196721311474, 25329.082065449114
1.559016393442623, 18331.533361062826
1.5688524590163935, 14713.897024069562
1.5934426229508198, 11361.99263934681
1.6196721311475408, 8773.786275376307
1.6508196721311474, 6433.761487810411
1.6754098360655738, 5032.800618487584
1.7049180327868854, 3787.196421050415
1.7327868852459019, 2886.942647505133
1.7557377049180327, 2287.679320744783
1.777049180327869, 1933.9100405245356];
fig = figure();
ax = axes();
hold(ax);
ax.YAxis.Scale = 'log';
xlabel(ax, 'Wavelength ($\mu$m)', 'Interpreter', 'latex', 'FontSize', 14);
ylabel(ax, '$\alpha$ ($m^{-1}$)', 'Interpreter', 'latex', 'FontSize', 14);
ax_top = axes();
hold(ax_top);
ax_top.XAxisLocation = 'top';
ax_top.YAxisLocation = "right";
ax_top.YTick = [];
ax_top.Color = 'none';
xlabel(ax_top, 'Energy($e$V)', 'Interpreter', 'latex', 'FontSize', 14);
linkprop([ax, ax_top],{'Units','Position','ActivePositionProperty'});
ax.Position(4) = ax.Position(4) * .96;
h = 4.135e-15;
c = 3e8;
lambda = linspace(0.2,1.8,9);
E = h*c./lambda*10^6;
ax.XLim = [lambda(1) lambda(end)];
ax.XTick = lambda;
ax.XAxis.TickLength = [0.015, 0.00];
ax.YAxis.TickLength = [0.02, 0.00];
ax.XAxis.MinorTick = 'on';
ax.XAxis.MinorTickValues = linspace(0.2,1.8,17);
y_ticks = [0.7 0.8 0.9 1 2 3 4 5];
lambda_y_tick = h*c./y_ticks*10^6;
ax_top.XLim = [lambda(1) lambda(end)];
ax_top.XTick = fliplr(lambda_y_tick);
ax_top.XTickLabel = compose('%1.1f', fliplr(y_ticks));
ax_top.XAxis.TickLength = [0.02, 0.00];
ax_top.XAxis.MinorTick = 'off';
plot(ax, data(:,1), data(:,2), 'r-', 'LineWidth', 3);
Best Answer